1. Chemistry

    A 1.50 L buffer solution is 0.250 mol L-1 in HF and 0.250 mol L-1 in NaF. Calculate the pH of the solution after the addition of 0.0500 moles of solid NaOH. Assume no volume change upon the addition of the base. The Ka for HF is 3.5 × 10-4. Thanks in

    asked by B on June 21, 2015
  2. Chemistry

    Phthalic acid, H2C8H404, is a diprotic acid used in the synthesis of phenolphthalein indicator. Ka1= 1.2x 10^-3, and Ka2 = 3.9 x 10^-6. a) Calculate the hydrongen-ion concentration of a .015 M solution. b) What is the concentration of the C8H4O4^2- ion in

    asked by Crystal on November 29, 2016
  3. Chemistry

    1. WHy is KHC8H4O4 used as the acid in standardization titration? 2. Why should you not shake KHC8H4O4 (Acidic solution) before titrating it with NaOH (Basic solution)? 3. Why is boiled distilled waster used to prepare acidic and basic solutions? Any and

    asked by Grade 12 on February 1, 2009
  4. Grade 11 Chemistry!

    10% (m/m) sodium hydroxide solution, NaOH, is used to break down wood fibre to make paper. a) What mass of solute is needed to make 250mL of 10% (m/m) solution? b) What mass of solvent is needed? c) What is the molare concentration?

    asked by Kairi on December 10, 2008
  5. Chemistry

    queston: the pH of a white vinegar solution is 2.45. this vinager is an aquous solution of acetic acid with a density of 1.09g/mL. What is the mass percentage of acetic acid in the soulution. What exactly do i have to do? do i set up an Ice table. What do

    asked by Anonymous on April 15, 2009
  6. Chemistry

    If 33.6 grams of KCl are dissolved in 192 grams of water, what is the concentration of the solution in percent by mass? AND if 2.1 moles of CaCl2 are dissolved in enough water to make a .92 liter solution what is the resulting molarity? Please help and

    asked by Dr. David on March 27, 2012
  7. algebra

    1.Write a quadratic equation in the variable x having the given numbers as solutions. Type the equation in stadard form ax^2+bx+c=0 Solution 7, only solution 2.The width of a rectangle is less than the length. The area is 4ft^3. Find the length and the

    asked by lisa on December 17, 2011
  8. chem

    A solution is prepared by dissolving 25 grams of sodium sulfate in enough water to give a total volume of 500. mL. The molar mass of sodium sulfate is 142 grams per mole. What is the molarity of the solution?

    asked by jennifer on November 14, 2012
  9. chemistry

    You wish to prepare 100.0 mL of a 800.0 ppm w/v sodium (MW = 22.9897 g/mol) solution. How many grams of sodium dichromate dihydrate (Na2Cr2O7·2H2O, MW = 297.998 g/mol) are needed to prepare this solution?

    asked by Chase on January 26, 2015
  10. Chemistry 1

    How many grams of a stock solution that is 92.5 percent H2SO4 by mass would be needed to make 250 grams of a 35.0 percent by mass solution? Can you please teach me how to do this? I get the other stoichiometry stuff, but this one tripped me up because I

    asked by Brittany on February 1, 2011
  11. Gen Chem

    A mixture of NaCl and sucrose (C12H22O11) of combined mass 10.2 g is dissolved in enough water to make up a 250 mL solution. The osmotic pressure of the solution is 8.29 atm at 23°C. Calculate the mass percent of NaCl in the mixture.

    asked by Brittany on February 4, 2016
  12. math

    The graph represents the cost cc (in dollars) of buying nn tickets to a baseball game. (1,10) (2,20) (3,30) a. Should the points be connected with a line to show all the solutions? Explain your reasoning. make sense to draw a line between the points to

    asked by mckenzie on April 1, 2017
  13. Chemistry

    Is it possible to separate platinum, palladium, and iridium as chloro-complex ions from an HCl solution through electrolysis if the solution is a constant 1.0 molarity in chloride ions and 0.020 molarity in each complex ion?

    asked by Jeff on December 23, 2018
  14. chemistry (Pls Bob check for me)

    A 150 mg/dl glucose solution was diluted 1:2. Then 0.5ml of it was added to 4.5ml saline 2 ml of this solution was diluted to 10ml. What is the final concentration of glucose? 1L= 10dl 1dl =100mL Answer 0.015mg/dl

    asked by Fai on March 16, 2013
  15. Chemistry

    -A sample consist 90% NaOH and 10% CaO,whats the concentration of NaOH in the solution of this 3g sample,dissolved in 250cm3. -How many cm3 of H2SO4 with concentration of 0.255M are needed for titration of 100cm3 of this solution

    asked by plsHelp on September 4, 2013
  16. cheMYSTERY

    A 20.00 mL of 0.200mol/L magnesium chloride solution is added to a 95.00 mL of 0.800 silver (I) nitrate solution,Determine the concetration of the silver ions at the end of the reaction and the magnesium ions. and a precipitate is formed.

    asked by sandeep singh on April 22, 2014
  17. Chemistry

    0.000333 g fluorescein (332.32 g/mol) is dissolved in 225 mL solution of ethanol. The density of ethanol is 0.785 g/mL. What is the concentration of the solution in molarity (M)? How many ppm? I already know that the molarity is 4.45E-6. I just need help

    asked by Vince on July 16, 2012
  18. Chemistry

    When 50.0mL of 0.100M NH3 (Kb=1.8x10^-5) solution is mixed with 20.0mL of of 0.250M HCl solution, what is the pH after reaction? I solved the ka=5.56x10^-10 and I solved the moles of each nHCl and nNH3 and both have 0.005 moles. What do I do after this?

    asked by Kearstyn on February 15, 2009
  19. Chemistry

    When 50.0mL of 0.100M NH3 (Kb=1.8x10^-5) solution is mixed with 20.0mL of of 0.250M HCl solution, what is the pH after reaction? I solved the ka=5.56x10^-10 and I solved the moles of each nHCl and nNH3 and both have 0.005 moles. What do I do after this?

    asked by Kearstyn on February 15, 2009
  20. chemistry

    Calculate the approximate pH of a 0.1 M solution of ethanoic acid at 298 K, given that the dissociation constant, Ka, is 1.75 x 10-5 mol/L at 298 K.Ethanoic acid dissociates in aqueous solution as follows: CH3COOH(aq) + H2O H3O+(aq) + CH3COO-(aq)

    asked by Emily on April 28, 2015
  21. Chemistry

    A 1N solution of NaOH is diluted 4/20 then rediluted 1:50. What is the final normality? How many grams of NaOH are present in 100ml of the final solution? I sort of understand the basic concept, but I don't really know how to do normality problems.

    asked by Jennie on May 20, 2014
  22. Chemistry

    I've a solution 0.002M of Pb(NO3)2: What is the minimum concentration of iodide ions (I-) necessary to observe the precipitation of PbI2? What mass of KI should be added to observe the precipitation of PbI2 from the 25 mL volume lead nitrate solution?

    asked by sauro on January 19, 2019
  23. CHEMISTRY

    Before investigating the scene, the technician must dilute the luminol solution to a concentration of 4.00×10−2 . The diluted solution is then placed in a spray bottle for application on the desired surfaces. How many moles of luminol are present in

    asked by STEVE on September 28, 2009
  24. chemistry

    A graduated cylinder was used to transfer 201 mL of a 0.478 M solution of KCl to a beaker which was subsequently diluted to a final volume of 1.092 L. What is the final molarity of the KCl in the beaker after the solution is thoroughly mixed?

    asked by Alex on February 8, 2012
  25. chem

    what precautions should be observed when an aqueous sodium carbonate solution is used to extract an organic solution containing traces of acid? is it that aqueous sodium carbonate is extremely combustible, which can't be exposed to an open flame?

    asked by Jason on October 28, 2008
  26. chEMISTRY

    Before investigating the scene, the technician must dilute the luminol solution to a concentration of 4.00×10−2M . The diluted solution is then placed in a spray bottle for application on the desired surfaces. How many moles of luminol are present in

    asked by LIO on October 25, 2014
  27. chemistry

    use the Henderson-Hasselbalch equation to calculate the pH of a buffer solution prepared by mixing equal volumes of 0.20 M NaHCO3 and 0.10M Na2CO3.(Ka=5.6x10^-11). how would you prepare NaHCO3-Na2CO3 buffer solution that has the pH of 10.40.

    asked by abc on February 28, 2014
  28. Chemistry!

    Before investigating the scene, the technician must dilute the luminol solution to a concentration of 6.00×10−2 M. The diluted solution is then placed in a spray bottle for application on the desired surfaces. How many moles of luminol are present in

    asked by Gabe on March 28, 2012
  29. chem

    what precautions should be observed when an aqueous sodium carbonate solution is used to extract an organic solution containing traces of acid? is it that aqueous sodium carbonate is extremely combustible, which can't be exposed to an open flame?

    asked by Jason on October 28, 2008
  30. Chemistry-Dr.Bob222

    A 1.00 L buffer solution is 0.250 M in HC2H3O2 and 0.250 M in NaC2H3O2. Calculate the pH of the solution after the addition of 0.150 mol of solid NaOH. Assume no volume change upon the Additon o f NaOH. The Ka value for HC2H3O2 at 25 C is 1.8 x 10^-5.

    asked by Nevaeh on April 29, 2016
  31. physics :thinking check please

    I think that: psi= A sin kx; is a solution to Schrodinger's time independent eqn for a particle confined: a) within an infinite pot well, and b) within the walls of a finite well;but psi= B exp(-kx) would only be a solution for outside the walls of a

    asked by charlie on April 30, 2009
  32. Chemistry

    A 11.0-mL sample of an unknown H3PO4 solution requires 116mL of 0.140 KOH to completely react with the H3PO4. What was the concentration of the unknown H3PO4 solution (answer in M). H3PO4(aq) + 3KOH(aq) --> 3H2O(l) + K3PO4(aq)

    asked by April on July 23, 2014
  33. ap chemistry

    When 50.0 mL of a 0.010 M CuNO3 solution is mixed with 150.0 mL of a 0.010 M NaCl solution, a precipitate forms (Ksp = 1.9 x 10^-7). a) Determine all final ion concentrations b) Determine the mass of the precipitate formed. How do i do this?

    asked by alex on March 28, 2012
  34. statistics and probability

    When a die is rolled and a coin(with heads and tails) is tossed,find the probability of obtaining, (a). Tails and an even number. solution. A={HH,TT,HT,HT} B={HH,TH} (b). A number greater than 3 SOLUTION. let event C=(AuB) P(C)=P(AuB)=P(A)+P(B)-P(AnB) =3/4

    asked by masinde on December 3, 2015
  35. Chemistry

    Before investigating the scene, the technician must dilute the luminol solution to a concentration of 4.00×10−2 . The diluted solution is then placed in a spray bottle for application on the desired surfaces. How many moles of luminol are present in

    asked by boston on October 13, 2009
  36. Chemistry

    Before investigating the scene, the technician must dilute the luminol solution to a concentration of 4.00×10−2 . The diluted solution is then placed in a spray bottle for application on the desired surfaces. How many moles of luminol are present in

    asked by boston on October 13, 2009
  37. chemistry

    1. describe in outline a suitable procedure for the preparation of saturated solution of sodium nitrate at 30 degree celsius 2. State 2 techniques that can be used to recover crystals of the sodium nitrate from its saturated solution

    asked by peter on January 8, 2014
  38. AP Physics B (Heat Engines)

    18. (II) At a steam power plant, steam engines work in pairs, the heat output of the first one being the approximate ehat input of the second. Th eoperating temeprautres of the first are 680 degrees C and 430 degrees C, and of the second 415 degrees C and

    asked by Joe on December 16, 2009
  39. Chemistry!

    When 2.5g of NaOH were dissolved in 49.0g water in a calorimeter at 24.0 C, the temperature of the solution went up to 37.1 C. a. Is the solution reaction exothermic? Why? The temperature or the water went from 24.0 to 37.1 which is an increase. If the

    asked by DrBob222 on December 4, 2006
  40. Math

    1. When would the following conditional be false? If you work 20 hours a week, then you make 125.00. A) You work 25 hours a week, and make 125.00. B) You work 25 hours a week, and you make 175.00. C) You work 20 hours a week, and you make 175.00. D) You

    asked by Tim on January 31, 2016
  41. Math

    1. When would the following conditional be false? If you work 20 hours a week, then you make 125.00. A) You work 25 hours a week, and make 125.00. B) You work 25 hours a week, and you make 175.00. C) You work 20 hours a week, and you make 175.00. D) You

    asked by Tim on January 30, 2016
  42. chemistry

    Explain how you would prepare a saturated aqueous solution of table sugar. Heat the solution to near its boiling point. With stirring, add table sugar to water. Keep adding sugar until no more dissolves. Allow the solution to cool. With stirring, add table

    asked by krystal on February 24, 2012
  43. college chemistry

    Pentane, C5H12, and hexane, C6H14, combine to form an ideal solution. At 25⁰C the vapor pressure of pentane is 511 torr and that of hexane is 150 torr. In the vapor over a pentane-hexane solution at 25⁰C, the mole fraction of pentane is 0.15. What is

    asked by Stephanie on April 28, 2010
  44. chemistry

    Copper can be determined gravimetrically by precipitation as copper(I)thiocyanate, CuSCN. A wrought aluminum-copper sample(4.5167 g) was dissolved in a minimum amount of concentrated HCl followd by the additon of 25 ml of sulfurous acid to reduced the

    asked by WILL on December 22, 2012
  45. english

    oh i forgot to put in my original draft, which i also forgot to say it was a rough draft. my rough draft needs to have multiparagraph, insights, transitions, and that i wrote a narrative. rough draft: choices An incident from my circle map is when I chose

    asked by anon on September 7, 2015
  46. physics

    A small particle of mass 2.0 x 10^-19 kg is attached to a string of relaxed length 0.50 nm .The string is the black horizontal line attached to a an immovable wall on the left. The plot is a graph of the force needed to stretch the string by pulling to the

    asked by maggie on November 21, 2009
  47. ap chemistry

    What is the ratio of the molarities of PO3^4- and HPO4^2− ions in a buffer solution having a pH of 13.16? What mass of K3PO4 must be added to 1 L of 0.1 M K2HPO4(aq) to prepare a buffer solution with a pH of 13.16? Answer in units of g What mass of

    asked by gabriella on February 4, 2014
  48. Substitution Method!PLZ HELP 2222!!

    y-2x=-5 3y-x=5 In the top equation: 1) y=2x -5 Put that in the second equation 3( ) -x =5 solve for x, then put that value of x back in to 1) to solve for y. So would it be: 3(2x-5)=5? would it?PLz help me bob and margie!

    asked by Matthew on November 5, 2006
  49. calculus

    Solve for x: S(0 to x) (t^3-2t+3)dt=4 I got a different answer from the back of the book. The back of the book said that x=1.63052 or x=3.09131. How am I suppose to solve this using a calculator?

    asked by Anonymous on October 26, 2007
  50. math

    How can I solve the diagonal of a cube with a formula of s square root of 3, if the given is csc x = 2 ? how will i solve for the side of the cube to get its diagonal?

    asked by Ammiel on March 1, 2015
  51. Chemistry

    The pH of a solution is 1. Which of the following statements are also true for the solution? (Select all that apply.) It will change the color of red litmus to blue. The concentration of hydronium ion is equal to the concentration of hydroxide ion. The

    asked by Cody on May 18, 2012
  52. connexus

    think about the work you completed in your reading character role.determine the ideas that would be most worthy to share in a literary discussion about dragonwings.provide an explanation for your choices how did the role you selected and the work you

    asked by pls help on May 17, 2017
  53. Chem/Physics

    1. How much work is necessary to accelerate a bullet having a mass of 5.0 g to a velocity of 1000. m/sec? This was on a chemistry problem set of mine, and it seems like a very physics-oriented question [I have not taken physics.] Could someone point me in

    asked by Jess on February 3, 2007
  54. physics

    A Carnot engine, operating between hot and cold reservoirs whose temperatures are 800.0 and 400.0 K, respectively, performs a certain amount of work W1. The temperature of the cold reservoir is then lowered to 200.0 K (see the drawing), and the work done

    asked by Aryiana on December 1, 2011
  55. Laungauge

    Think about the work you completed in your reading role. Determined the ideas that would be most worthy to share in a literary discussion about Walk Two Moons. Provide and explanation for your choices. How did the role you selected and the work you

    asked by helpplease on May 11, 2016
  56. Bio

    One way to determine the concentration of protein in a solution is to perform a "protein assay". There are several assay kits on the market that one can use, but they all rely on the common paradigm that the aromatic amino acid residues of a protein

    asked by Josh on June 17, 2006
  57. Health

    An accident chain always contains the 1:problem 2:unsafe action 3:solution 4:witnesses I think it is #3 solution..is this correct? A common emergency is 1:shock 2:choking 3:cardiac arrest 4:ankle sprain I pick #4 ankle sprain..Is this correct?

    asked by Marylyn on May 19, 2015
  58. chem!

    A 2.80 mol/L solution of iron (II) dichromate is combined with 5.00L of a 2.25 mol/L acidic solution of tin (II) bromide. Calculate the volume of iron (II) dichromate required. FeCr2O7 + SnBr2 --> SnCr2O7 + FeBr2 Is this the right formula? or no?

    asked by Mistra on May 16, 2007
  59. Chemistry

    Compound Z has a MW of 100. Your lab partner weighed 25 grams of compound Z and dissolved it in water to a final volume of 1 liter. a) What is the concentration of the solution expressed as a percentage by weight (w/v)? b) What is the concentration of the

    asked by Ty on August 29, 2011
  60. Math 7th Grade

    A car cost $65 per day to rent plus $.35 per mile. Joe rents car for 1 day and drives 115 miles. what is the equation and the solution. The solution is pretty simple $65 + .35x115 = 105.25 I can't figure out the equation.

    asked by Chris on March 12, 2012
  61. Chemistry

    When sulfuric acid reacts with ammonia solution an ammonium salt and water are produced. Calculate the volume of 3mol/dm3 of acid required to react exactly with 25ml of a 2.5mol/dm3 of ammonia solution.

    asked by Jeconiah on June 5, 2012
  62. chemistry

    A is a solution of tetraoxosulphate (vi) acid, B is a solution containing 1.4g of potassium hydroxide per 250cm3. using the table above as the value for your titration and 25cm3 for the value of pipette used 1. concentration of B in mol/dm3 2.

    asked by poppy👌🤔 on May 5, 2019
  63. Chem question Redox Stoichiometry

    A 2.80 mol/L solution of iron (II) dichromate is combined with 5.00L of a 2.25 mol/L acidic solution of tin (II) bromide. Calculate the volume of iron (II) dichromate required. FeCr2O7 + SnBr2 --> SnCr2O7 + FeBr2 Is this the right formula? or no?

    asked by Mistra on May 16, 2007
  64. Chemistry

    The forensic technician at a crime scene has just prepared a luminol stock solution by adding 11.0 g of luminol into a total volume of 75.0 mL of H2O. What is the molarity of the stock solution of luminol? Luminol has a molecular weight of 177 g/mol.

    asked by Greenlee on July 14, 2017
  65. Chemistry

    A solution of 1.50g of solute dissolved in 25.0 mL of H2O at 25C has a boiling point of 100.95C. What is the molar mass of the solute if it is a nonvolatile non electrolyte and the solution behaves ideally. (d of H2O at 25C=0.997g/mL)?

    asked by Tori on February 12, 2012
  66. ap chemistry

    A voltaic cell made of a Cr electrode in a solution of 1.0 M in Cr 3+ and a gold electrode in a solution that is 1.0 M in Au 3+ . a) Provide the half cell reactions for each of the electrodes. b) Which is the anode and which is the cathode? How did you

    asked by megan on April 17, 2012
  67. Chemistry

    AgNO3+FeCl3 --> AgCl+Fe(NO3)3 In an experiment, it was planned to mix a solution containing 25 g of AgNO3 with another solution containing 45 g of FeCl3. a) What is the maximum number of moles of AgCl that could be obtained? I already found the limiting

    asked by Jamie on March 9, 2012
  68. Chemistry - %v/v

    1. How many mL of acetone are needed to prepare a 10% v/v solution in 500 mL of methanol? 2. If a 500mL solution of n-propanol in water is prepared with 4mL of alcohol, what is the concentration of alcohol in % v/v? I've never worked with %v/v before so

    asked by double checking on June 2, 2013
  69. science

    How many grams of CaO must be added to 50.0 mL of water to make the temperature increase from 25.0 ¡ÆC to 48.81 ¡ÆC? The reaction is CaO(s) + H2O(l) ¡ê Ca(OH)2(aq) -- ¥ÄH = -83.7 kJ Assume the heat capacity of the solution is the same as pure water

    asked by Any on October 25, 2014
  70. Physics

    A collapsible plastic bag contains a glucose solution. If the average gauge pressure in the vein is 1.21 103 Pa, what must be the minimum height h of the bag in order to infuse glucose into the vein? Assume the specific gravity of the solution is 1.03.

    asked by Amelia on November 7, 2012
  71. HTT / 230

    Nance’s Restaurant, a local independent restaurant, is evaluating new point-of-sale (POS) systems and must determine if a new installation is feasible. A new POS installation would include both software and hardware, with a total cost of $20,000.

    asked by becklynn on January 28, 2014
  72. Math

    I'm having a difficult time trying to solve something that should be very easy. I have the following: 40dBm - 6 dB + 10dB - Lprop > -100dBm Now, the answer should be Lprop < -144dB, but I'm getting messed up with the signs. I'm trying to move the -100dBm

    asked by Josh Garder on May 14, 2018
  73. PreCalc (Just Can't Comprehend)

    Find the dimensions of the rectangle with minimum perimeter if its area is 400 square meters. Find the least perimeter. I know that a rectangle has two sides that are equal and two other sides that are equal but I am unsure about what type of equation to

    asked by MUFFY on November 1, 2009
  74. Physics

    Show that the total mechanical energy of a satellite (mass m) orbiting a distance r from the center of the Earth (mass M-e)is: -(1/2)*(G m M-e)/(r if U = 0 at r = infinity. Show that although friction causes the value of E (mechanical energy) to decrease

    asked by Anonymous on March 21, 2008
  75. Physics Help please

    The free-fall acceleration on Mars is 3.7 m/s2. (a) What length pendulum has a period of 4 s on the earth? cm What length pendulum would have a 4 s period on Mars? cm (b) A mass is suspended from a spring with force constant 10 N/m. Find the mass suspended

    asked by Anonymous on December 6, 2010
  76. Chemistry

    40.0 ml of an acetic acid of unknown concentration is titrated with 0.100 M NaOH. After 20.0 mL of the base solution has been added, the pH in the titration flask is 5.10. What was the concentration of the original acetic acid solution? [Ka(CH3COOH) = 1.8

    asked by Kelly on November 9, 2010
  77. Chemistry

    A is a solution of tetraoxosulphate(iv)acid.B contains 3.95g of sodium trioxocarbonate(iv) in 750cm3 of solution.if 22.70cm3 of the tetraoxosulphate(iv)acid neutralized 25.0cm3 of sodiumtrioxocarbonate(iv).calculate the concentration of i) B in moldm-3 ii)

    asked by Yvonne on December 8, 2016
  78. Chemistry

    We have been thought that BaC2O4 is a precipitate when dissolved in H2O. When comparing its solubilty in water and in an aqueous acidic solution,what is the reason for its higher solubility in an aqueous acidic solution than water?

    asked by Shenaya on July 9, 2017
  79. Math

    Sulfuric acid is diluted in water to make new mixtures. In one container, 72 ml of a 14% acid solution and, in another container, 64 ml of a 31$ acid solution. The contents of the containers are mixed together? What's the percentage strength of the acid in

    asked by Alex on May 12, 2018
  80. Chemistry

    the following acid—base neutralization reaction HNO3 (aq)+ KOH (aq) --KNO3(aq) + H2O (I) What is the molarity (M) of an HNO3 solution if 50.0ml is needed to react with 25.0ml of 0.150M KOH solution?

    asked by Tasha on October 20, 2012
  81. Chemistry

    What is the molality of a 0.065M solution of ethyl alcohol in water at 25 degrees Celcius? (Assume the density of the solution at such low conentration is equal to that of water at 25 degrees Celcius, 0.997 g./mL)

    asked by Shai on March 1, 2011
  82. chemistry

    The Ksp for AgI is 8.5 x 10-17. The Ksp for TlI (thallium iodide) is 5.5 x 10-8. A one litre solution contains 0.035 mol L-1 Ag+ ion and Tl+ ion. When TlI begins to precipitate, what percentage of Ag+ remains in the solution?

    asked by Anonymous on May 25, 2019
  83. Chemistry

    determine the vapor pressure lowering at 27 C of a solution of 750g of sucrose, dissolved in 180g of water. The vapor pressure of pure water at 27 C is 26.7 torr. Assume the solution is ideal

    asked by Anonymous on October 11, 2015
  84. Chemistry

    40.0 ml of an acetic acid of unknown concentration is titrated with 0.100 M NaOH. After 20.0 mL of the base solution has been added, the pH in the titration flask is 5.10. What was the concentration of the original acetic acid solution? (Ka(CH3COOH) = 1.8

    asked by Bob on April 10, 2011
  85. Chemistry

    100g of water is added into 10.6M NaOH solution. The diluted NaOH then neutralized completely with H2SO4 . density of NaOH is 1.08g/ml . calculate the mole fraction of NaOH in diluted solution .

    asked by Amy on June 28, 2016
  86. chemistry

    What would be the molarity of solution obtained by mixing equal volumes of 30% by mass H2SO4 (d=1.218 g/mL) and 70% by mass H2SO4 (d=1.610 g/mL). If the resulting solution has density 1.425 g/mL, calculate its molarity

    asked by jaimi on April 17, 2015
  87. Chemistry

    The solubility of sodium selenate is 84 g/100 g of water at 35 oC. If a solution is obtained by dissolving 92 g of sodium selenate in 200 g of water at 35 oC, What do you call this solution? (A) Diluted (B) Saturated (C) Unsaturated (D) supersaturated

    asked by Yeneta on June 6, 2012
  88. chem

    calculate the percent concentration of each of the following solutions 1. 2.78g of NaHCO3 dissolved in enough water to make 200.0ml of solution 2.3.25ml of H2SO4 dissolved in enough water to make 68.0 ml of solution

    asked by SHORNORA on February 16, 2018
  89. Chemistry

    A quantity of 100 mL of .5M of HCl (aq) is mixed with 100 mL of .5M of NaOH (aq) in a constant pressure calorimeter. The initial temperature of the solutions is 22.30 C and the final temperature of the mixed solution is 25.00 C. What is "q" for solution

    asked by Dante on April 8, 2012
  90. Chemistry

    100g of water is added into 10.6M NaOH solution. The diluted NaOH then neutralized completely with H2SO4 . density of NaOH is 1.08g/ml . calculate the mole fraction of NaOH in diluted solution .

    asked by Amy on June 28, 2016
  91. Chemistry

    A solution is made by mixing 37.0 mL of ethanol, C2H6O, and 63.0 mL of water.? Assuming ideal behavior, what is the vapor pressure of the solution at 20 °C? ethanol: 0.789 g/mL 43.9 torr water : 0.998 g/mL 17.5 torr

    asked by Dee on March 2, 2013
  92. Chemistry

    How many milliliters of 0.277 M AgNO3 solution are needed to react completely with 47.1 mL of 0.278 M NaCl solution? How many grams of AgCl will be formed? The reaction is NaCl(aq) + AgNO3(aq) → AgCl(s) + NaNO3(aq)

    asked by Lynn on November 1, 2011
  93. Chemistry

    20.00mL of 0.55M CH3COOH solution is mixed with 9.95mL of 1.0M NaHCO3 solution. The reaction occurring is CH3COOH + NaHCO3 --> CH3CHOO + Na + H2O +CO2. Which is the limiting reagent in this reaction?

    asked by Kate on April 30, 2015
  94. Chemistry

    A solution is made by dissolving 3.5 moles of sodium chloride (NaCl) in 155 grams of water. If the molal boiling point constant for water (Kb) is 0.51 °C/m, what would be the boiling point of this solution?

    asked by Christi on January 14, 2011
  95. Algebra

    A dehydrated patient needs a 3.82% saline IV. Unfortunately, the hospital only has bags of 4% and 3% saline solutions. How many liters of each of these solutions should be mixed together to yield 5 liters of the desired concentration? So far I've come up

    asked by JerryJ on October 11, 2010
  96. chemistry

    Choose the pair of substances that are most likely to form a homogeneous solution. N2O4 and NH4Cl C6H14 and C10H20 LiBr and C5H12 C6H14 and H2O None of the pairs above will form a homogeneous solution.

    asked by reem on February 3, 2016
  97. Science

    1. What term refers to an energy transfer that causes a change in tempeture? Assume that you have just taken a pan of cooies out of the oven and set them on he counter to cool. 2. What term refers to the aveage kinetic energy of the particles of one of the

    asked by honorsclass on January 11, 2009
  98. chemistry

    Using the equipment below, explain how to prepare a 0.00052M HCl solution from a reagent bottle containing 0.13M HCl using only the equipment listed below. Note, you may make multiple dilutions, but you are not allowed to combine volumes. For example, if

    asked by Jill on July 2, 2013
  99. math

    I need help PLEASE ANSWER ALL THE QUESTIONS WITH EXPLANATION. I need to finish this test please thank you. 1.Compare. Use < , = , or >. 11 _____ –7 A. > B. = C. < 2.Which of the following is a true statement? A. │–7│ > │5│ B. │–7│ <

    asked by Street fighter on April 9, 2019
  100. CHEMISTRY

    Suppose that 30.0 mL of 0.20 M C6H5COO(aq) is titrated with 0.30 M KOH(aq). a) What is the initial pH of the 0.20 M C6H5COOH(aq)? b) What is the pH after the addition of 15.0 mL of 0.30 M KOH(aq)? c) What volume of 0.30 M KOH(aq) is required to reach

    asked by Sarah on September 29, 2011

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