1. chemistry

    what volume of a 2.5m stock soltio of acetic acid (HC2H3O2) is required to prepare 100.0 mililiters of a 0.50m acetic acid solution?

    asked by Anonymous on January 23, 2013
  2. College Chemistry

    A 20.0 Ml sample of sulfuric acid is titrated with 25.0 ML of 1.0 M NaOH solution. What is the molarity of the sulfuric acid? H2SO4+ 2NaOH yields Na2SO4 + H2O

    asked by Sa ndra on December 6, 2010
  3. chemistry

    10.0 mL of 0.15M of sulfuric acid is titrated with 0.05M of sodium hydroxide. how many mL of sodium hydroxide solution are required to reach the equivalence point?

    asked by tim on November 17, 2010
  4. Chemistry

    A solution contains 2.2×10−4 M Ag+ and 1.3×10−3 M If NaI is added, will AgI(Ksp=8.3×10−17) or PbI2(Ksp=7.9×10−9) precipitate first? I know the answer to this is AgI Specify the concentration of I− needed to begin precipitation.

    asked by Caitlin on December 3, 2017
  5. Chemistry

    A solution is made by mixing exactly 500 mL of 0.178 M NaOH with exactly 500 mL of 0.100 M CH3COOH. Calculate the equilibrium concentrations of H+, CH3COOH, CH3COO-, OH-, and Na+.

    asked by Martina on May 2, 2011
  6. Chemistry

    determine the pH of a 0.116 M Ba(OH)2 solution at 25 degrees C. i keep getting 13.06 for this answer, but the answer is 13.37 :S what i do is i take the negative log of the concentration which is 0.9355 which is pOH. i know that pH = 14 - pOH so i get pH =

    asked by Anya on December 13, 2012
  7. chemistry

    HCL acid is available as a stock solution with a concentration of 10 mol/L. If you need (9.0*10^-1) L of (2.50*10^0) mol/L hydrochloric acid, approximately how much distilled water will you need to make the dilution?

    asked by Han on April 20, 2014
  8. chemistry

    How many ml of 0.05M kmn04 acidic are diluted to oxidize 2gm of fes04 is diluted solution The answer 52.63 ml I want you step by step clearly explain Thank you for Bob

    asked by Fai on January 27, 2013
  9. mathematics-permutation and combination

    if certain number of boys are arranged evenly cyclical form, the 7th boy is directly opposite the 18th boy . How many boys are there? Please i only need the solution #thanks

    asked by p1 on May 8, 2016
  10. Chemistry 101

    A volume of 20.0 mL of a 0.140 M HNO3 solution is titrated with 0.850 M KOH. Calculate the volume of KOH required to reach the equivalence point.

    asked by Caitlyn on March 9, 2018
  11. chemistry

    Given the equation Ag^+(aq) + 2NH3 (aq) -> [Ag(NH3)2]^+ (aq) kf= 2 x 10^7 determine the concentration of NH3(aq) that is required to dissolve 415 mg of AgCl(s) in 100.0 mL of solution. The Ksp of AgCl is 1.77× 10–10.

    asked by jerome on April 3, 2015
  12. math

    Samuel solved the equation h – 234 = 1,192 and found the solution to be h = 958. Is he correct? He is right I think because when you subtract 234 from 1192 it equals 958 right?

    asked by Jake on October 23, 2012
  13. inverse trig HELP PLEASE!!

    Write the general solution to y = arcsin (0.6428). 40°±360°k 140°±360°k 220°±360°k 320°±360°k How do I find the right answer? I am like seriously stuck. I need help please.

    asked by Adrianna on March 18, 2012
  14. science

    the vapour pressure of pure liquid benzene and toluene are 160mm and 60 mm repectively. calculate the vapour pressure of an equimolar solution at the same temperature?

    asked by priyanka on January 23, 2015
  15. Chem

    Zinc reacts with HCl to produce ZnCl2 and Hydrogen gas, H2. What volume, in ml of a 1.25 M solution would be required to completely react with 3.27 g of Zn? Zn(s) + 2 HCl (aq) -------> ZnCl2 + H2

    asked by Meagan on December 13, 2011
  16. A.P. Environmental Sciences

    .5 grams of pure copper sulfate powder and 2L of water were used to create a copper sulfate solution with a concentration .5ppm. How was this done?

    asked by Michelle on October 10, 2012
  17. AP Chemistry

    redox reaction: Hydrogen peroxide is added to an acidified solution of potassium permanganate. what is the total redox reaction?

    asked by Gabriella on September 23, 2013
  18. chemistry

    A 0.25 mol/L solution of benzoic acid, KC7H5O2 and antiseptic also used as a food preservative, has a pH of 2.40. Calculate the Ka of benzoic acid at SATP

    asked by Geroge B. on April 5, 2008
  19. Punakha central school. Bhutan

    Dissociation constand of propanoic acid is 1.76. Determine degree of dissociation of P ropanoic acid in 0.2molar in aqueous solution?

    asked by dorji on March 29, 2017
  20. chemistry

    2.) A particular vinegar is found to contain 5.9% acetic acid by mass. What mass of this vinegar should be diluted with water to produce 0.750 L of a solution with pH = 4.58?

    asked by anonymous on March 28, 2010
  21. Science

    An aqueous solution of calcium chloride boils at 101.3. How many kilograms of calcium chloride were dissolved in 1000 g of the solvent?

    asked by Nita on January 25, 2012
  22. Chemistry

    A student prepared a 0.10 M solutino of acetic acid, CH3COOH. Acetic acid has a Ka of 1.75 x 10^-5. What are the hydronium ion concentration and the pH of the solution?

    asked by Sue on January 18, 2008
  23. chemistry

    The 17.35 g of NaCl sample was dissolv ed in an unknown amount of water. All we know is that prepared solution has 22.5% of NaCl . The mass of water is _____ g.

    asked by shawna on October 17, 2016
  24. Chemistry

    A solution contains 0.0200 M Pb2 (aq) and 0.0200 M Sr2 (aq). If we add SO42–(aq), what will be the concentration of Pb2 (aq) when SrSO4(s) begins to precipitate?

    asked by Jematormal91 on April 6, 2012
  25. Chemistry

    For propanoic acid HC3H5O2, Ka = 1.3 ✕ 10−5 and 0.102 M solution. [HC3H5O2] ____M [C3H5O2− ] ____M percent dissociation ____percent

    asked by chem_student on March 3, 2019
  26. Science

    The fly food recipe requires that the final solution contain 1.5% agar. If the final volume is 800ml, how much agar will you need? I get 12ml, does that seem right?

    asked by Anonymous on November 24, 2011
  27. Science

    What is the mass percent of sodium hydroxide in a solution that is made by dissolving 8grams of sodium hydroxide in 50 grams of H2O?

    asked by Araceli on July 7, 2014
  28. chemistry

    An element X burns in air to form an oxide. When the oxide is shaken in water, the resulting solution has a pH greater than 7. What could the element be?

    asked by FQXE on March 10, 2011
  29. chem

    the mass/volume percent of a NaCl solution in which 136 g of NaCl is dissolved in enough water to give a total volume of 4.90 L .

    asked by mar on August 1, 2015
  30. science

    freezing point of pure solvent remains constant whereas the freezing point of a solution continues to decrease with time

    asked by areen on February 20, 2016
  31. URGENT chemistry

    Mulitple choice What is the concentration of H^+ in solution given the [OH^-]= 1.32x10^-4 a)7.58x10^-11M b)1.32x10^-11M C)1.0x10^14M d)not enough information E)none of the above

    asked by Anonymous on December 6, 2011
  32. chemistry

    Calculate the volume in liters of a M copper(II) sulfate solution that contains of copper(II) sulfate . Round your answer to significant digits.

    asked by sam on September 21, 2014
  33. Chemistry

    What mass of oxalic acid dihydrate , H2C2O4•2H2O, is required to prepare 220.0 ml of a 1.28 M solution of oxalic acid ?

    asked by Cynthia on February 22, 2012
  34. math

    a lab assistant wants to make 5 liters of 27.8% acid solutions. if solutions of 50% and 13% are in stock, how many liters of each must be mixed to prepare the solution?

    asked by Anonymous on March 28, 2013
  35. ap chem

    Calculate the percent ionization of a 0.76 molar solution of acetic acid. The ioniza- tion constant of acetic acid is 1.8 × 10−5.

    asked by Anonymous on February 14, 2011
  36. Chemistry

    Find the molarity of a sodium hydroxide solution obtained by dissolving 125.0 mg of sodium hydroxide in 50.ml volumetric flask.

    asked by Allison on March 10, 2015
  37. chemistry

    Balance the following redox reaction occurring in acidic solution Cu(s) + NO3-(aq)--> Cu2+(aq) +NO2(g) This is what I have done so far Cu-->Cu2+ + 2e- 2H + NO-3 --> NO2 + H2O Need help please

    asked by Monique on November 20, 2011
  38. chemistry

    What is the mole fraction of sulfuric acid in a solution made by adding 3.4 grams of sulfuric acid to 3500 mL of water?

    asked by amber on April 28, 2011
  39. chemistry

    What is the pH of a sodium acetate solution prepared by adding 0.820g of sodium acetate to 100.0mL of water at 25 degrees?

    asked by Natalie on March 29, 2011
  40. chemistry

    What volume of a 0.550 M solution of potassium hydroxide can be made with 18.3 g of potassium hydroxide? (Ignore significant figures for this problem.)

    asked by Andy on September 28, 2014
  41. Chemistry

    It requires 17.9 mL of 0.120 M KOH to titrate 78.0 mL of an HCl solution of unknown concentration. Calculate the initial HCl concentration.

    asked by Kyle on February 27, 2012
  42. Algebra

    Not understanding the question. Why a solution of a word problem should be checked using the original wording of the problem and not the equation written from the wording.

    asked by Cindy on February 2, 2011
  43. Calculus

    For Questions 1–2, use the differential equation given by dy/dx = xy/3, y > 0. 1. Complete the table of values x -1 -1 -1 0 0 0 1 1 1 y 1 2 3 1 2 3 1 2 3 dy/dx 2. Find the particular solution y = f(x) to the given differential equation with the initial

    asked by Howie on May 10, 2018
  44. Chemistry

    titration of a 50.00mL of KOH required 175.00mL of 0.0150M acetic acid, what is the Molarity of KOH solution

    asked by Shay on April 8, 2013
  45. MATH

    If 20% of population have blue eyes, and 5 people are selected at random, what is the probability that at least 4 of them have blue eyes? HOW DO I FIND THE SOLUTION TO THIS PROBLEM?

    asked by STEPHANIE on March 25, 2011
  46. Chemistry

    Which pair of compounds will form a solution? A) Benzene (C6H6) and Hexane (C6H14) B) Na2SO4 and Benzene C) NaCl and Hexane

    asked by Emily on April 20, 2012
  47. chemistry

    You mix 50.0 ml of 2.0 M HCl and 50.0 ml of 2.0M NaOH. The temperature of the resulting solution increases from 22.5 degrees celcius to 32.3 degrees celcius. What is the q of the calorimeter

    asked by Anonymous on October 12, 2014
  48. Math

    P1V1/T1=P2V2/T2 combined gas law 1.0atm*0.50L/298K=5.0atm*0.50L/T2 Can you help me to go from this step to the solution?

    asked by Gayla on July 26, 2009
  49. Math

    step by step solution of A motorist drives 80km at an average speed of 63km/h.which average is this:mean,median or mode?

    asked by Mystic on October 11, 2016
  50. Chem

    Hypobromous acid,HOBr, has acid -ionization constant of 2.5 X 10^-9 at 25 Celsius . What is the pOH of a 0.63 M HOBr solution? A4.40 B3.87 C5.20 D9.60 E10.13 I'm getting two answers between A or B

    asked by Chemistry on March 19, 2013
  51. Chemistry

    12.00 g of sugar is dissolved in some water in a cylinder of diameter 7.00 cm. To what height should the cylinder be filled (with more water) to produce a solution with concentration 11.00 g/dm^3?

    asked by Henry on January 20, 2011
  52. chemistry

    Acetic acid ionizes in water according to the following equation: CH3COOH = H^+ +CH3OO- if the solution is .773 M acetic acid, what is the concentration of H^+?

    asked by Rory on November 13, 2010
  53. chemistry

    One teaspoon of instant coffee ( 3 grams ) is dissolved in 250 grams of water. What percent of the resulting solution is coffee ?

    asked by Anonymous on November 20, 2014
  54. science

    15 ml of satuated solution of potassium chloride in water at 50 degrees celecius is raised to 70 degrees celecius. How much more kcl will dissolve

    asked by karen on December 22, 2014
  55. Chemistry

    Q49 One litre of solution contain 30g acetic acid the active mass of acetic acid is? Ans 1.0mol/L

    asked by Lara on September 30, 2018
  56. Chemistry

    Concentrated sulfuric acid used in the laboratory is 92% H2SO4 by mass. Calculate the mass of water in a 100 g solution of this acid in kg.

    asked by Steph on October 18, 2010
  57. Biochemistry

    Explain how to prepare 1L of a buffer at pH 7.4 using 1M hypochlorous acid (Ka = 3.5 x 10-8) and a 1 M NaOH solution. Indicate the volume of hypochlorous acid and sodium hydroxide to use.

    asked by Jen on March 13, 2013
  58. Calculus

    For Questions 1–2, use the differential equation given by dy/dx = xy/3, y > 0. 1. Complete the table of values x -1 -1 -1 0 0 0 1 1 1 y 1 2 3 1 2 3 1 2 3 dy/dx 2. Find the particular solution y = f(x) to the given differential equation with the initial

    asked by William on May 7, 2018
  59. science

    The solubility of NaCl in water at 100 degrees celsius is 39.1 g/100 g water. Calculate the boiling point of this solution?

    asked by Frank on July 5, 2012
  60. maths

    For what natural number of x and y the equation 2x+5y-7=0 has unique solutions? If the values are taken from collection of real numbers do you think the equation has unique solution

    asked by usha on October 26, 2015
  61. chemistry

    Write the anodic reaction for the electrolysis of concentrated zinc chloride solution. (a) Using plantium electrodes. (b) Using zinc electrodes

    asked by Shane on September 6, 2014
  62. Science

    15 ml of saturated solution of potassium chloride in water at 50 degress Celsius is raised to 70 degress Celsius. How much more kcl will dissolve?

    asked by Brian Chum on December 14, 2014
  63. Chemistry

    A patient receives 3.0 ml of a solution containing technetium 99 for breast image. If the activity of the technetium 99 is 9.5 mCi/mL, what is the dose received by the patient?

    asked by Kim on July 20, 2012
  64. Chemistry

    Explain why the freezing point of a pure solvent is constant, whereas the freezing point of a solution decreases with steady cooling.

    asked by Cassie on March 20, 2011
  65. Chem

    The question is; About Fe+2 concentration will Fe(OH)2 precipitate from a buffer solution that has a PH = 9.29? The Ksp of Fe(OH)2 is 4.87x10^-17 So here is what I did, Ksp = (x) (2x)^2 = 4x^3 4.87x10^-17 = 4x^3 x = 2.30x10^-6 I don't know what do I have

    asked by Kim on October 26, 2010
  66. Chemistry 2

    An aqueous solution has a vapor pressure of 81.1 at 50 . The vapor pressure of pure water at this temperature is 92.6. What is the concentration of in mass percent?

    asked by Jesse on January 27, 2011
  67. Chemistry

    What is the hydrogen ion concentration in a 0.15 molar solution of acetic acid in water at 25 degrees C? Acetic acid is 1.3 % dissociated.

    asked by Emily on May 23, 2011
  68. chemistry

    Given a PH of buffer solution is 4.23 made from 0.35 formic acid. Calculate the concentration of formate.The constant dissociation for formic acid is 3.75

    asked by zephaniah on June 19, 2017
  69. Chemistry!

    0.0100 Ba(OH)2 is dissolved in water to give 500.0 mL of solution calculate OH- concentration would it be the molarity of Ba(OH)2 (0.0100 / 0.500) multiplied by two because there is twice as much OH??

    asked by Sue Ellen on August 10, 2008
  70. chemistry

    For a particular redox reaction NO is oxidized to NO3^– and Cu^2+ is reduced to Cu. Complete and balance the equation for this reaction in basic solution: NO + Cu^2+ --> NO3^- + Cu^+ help. thanks.

    asked by dr. bob rocks on December 4, 2012
  71. chemistry

    Determine the mass of CuSO4.5H20 needed to make 250 mL of a .100M CuSO4.5H20 aqueous solution..

    asked by danielle on October 9, 2012
  72. chemistry

    How ml silver nitrate solution (0.05 mol / l) K = 1.0000 consumed for titration of sodium chloride, 0.0500 g. MW Sodium chloride 58.44.

    asked by ULIA on March 25, 2014
  73. Chemistry

    how many grams of potassium bromide could be recovered by evaporating 650 grams of 15 perentKBr solution to dryness...... 650 * (.15) = 97.5 is this correct

    asked by Pierre on October 25, 2010
  74. Chemistry

    Calculate hydroxyl ion concentration, ph and the percent hydrolysis for 0.1M solution of sodium cyanide (hints know for cyanide ion is 2.5*10^-5).

    asked by Wendy on August 13, 2018
  75. chemistry

    23.8 ml of a 2.0 mol/l surfuric acid solution reacted completely with 68.0 ml of potassium hydroxide. find the concentration of potassium hydroxide

    asked by walter on June 12, 2015
  76. Chemistry

    How to prepare 10% w/v nitric acid solution? Do I just weigh 10g of concentrated nitric acid (65%) and dilute to 100ml with water?

    asked by jessie on October 11, 2011
  77. chemistry

    In propanol, cholesterol is 2.7 times more soluble at 43°C than at 20°C. If a saturated propanol solution is prepared at 43°C , what proportion of the cholesterol will crystallize upon cooling to 20°C?

    asked by lisa on November 30, 2010
  78. chemistry

    Acetic acid ionizes in water according to the following equation: CH3COOH = H^+ +CH4COO- If the solution is .906 M acetic acid, what is the concentration of H+?

    asked by Hermione on November 15, 2010
  79. chemistry

    Suppose that a student calculated Kf of biphenyl to be 81.2C kg/mol. calculate the mass of an unknown if a solution containing 1.64 g of unknown in 18.22 g of biphenyl froze at 39.9 C

    asked by Artem on February 24, 2014
  80. chemistry

    The compound sodium sulfate is soluble in water. When this compound dissolves in water, which ion listed below would be present in solution?

    asked by shanw on February 19, 2014
  81. Math

    A rotating videocamera in the parking garage goes through 4 complete rotations in 3/4 hour. How many rotations will it make in 1 hour? Would this be a two part solution?

    asked by Anonymous on October 9, 2009
  82. science

    What is the hydroxide-ion concentration of a 0.240 M oxalic acid, H2C2O4, solution? For oxalic acid, Ka1 = 5.6 × 10–2 and Ka2 = 5.1 × 10–5. 6)

    asked by swapnil on July 7, 2012
  83. chem urgent

    Calculate the mass ( kg ) of the solute benzene and the mass ( kg ) of the solvent acetone that should be combined to generate 1.51 kg of a solution that is 0.275 m benzene.

    asked by henry on February 6, 2009
  84. chemistry

    50.0 mL of an unknown HCl solution was titrated with 0.449 M NaOH. To reach the equivalence point, 38.4 mL of the NaOH was used. What was the concentration of the HCl?

    asked by james on March 25, 2015
  85. math

    Find the approximate value of the volume of the right circular cone of 20 cm , 32 cm with a circular base shown below. Approximate your solution to the nearest hundredth.

    asked by kim on December 29, 2011
  86. chemistry

    It requires 23.2 mL of 0.250 M KOH to titrate 49.0 mL of an HCl solution of unknown concentration. Calculate the initial HCl concentration.

    asked by amber on March 18, 2014
  87. Chemistry

    If I had one gollan of sodium hydroxide solution which had a concecentration of two pounds of sodium hydroxide per gallon, What would be the concentration of four gallons of that acid?

    asked by Kisha on November 14, 2010
  88. Chemistry

    What is the mole fraction sodium acetate of a solution made by adding 0.145 g of sodium acetate to 119 ml water?

    asked by Steve on November 2, 2012
  89. chemistry

    Balance the follwoing chemical reaction in an acidic solution __H2O(l) + __H^+(aq)+ OH^-(aq)+ __ CR2O7^2-(aq) + __ Cl^-(aq)---> __ Cr^3-+ __Cl2(aq)+ __H2O(l) + __H^+(aq) + __ OH^-(aq)

    asked by Amandeep on April 22, 2008
  90. chemistry

    What volume of a 0.550 M solution of potassium hydroxide can be made with 14.3 g of potassium hydroxide? (Ignore significant figures for this problem.)

    asked by lulu on November 29, 2014
  91. chemistry

    How many grams of sodium hydroxide (NaOH) are needed to prepare 250 mL of a 0.20 M (mol/dm3) sodium hydroxide solution?

    asked by pippiserra on May 5, 2014
  92. Chemistry

    Calculate the concentration (molarity) of copper(ii) sulfate, CuSO4, in 1L of solution containing 200g Copper-Sulfate-Penetahydrate(CuSO4x5H2O)?

    asked by Orangutan on August 15, 2017
  93. chemistry

    Calculate the molarity of 12.5g of sucrose (C12H22O11) in 80mL of solution. 12.01 x 12 = 144.12 1.01 x 22 = 22.22 16.00 x 11 = 176.00 ------------------- 342.34 12.5g ----- / 342.34 = 0.003/80 = 4.56 80mL

    asked by kiki on October 25, 2016
  94. chemistry

    23.8 ml of a 2.0 mol/l surfuric acid solution reacted completely with 68.0 ml of potassium hydroxide. find the concentration of potassium hydroxide

    asked by walter on June 12, 2015
  95. Science

    Julie dissolved 20 g of sugar in a cup of water. The mass of the solution was 500 g. What volume of water did Julie start with?

    asked by Anonymous on February 3, 2016
  96. is this correct?- math

    find the domain of the real valued function; f(x) = sqrt(5 - (sqrtx)) my solution: 5 - (sqrt x) >=0 -(sqrt x) >= -5 (sqrt x)

    asked by HARRY on February 12, 2012
  97. chemistry

    calculate the freezing point of an aqueous solution containing 10.50 g of MgBr2 in 200 g of water (MgBr2=184 g, Kf for water =1.80 K kg mol-1)

    asked by rahul on June 12, 2013
  98. Chemistry Help

    Calculate the mass of Crystals that will form in 400g of water if the solution is cooled from 55 degree cellcious to 15 degree cellcious?

    asked by Shannah on August 17, 2017
  99. chemsitry

    Calculate the mass in grams of sodium bromide, NaBr, are needed to prepare 250.0 mL of a solution of sodium bromide that is 3.50% (m/v).

    asked by allen on March 20, 2011
  100. chemistry

    What is the percent by mass concentration of KCl in a solution prepared by adding 80 grams KCl to 200 grams of water?

    asked by Cristina on October 11, 2011

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