1. Chemistry

    To illustrate the calculation, assume that 21.95 mL of a thiosulfate solution is required to reduce the iodine liberated by 20.85 mL of 0.0200M KIO3 and that 18.63 mL of the same thiosulfate solution reacts with the iodine replaced by 20.00 mL of an

    asked by Marcus on April 26, 2013
  2. Physical Chemistry

    One potential problem with using molarity to express concentration is that molarity is temperature dependent. If you make a 1.000 M solution of aqueous HCl at 25 degrees celsius, what would the molarity of this solution become if the temperature of the

    asked by Matt on September 29, 2017
  3. chem

    a 45.8mL sample of a 5.8 M KNO3 solution is diluted to 1.00L. What volume of the diluted solution contains 15.0g KNO3? how do you do this? moles of solution: 5.8*.0458 moles Grams of solute= moles*molmassKNO3 Volume of 15g= 1000ml*15/gramssoluteabove

    asked by kyle on April 5, 2007
  4. Chemistry

    100 mL of buffer solution that is 0.15M HA (Ka= 6.8x10-5) and 0.20M NaA is mixed with 15.2mL of 0.35M NaOH. What is the pH of the resulting solution? 100 mL of buffer solution that is 0.15M HA (Ka= 6.8x10-5) and 0.20M NaA is mixed with 28.3mL of 0.25M HCl.

    asked by Anonymous on September 29, 2018
  5. Physical Science

    To create a supernaturated solution, a student heats a beaker of water on a hot plate and adds sugar until no more sugar will dissolve. The student then strains the solution through a funnel using filter paper and allows the solution to cool. Name two

    asked by SHAZAM on January 12, 2011
  6. Chemistry

    Please help! I'm trying to find the solubility of Ca(OH)2 in .001305 mol/L aqueous NaOH? Saturated solution of Ca(OH)2 in 0.01305 mol/L NaOH. [HCl] = 0.1213 M Volume of HCl = 9.81 mL Volume of Ca(OH)2/NaOH aliquot = 25ml Find: 1. the TOTAL [OH-] in the

    asked by Alex on March 20, 2017
  7. chemistry

    You have a 250ml solution of 0.13M calcium iodate. How many grams of potassium iodate need to be added to the solution to begin to precipitate calcium iodate? The solubility product constant for calcium iodate is6.47 *10^-6. B) you have a 250ml solution of

    asked by anonymous on November 18, 2015
  8. chemistry

    does this sound right for what happens with the zinc and lead nitrate reaction? could i add anything else? The zinc displaces the lead. You can observe the lead preipitating on the zinc surface. The zinc changes to black crystals which dissolve in the

    asked by Nabiha on June 20, 2009
  9. Chemistry

    A 10.0 L container contains 1.0 L of solution of a gas. Assume [gas]=1.5x10^-4 M in solution when 2 mol of gas remain in gas form. If 1 mol of gas is removed from the gas phase, what will be the new concentration of the gas in solution? What is the value

    asked by Sarah on February 15, 2016
  10. Chemistry-ksp and kb

    We were given a 0.1 M KOH solution.25cm3 of that solution is taken and 5g of MX precipitate is added to that.X- is an anion of a strong acid. Kb for MOH=2*(10)^-5 Ksp for MX= 3*(10)^-6 M 1)find the [M+] in the solution 2)Find the [X-] concentration and pH

    asked by Shenaya on May 24, 2017
  11. English to writeteacher

    I started writing my essay regarding The Undomestic Goddess. Sometimes its easier to run from your problems than face them they will eventually catch up to you. Samantha Sweeting was a smart articulate lawyer who was hoping to become a partner in her law

    asked by Taunya on January 22, 2007
  12. Improving your writing Revised

    For the past three months there seems to be an ever-growing problem at our company of DMD Medical Supplies: The quality of work has been poor; the morale of various employees has been brought down; and the workflow has been uneven amongst both teams and

    asked by Shawna on February 2, 2012
  13. Chemistry

    One last question...even though no one seems to be willing to help me out without being rude. The blood volume in a cancer patient was measured by injecting 5.0 mL of Na2SO4(aq) labeled with 35S (t1/2 = 87.4 d). The activity of the sample was 300 µCi.

    asked by Trixie on April 16, 2010
  14. English

    i read the book the dark and deadly pool but i have need to kno 3 chraters and 2 conflicts about it THANKX Since you read the book, I'm sure you know three of its characters. Those are the main people in the book. Mary Elizabeth was the main character. Who

    asked by Anonymous on October 6, 2006
  15. Chemistry

    To prepare a solution of NaCl, you weigh out 2.634 (0.002)g and dissolve it in a volumetric flask whose volume is 100.00 (0.08) mL. Express the molarity of the solution, along with its uncertainty.

    asked by Taylor on October 2, 2016
  16. chemistry

    what volume of a 0.247 M perchloric acid solution is required to neutralize 23.8 mL of a 0.156 M calcium hydroxide solution? _titration problem of acids/bases

    asked by Elise on April 2, 2015
  17. chemistry

    50 mL of a 2.50 M solution of ammonium phosphate is added to 100mL of a 1.50 M solution of calcium nitrate. At the end of the reaction 11.2 grams of precipitate produced. What is the percent yield

    asked by Bleh on April 18, 2012
  18. chemistry

    8.00g of NaOH are dissolved in water to make 4.00L of solution. What is the concentration of hydronium ions, [H3O+], in this solution? Express your answer with the appropriate units.

    asked by Anonymous on November 7, 2014
  19. CHEM

    What is the molarity of a calcium sulfate solution prepared by adding 27.89g of CaSo4 to sufficient water to make a final solution volume of 1.00L?

    asked by Lisa on February 7, 2013
  20. chemistry

    If you put 0.25 molar solution of Sodium Chloride (NaCl) in 100 ml of distilled water. ... how much salty precipitate remains in an evaporating dish from 10 ml of solution?

    asked by Bev on January 18, 2016
  21. CHEM

    What is the molarity of potassium iodide solution prepared by adding 5.810g of KI to sufficient water to make a final solution volume of 250.0mL?

    asked by Lisa on February 7, 2013
  22. Chem

    If a solution containing 88.445 g of mercury(II) perchlorate is allowed to react completely with a solution containing 13.180 g of sodium sulfide, how many grams of solid precipitate will be formed?

    asked by asd on February 1, 2016
  23. Chemistry

    A solution of boric acid (H3BO3) in water has a pH of 3.45. If the solution also contained NaHBO3, what do you expect to happen to the pH? Increase Decrease Stay the same Not enough information provided

    asked by apersonyoudontknow on March 20, 2017
  24. Chemistry

    An aqueous solution with a density of 0.998 g/ml at 20 degrees Celsius is prepared by dissolving 12.8 mL of CH3CH2CH2OH (p=0.803 g/mL) in enough water to make 75.0 mL of solution calculate the molarity

    asked by Jessica on October 1, 2011
  25. chemistry

    Please help?! if 600 mL of a 0.04M KCl solution is mixed with 50mL of a 0.03M Na2SO4 solution, will a precipitate be formed? Explain your reasoning and/or show all calculations?

    asked by ryan on February 1, 2015
  26. chemistry

    sorry i forgot some of the units in the initial posting 8.00g of NaOH are dissolved in water to make 4.00L of solution. What is the concentration of hydronium ions, , in this solution?

    asked by katy on November 2, 2009
  27. Chemistry

    If a solution containing 107.68 g of mercury(II) perchlorate is allowed to react completely with a solution containing 17.796 g of sodium sulfide, how many grams of solid precipitate will be formed?

    asked by Julia on October 11, 2016
  28. Chemistry

    You mix 200.0 mL of 0.350 M HCl with a 300.0 mL solution of 0.100 M Ba(OH)2. Calculate the concentration of each ion remaining in the solution after the reaction has reached completion.

    asked by Leslie on September 25, 2013
  29. analytical chemistry

    What volume (in liters) of 0.96 M KOH solution should be added to a 0.130 L solution containing 10.2 g of glutamic acid hydrochloride (Glu, FW=183.59; pKa1=2.23, pKa2 =4.42, pKa3=9.95) to get to pH 9.90?

    asked by joi on March 27, 2014
  30. chemistry

    if 36.23mL of a standard 0.1959M NaOh solution is required to neutralize 25.00mL of H2SO4. what is the Molarity of the acid solution, balance the equation. Please help with calculation. Thank you for your help.

    asked by kate- Please help on September 1, 2012
  31. chemistry

    If a solution containing 34.576 g of mercury(II) perchlorate is allowed to react completely with a solution containing 10.872 g of sodium sulfate, how many grams of solid precipitate will be formed?

    asked by lee on April 19, 2013
  32. chemistry

    if you dissolve 20mg of alcl3 into 2.0 of a 2.5 molal nacl solution (density 1.08kg/l), what would be the mass concentration (ppm(weight)) of al3+ in the resulting solution?

    asked by Ashley on January 26, 2014
  33. Chemistry

    A 25.0mL sample of a 0.100M solution of acetic acid is titrated with a 0.125M solution of NaOH. Calculate the pH of the titration mixture after 10.0, 20.0, and 30.0 mL of base have been added.

    asked by Amanda on November 8, 2010
  34. chem

    Assume that 35.0 mL of a 0.13 M solution of a weak base B that accepts one proton is titrated with a 0.13 M solution of the monoprotic strong acid HX. (a) How many moles of HX have been added at the equivalence point?

    asked by hannah on March 24, 2013
  35. chemistry

    What volume (in liters) of 0.94 M KOH solution should be added to a 0.090 L solution containing 9.1 g of glutamic acid hydrochloride (Glu, FW=183.59; pka1=2.23, pka2=4.42, pka3=9.95) to get to pH 10.20?

    asked by Decisice 2 on May 23, 2013
  36. Chemistry #4

    What is the concentration of a solution formed by dissolving 10.0g of ammonium acetate in enough water to form 150.0mL of solution? Could someone please explain and show me how to do this? I have the answer= .865M But I am not sure exactly how?!

    asked by Chelsea on December 9, 2013
  37. chem

    A sample of 45.0 ml of 0.750M AgNO3 solution is added to 65.0ml of 1.375M Cr(NO3)3 solution. Calculate the resultant concentration of nitrate ions in the mixture.

    asked by bec on January 7, 2009
  38. Chemistry

    Balance these reactions using the half-reaction method Sn2+ + IO3- -> Sn4= + I- (acidic solution) CrO2 + ClO- -> CrO42- + Cl- (basic solution)

    asked by Mary on May 26, 2010
  39. chemistry

    What volume (in liters) of 0.96 M KOH solution should be added to a 0.090 L solution containing 9.9 g of glutamic acid hydrochloride (Glu, FW=183.59; pKa1=2.23, pKa2 =4.42, pKa3=9.95) to get to pH 10.20?

    asked by shanonn on May 3, 2013
  40. algebra

    solve the following systwm graphically. Be sure to check your solution. if the system has an infinite number of solutions, use set-builder notation to write no solution, state this. 4y=x+8, x=2/3y+2

    asked by jessica on July 9, 2014
  41. chemistry

    An aqueous solution contains 0.445 M ethylamine (C2H5NH2). How many mL of 0.226 M hydrochloric acid would have to be added to 150 mL of this solution in order to prepare a buffer with a pH of 10.200

    asked by chem on March 16, 2015
  42. Chem

    A 0.2181 g sample of KHP required 17.29 mL of sodium hydroxide solution to reach the phenolphthalein end point. Calculate the molarity(M) of the NaOH solution.

    asked by Donnie on October 9, 2012
  43. chemistry

    A scientist wants to make a solution of tribasic sodium phosphate, , for a laboratory experiment. How many grams of will be needed to produce 400 of a solution that has a concentration of ions of 1.20 ?

    asked by Marry on September 29, 2010
  44. Chemistry

    Refer to the calibration curve shown in the experiment. If the absorbance of the solution is 0.400, what is the concentration of the iron in that solution? Show or explain how you arrived at your answer.

    asked by Elly on June 20, 2011
  45. chem 1046

    Calculate the solubility (in grams per 1.00 102 mL of solution) of magnesium hydroxide in a solution buffered at pH = 9. Enter your answer to 2 significant figures.) Ksp = 2.06e-13

    asked by Anonymous on July 9, 2012
  46. chemistry12_2016-2

    14.0 grams of potassium hydroxide was dissolved to form 100 centimetre cubeof an aqueous solution. What was the concentration of this solution in mol/decimetre cube.

    asked by Anonymous666_4 on March 27, 2016
  47. chemistry

    the student's lab manual says to mix some of his CaCl2 solution with an aqueous solution of sodium carbonate (Na2CO3). What evidence of a chemical reaction would he expect to see?

    asked by jalisa on December 17, 2012
  48. Chemistry

    How many grams of solid KOH must be added to 100ml of a buffer solution which is 0.1M each with respect to the weak acid HA and its potassium salt KA in order to make the pH of the solution 6.0?

    asked by Sandu on October 4, 2016
  49. chemistry

    to what volume should you dilute 125mL of an 8.00M CuCl2 solution so that 50.0mL of the diluted solution contains 5.9g KNO3 I have a hard time determing the M1V1=M2V2 is

    asked by swtnblk on November 6, 2011
  50. chemistry

    a 12ml sample of 0.4m silver nitrate solution is mixed with 8 ml of 0.8m sodium chloride solution. determine the identity of precipitate and the number of grams produced.

    asked by Anonymous on May 4, 2015
  51. Chemistry

    How many grams of aspirin (C9H8O4) are required to react with exactly 29.40 mL of a 0.02400% w/w solution of sodium hydroxide (NaOH)? What would the consequences be in 0.01200% w/w solution was used instead? Thanks for any help - no idea how to proceed.

    asked by Che on January 18, 2011
  52. Chem II

    Find the mass of sodium formate that must be dissolved in 200.00cm^3 of a 1.0M solution of formic acid to prepare a buffer solution with pH=3.40? I have no clue how to work this out. Please help me.

    asked by Bianca on November 19, 2012
  53. Chemistry-Experiment

    I did an experiment where I had 5 ml of MgCl2, then 5 ml NH4 solution (NH4OH (aq)) was added and it was observed that a precipitate formed; cloudy solution. After I added 1g of NH4Cl(s), the solution clears up (transparent). 2nd experiment: There was 5ml

    asked by Fresca on March 30, 2012
  54. Chemistry

    Under an O2(g) pressure of 1.00 atm , 28.31mL of O2 (g) dissolves in 1.00L H2O at 298K. What will be the molarity of O2 in the saturated solution at 298K when the pressure is 3.86atm ? (Assume that the solution volume remains at 1.00L .) I used PV=nRT and

    asked by Amber on February 22, 2010
  55. Chemistry

    Under an O2(g) pressure of 1.00 atm , 28.31mL of O2 (g) dissolves in 1.00L H2O at 298K. What will be the molarity of O2 in the saturated solution at 298K when the pressure is 3.86atm ? (Assume that the solution volume remains at 1.00L .) I used PV=nRT and

    asked by Someone please help. on February 22, 2010
  56. statistics

    A professor is interested in determining whether assigning mandatory homework affects students’ grades. He is currently teaching two sections of the same class; in one class, he assigns mandatory homework problems, while in the second class, he just

    asked by matt on October 24, 2014
  57. Chemistry

    A solution of I2 was standardized with ascorbic acid. Using a .1000 g sample of pure ascorbic acid, 25.32 mL of I2 were required to reach the starch end point. A. What is the molarity of the iodine solution? B. What is the titer of the iodine solution?

    asked by Ana on May 26, 2011
  58. chemistry

    The pH of saturated is found to be 13.12. A 15.0mL sample of saturated Sr(OH)2 is diluted to 250.0mL in a volumetric flask. A 15.0 mL sample of the diluted Sr(OH)2 is transferred to a beaker, and some water is added. The resulting solution requires 27.6mL

    asked by chips ahoy on April 11, 2011
  59. Algebra

    -Alfonso can write 100 practice problems for the math team in 20 hours, Beauregard can write the same number of problems in 30 hours, and Clyde can write the number of problems in 40 hours. Working together, at what time will the three of them finish

    asked by Mark on December 5, 2012
  60. chemistry

    If you add 50 g of sylvite in 100 ml of water at 60 ° C, the resulting solution will she unsaturated, saturated or supersaturated? You prepare a solution and you add 50 g of potassium nitrate to 100 ml of water at 50 ° C. What type of solution are you

    asked by Kay on February 8, 2011
  61. chem

    Equal volume of a 0.02 M Zn+ solution and a 2.0M NH3 solution are mixed. Kf for [Zn(NH3)4] is 4.1*10^8. If enough sodium oxalate is added to make the solution 0.1 M in oxalate, will ZnC2O4 precipitate. Ksp ZnC2O4= 2.7*10^-8. I set up an ICE table which

    asked by Sara on August 10, 2009
  62. PreCalc

    Approximate the solutions to the following equation on the interval [0,2π). Round your answer to four decimal places. sinθ=0.65 Apparently, there suppose to be two answers to this question with a comma separating​ both answers. I know because I've

    asked by chizoba on August 15, 2016
  63. Chemistry

    A solution is prepared by dissolving 0.56 grams of benzoic acid (HC6H5CO2, MM = 122.12 g/mol, Ka = 6.4 X 10-5) in enough water to make 1.0 L of solution. Calculate the pH of this solution at equilibrium. 2. Calculate the pH of the system in Question 1 when

    asked by meow on March 26, 2019
  64. Math

    How many gallons of 15% iodine solution should be mixed with 40% iodine solution to make 100 gallons of a 20% solution?

    asked by Helen on January 24, 2012
  65. Chemistry

    You have a stock solution of 5.0 M H2SO4. How many mL of stock solution are required to make 136 mL of 1.6 M H2SO4 solution

    asked by Linzy on April 8, 2013
  66. Algebra II

    What is the solution of the system of equations? {-3x - 4y - 3z = -7 {2x - 6y + 2z = 3 {5x - 2y + 5z = 9 A. (5,-2,7) B. (-5,2,7) C.(5,2,-7) D. No solution Use a matrix to find the solution to the system of equations. {-8x - 8y = -16 {6x - 9y = -108

    asked by HELPME on September 27, 2018
  67. math

    log4(x-3)=2 4^2=x-3 16=x-3 19=x Does this mean the solution would be x=19 or no solution? How would I check this to know if 19 is a solution. I know I plug it back in. Like so: log4(19-3)=2 4^2=19-3 16=16 Did i check correctly?

    asked by Anonymous on November 20, 2014
  68. algebra

    How many liters of 20% alcohol solution should Maria mix with 50 liters of a 60% alcohol solution to obtain a 30% solution?

    asked by Deja on July 23, 2010
  69. HARD chemistry

    A solution of ferrous sulfate (FeSO4) is titrated with a solution of potassium permanganate in sulfuric acid. The balanced half reactions are as follows: 10FeSO4 + 5 H2SO4 --> 5 Fe2(SO4)3 + 10 H ^+ +10e^- and 2 KMnO4 + # H2SO4 +10e^- --> 2 MnO4 + K2SO4 + 8

    asked by Amy on January 4, 2010
  70. chemistry

    A solution of ferrous sulfate (FeSO4) is titrated with a solution of potassium permanganate in sulfuric acid. The balanced half reactions are as follows: 10FeSO4 + 5 H2SO4 --> 5 Fe2(SO4)3 + 10 H ^+ +10e^- and 2 KMnO4 + # H2SO4 +10e^- --> 2 MnO4 + K2SO4 + 8

    asked by amy on January 5, 2010
  71. Chemistry

    A sample of 0.0020 mole of HCl is sissolved in water t omake a 2000ml solution. Calculate the molarity of the HCl solution, the (H30+) and the pH. For a strong acide such as HCl the (h30+) is the same as the molarity of the HCl solution. HCl +H20 Balanced

    asked by Susie on December 1, 2010
  72. College Chemistry/Lab Math

    I think I have this problem figured out correctly, but is there anyone who can tell me if I'm doing something wrong. The question is... "One troy ounce of gold is worth $380. There are 33.8 grams per troy ounce. You have a stock colloidal solution of a

    asked by James on March 17, 2013
  73. Chemistry

    1. If an aqueous solution that is 0.15 M in HF has an osmotic pressure of 3.9 atm at 25oC, what is the percent ionization of HF at this concentration? 2. A mixture of 2 volatile liquids is said to be ideal if each component obeys Raoult’s Law: Pi=XiPio

    asked by Michelle on February 4, 2015
  74. 10th grade

    An unsaturated solution is made by completely dissolving 20.0 grams of NaNO3 in 100.0 grams of water at 20.0°C. (the gram formula mass=85.0 grams per mole) Determine the minimum mass of NaNO3 that must be added to this unsaturated solution to make a

    asked by R on December 25, 2009
  75. Analytical chemistry

    A solution is created using 2.1700 grams of Calcium Hydroxide (MW is 74.093) in a 1L volumetric flask. A 50 mL aliquot is then taken and aded to a 350 mL volumteric flask and filled to the line. Finally, a 10 aliquot of the that solution is taken and added

    asked by Sam on October 2, 2016
  76. Chemistry

    1) How many drops of 12M HCl would you add to 1.00 L of 0.100 M HC2H3O2 to make [C2H3O2-] = 1.0 x 10^-4 M? Assume that 1 drop = 0.050 mL and that the volume of the solution remains 1.00 L after the 12 M HCl is diluted. [Hint: What must be the [H3O+] in the

    asked by Chem on August 10, 2009
  77. Chemistry

    a class reacts 50.00ml samples of 0.200 mol/L potassium phosphate solution with an excess of 0.120 mol/L lead(II) nitrate solution. Which reagent is intended to be the limiting reagent, what is he minimum volume of lead II nitrate solution required. How do

    asked by tryme00 on April 1, 2012
  78. CHEMISTRY

    A solution of a metal carbonate M2CO3, was prepared by dissolving 7.46 g of the anhydrous solid in water to give 1000cm^3 of solution. 25.0cm^3 of this solution reacted with 27.0cm^3 of 0.100 mol/dm^3 hydrochloric acid. Calculate the relative formula mass

    asked by DAVID on July 9, 2016
  79. Chemistry

    A 25.00-mL sample of an H2SO4 (2 and 4 are subscripted) solution of unknown concentration is titrated with a .1328 M KOH solution. A volume of 38.33 mL of KOH was required to reach the endpoint. What is the concentration of the unknown H2SO4 (again, the 2

    asked by coug on January 4, 2010
  80. Chemistry

    A 25.00-mL sample of an H2SO4 (2 and 4 are subscripted) solution of unknown concentration is titrated with a .1328 M KOH solution. A volume of 38.33 mL of KOH was required to reach the endpoint. What is the concentration of the unknown H2SO4 (again, the 2

    asked by coug on January 4, 2010
  81. chemistry

    An aqueous solution is analyzed and found to contain potassium ions and sulfite ions. Write the equation for the dissolution of the salt that produced this solution. If the solution contains 0.600 mol of potassium ions, how many moles of sulfite ions are

    asked by lebanon on February 23, 2014
  82. chemistry

    5Fe(2+ charge) + MnO4(-1 charge) +8H(1+ charge) -> 5Fe(3+ charge) + Mn(2+ charge) + 4H2O In a titration experiment based on the equation above, 25ml of an Acidified Fe(2+ charge) solution requires 14 ml of standard .050 M MnO4(1- charge) solution to reach

    asked by corey on October 3, 2007
  83. Chemistry

    A saturated solution of lead ii trioxonitrte v was prepared at 22degree Celsius at 27cm3 of this solution required 46cm3 of NaCl solution containing 96gdm3 for complete precipitation. Find the solubility of the lead in trioxonitrte v at 22degree Celsius in

    asked by Mohammed on May 24, 2016
  84. Algebra

    Two more Algebra questions : Drawing a blank on this one, not sure where to start. Find the equation, in standard form, with all integer coefficients, of the line perpendicular to x + 3y = 12 and passing through (9, -5). I have half a solution to this one:

    asked by John on October 15, 2007
  85. chemistry

    Consider a buffer solution consisting of CH3NH3Cl and CH3NH2. Which of the following statements are true concerning this solution? (Ka for CH3NH3+ = 2.3 x 10 -11). 1. A solution consisting of 0.1 M CH3NH3Cl and 0.1 M CH3NH2 would be a more effective buffer

    asked by bekah on March 25, 2014
  86. chemistry

    I have a 0.25 m aquaeous solution of HCL. It's density is 1.05 g/ml. WHat is the % by mass (m/m) of this solution? What is the molarity of the solution? define molality. m = # mols/kg solvent. We have 0.25 m so we must have 0.25 x 36.5 g/mol HCl = 9.125 g

    asked by nancy on March 20, 2007
  87. science

    which is the correct balanced equation for a given titration process, (a) or (b)? a) 6H+ + 2MnO4- + 3H2O2 -> 4O2 + 2Mn2+ + 6H2O b) 6H+ + 2MnO4- + 5H2O2 -> 5O2 + 2Mn2+ + 8H2O Process: Make a solution in a 100mL volumetric flask using 1g of NaBO3*4H2O, 20mL

    asked by sarah on March 30, 2011
  88. astronomy

    An Extreme Ultrviolet imager telescope is used to observe the sun and corona.it has four filters which are sensitive to different wavelenghts of UV radiation.These are: filter: 17.1nm 19.5nm 28.4nm 30.4nm Question: which filters are most likely to be of

    asked by amy21 on March 5, 2008
  89. science

    If you were riding on a train, which of the following would look as if it is not moving? the conductor walking by you a building you are passing a flying bird

    asked by Anonymous on April 13, 2014
  90. chemistry

    What mass (in grams) of CaCl2(s) must be dissolved in pure water at 10.0 deg Celsius to make a 26.4 mL solution and to increase the solution temperature to 16.4 deg Celsius? Assume that there is no heat loss from the solution and that the solution has the

    asked by Anonymous on November 16, 2008
  91. chemistry URGENT (1)

    What mass (in grams) of CaCl2(s) must be dissolved in pure water at 10.0 deg Celsius to make a 26.4 mL solution and to increase the solution temperature to 16.4 deg Celsius? Assume that there is no heat loss from the solution and that the solution has the

    asked by Anonymous on November 16, 2008
  92. Chemistry

    1)A solution prepared by adding 0.400 mol of acetic acid (pKa = 4.74) and 0.400 mol of sodium acetate to 100.0 mL of water. The pH of this buffer solution is initially 4.74. Predict the final pH when 55.0 mL of 1.10 M NaOH is added to solution 2) A

    asked by Maya on December 1, 2016
  93. chemistry

    If a solution contains 255ml of ethanol in a 375 ml solution, what is the % of ethanol in that solution?

    asked by Twynna on January 28, 2011
  94. chemistry

    If a solution contains 255ml of ethanol in a 375 ml solution, what is the % of ethanol in that solution?

    asked by Twynna Andrews on January 26, 2011
  95. chem 215

    16.6 ml of a solution is run into an empty flask, from a buret. The mass of the empty flask is 145.0 g. The mass of the flask plus solution is 158.5 g. The density of the solution is _____ g/ml.

    asked by Anonymous on October 7, 2015
  96. Math

    A custodian pours1/8 gallon of cleaning solution into each pail of water that she uses. how many pails of water and cleaning solution can the custodian make using 16 gallons of cleaning solution?

    asked by Mel on March 25, 2015
  97. mathematics

    The solution below corresponds to an inequality involving a quartic function. Write a possible quartic polynomial inequality that matches the solution. Prove that your inequality matches the solution. x < 4 and x > 7

    asked by mack on January 7, 2018
  98. MATH

    The solution below corresponds to an inequality involving a quartic function. Write a possible quartic polynomial inequality that matches the solution. Prove that your inequality matches the solution. x < 4 and x > 7

    asked by ken on January 6, 2018
  99. ~ CHEMISTRY ~

    If k is a constant, how will a change in volume change the pressure? Choose one set of numbers. Assign one of them to represent P and the other to represent V. What happens to P if V is assigned the larger number? What happens to P if V is assigned the

    asked by Anonymous on March 25, 2016
  100. Differential Equations

    Consider the differential equation: dy/dt=y/t^2 a) Show that the constant function y1(t)=0 is a solution. b)Show that there are infinitely many other functions that satisfy the differential equation, that agree with this solution when t0 [Hint: you need to

    asked by Erica on January 31, 2013