A solution is prepared by dissolving 50.0 g of pure HC2H3O2 and 20.0 g of NaC2H3O2 in 975 mL of solution (the final volume).

what is the ph?

What would the pH of the solution be if 50.0 mL of 0.900 M NaOH were added?

What would the pH be if 30.0 mL of 0.30 M HCl were added to the original 975 mL of buffer solution?

Please help I have tried using the Henderson Hasselbach equation and I am not getting the correct answer.

  1. 👍 0
  2. 👎 0
  3. 👁 566
  1. Show your work and I'll guide you through it.
    First, just the pH of the solution.

    1. 👍 0
    2. 👎 0
  2. I multiplied 50g by 975 mL and then 20g by 975 mL. Then I used the given pKa of 4.745 + log (19,500 / 48,750) = 4.35

    1. 👍 0
    2. 👎 0
  3. Thos are molarities that go in the HH equation.
    mols HAc = 50/molar mass HAc
    M HAc = mols/0.975L = ?

    mols NaAc = 20/molar mass NaAc.
    M NaAc = mols/0.975
    pH = pKa + log b/a
    I get close to 4.2 but that approximate.
    By the way you can take a shortcut and use mols base/mols acid and obtain the same answer as if you used M base/M acid. That's because the 975 mL cancels.

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. chemistry

    •Which of the following solutions will be the best buffer at a pH of 9.26? (Ka for HC2H3O2 is 1.8 x 10–5; Kb for NH3 is 1.8 x 10–5.) a)0.20 M HC2H3O2 and 0.20 M NaC2H3O2 b)3.0 M HC2H3O2 and 3.0 M NH4Cl c)0.20 M NH3 and 0.20

    asked by anita on January 4, 2015
  2. Chemistry

    The pH of a solution prepared by mixing 55.0 mL of 0.183 M KOH and 10.0 mL of 0.145 M HC2H3O2 is ________. the answer is 13.122 however when i try to plug it into the Henderson Hasselbalch equation (pH= -log(1.8E-5)+log(

    asked by Lubna on August 9, 2018
  3. chemistry! URGENT

    A standard solution is prepared for the analysis of fluoxymesterone (C20H29FO3), an anabolic steroid. A stock solution is first prepared by dissolving 10.0 mg of fluoxymestrone in enough water to give a total volume of 500.0 ml. A

    asked by Lindsay on December 7, 2011
  4. chem

    1. What is the [K+] of a solution prepared by dissolving 0.140 g of potassium hydroxide in sufficient pure water to prepare 250.0 ml of solution? 2. What is the pH of a 0.570 M solution of aniline? Kb = 7.4 × 10-10

    asked by nelson on March 31, 2008
  5. chemistry

    A buffer is made by dissolving HC2H3O2 and NaC2H3O2 in water. Write an equation that shows how this buffer neutralizes added acid. Express your answer as a chemical equation. Identify all of the phases in the answer.

    asked by amanda on December 3, 2012
  1. chemistry... please help!

    Pure glacial acetic acid HC2H3O2 has a freezing point of 16.62 degrees C. Its freezing point depression constant is Kf=3.57 Cm^-1. A solution was made by taking 9.755 g of an unknown non-electrolyte and dissolving it in 90.50 g of

    asked by Anonymous on February 13, 2009
  2. chemistry

    A solution was prepared by dissolving 0.834 g of sulfur, S8, in 100.0 g of acetic acid, HC2H3O2. Calculate the freezing point and boiling point of the solution. (Use the table from the textbook.)

    asked by george on April 15, 2013
  3. Chemistry

    What is the molarity of this dichromate solution? A potassium dichromate solution of an unknown molarity was used to titrate a solution of FeSO4 prepared by dissolving a 0.350g of pure iron wire in H2SO4 and reducing the FE3+

    asked by ANONYMOUS on December 2, 2012
  4. chemistry

    What is the pH of a solution prepared by dissolving 12.2 g of benzoic acid in enough water to produce a 500 mL solution?

    asked by Andrea on May 13, 2012
  5. physical chemistry

    How many grams of NaC2H3O2 (M = 82.034 g mol-1) should be dissolved in 400.0 g of water to prepare a solution which is 11.28 % NaC2H3O2 by mass?

    asked by shafika on January 30, 2010

You can view more similar questions or ask a new question.