Chemistry

posted by .

I have a 1L solution of 0.02M sodium acetate and 0.02M acetic acid. What is the pH after the addition of 0.05 moles of hydrochloric acid?

I know this is a buffer question but I have no idea how I am supposed to go about getting the answer... I know Ka values for acetic acid, but I still can't get anywhere.

  • Chemistry -

    What happens in a buffered solution when HCl is added? The acetate ion combines with H of the strong acid to form acetic acid, thus making a weak acid out of a strong acid. If we let Ac^- stand for acetate and HAc acetic acid, the equation you have is
    Ac^- + H^+ ==> HAc
    So look at the moles H^+ added from HCl. The moles HAc will be increased by the moles H^+ added (from the HCl) and the moles of Ac^- will be decreased by that same amount. Then plug in these new moles for base and acid in the Henderson-Hasselbalch equation and you have it.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Chemistry

    I did an experiment on Buffers: In a polystyrene beaker, mix 20 ml of 0.1M Acetic acid ad 25 ml of 0.1 M sodium acetate and immediately measure the pH. Remove the electrode and add 5 ml of 0.1 M HCL to this buffer. Stir the solution …
  2. Chemistry

    IN the polystyrene beaker, mix 20mL of 0.1 M Acetic acid and 25mL of 0.1M Sodium Acetate and immediately measure the pH. Remove the electrode and add 5ml of 0.1 M HCl to this buffer. Stir the solution and measure the pH. _______________ …
  3. College Chemistry

    A buffer solution contains 0.120M acetic acid and 0.150M sodium acetate. a. How many moles of acetic acid and sodium acetate are present in 50.0 ml of solution?
  4. Chemistry 122

    A solution is prepared to be 0.10 M acetic acid, HC2H3O2, and 0.20 M sodium acetate, NaC2H3O2. What is the pH of this buffer?
  5. school

    What is the pH of 0.1 M formic acid solution?
  6. chem

    Which of the following could be added to a solution of sodium acetate to produce a buffer?
  7. Biochem

    You have prepared a 400 mL of a .210 M acetate buffer solution with a pH of 4.44. 1. Determine the concentration of both the acetate and acetic acid in the solution. 2. If you made this solution using solid sodium acetate (MW = 136 …
  8. chemistry

    If you need to prepare 250.0 mL of a pH 5.00 buffer tha t has a total buffer concentration of acetic acid + sodium acetate of 0.050 M, how many moles of each will you need to prepare the solution?
  9. chemistry

    You have made a buffer solution where you added 9 mL 1M Acetic Acid and 0.82 grams Sodium Acetate and diluted it with deionized water to 100 mL. If the Ka for Acetic Acid is 1.76*10-5 and the molecular weight of Sodium Acetate is 82.03 …
  10. Chemistry

    An acetic acid buffer solution is required to have a pH of 5.27. You have a solution that contains 0.01 mol of acetic acid. How many moles of sodium acetate will you need to add to the solution?

More Similar Questions