chemistry

1. Calculate pH of an acetate buffer containing 27.5 mM acetic acid (pKa is 4.74) and 50 mM sodium acetate. When a 30 mM aq solution of sodium acetate was prepared in the lab it had a pH of 8.8. Calculate the amount of acetic acid (in g) to be added to 0.5 L of this sodium acetate solution in order to bring its pH to the target value of 5.00.

1. 0
2. 0
3. 25
1. a. pH = 4.74 + log(base)/(acid) = approx 5.00

b.
millimoles NaAc = mL x M = 500 mL x 0.030M = = 15 mmoles.
5.00 = 4.74 + lot (15/x)
Solve for x = millimoles acetic acid and convert that to grams in 500 mL solution.

1. 0
2. 0
posted by DrBob222
2. Thank you :)

1. 0
2. 0
posted by Nick

Similar Questions

1. school

What is the pH of 0.1 M formic acid solution? Ka=1.7„e10-4? What is the pH value of buffer prepared by adding 60 ml of 0.1 M CH3COOH to 40 ml of a solution of 0.1 M CH3COONa? What is the pH value of an acetate buffer (pK=4.76)

asked by alshammari on December 11, 2011
2. organic chem

. Use the Henderson-Hasselbach equation: pH = pKa + log [A-]/[AH], where A- is the conjugate base and AH is the weak acid. Calculate the pH of an acetate buffer in which the acetate concentration [CH3COO-] is 3.5 times greater

asked by meghan on February 8, 2013
3. org. chem

How to start these problems out: Please help thank you Use the Henderson-Hasselbach equation: pH = pKa + log [A-]/[AH], where A- is the conjugate base and AH is the weak acid. Calculate the pH of an acetate buffer in which the

asked by meghan on February 8, 2013
4. CHEMISTRY

Calculate the amount (in mL) of 1.520M NaOH that is required to add the following acetic acid solution to prepare a buffer with the corresponding pH: 30.00mL of a 5.00% (w/v%) acetic acid; the resulting acetate buffer has a pH of

asked by Jeff on February 18, 2016
5. Chemistry

Calculate the volume of 1.00 M acetic acid solution and mass of sodium acetate needed to make 250 mL of a 0.450 M acetic acid/acetate buffer solution with a pH of 4.00. (The pKa is 4.74 for acetic acid) *Please explain it in

asked by Joseph on November 4, 2014
6. chemistry

Calculate the volume of 1.00 M acetic acid solution and mass of sodium acetate needed to make 250 mL of a 0.450 M acetic acid/acetate buffer solution with a pH of 4.00. (The pKa is 4.74 for acetic acid).

asked by eddie on November 3, 2014
7. Chemistry

Starting with 1.0M acetic acid and 0.50M NaOH, how would you prepare 100ml of 0.10M acetate buffer , pH =4.50? pKa of acetic acid is 4.74 (abbreviations : acetic acid = HAc,Acetate =Ac- )

asked by Muffin on March 21, 2011
8. Chemistry

Calculate pH of an acetate buffer containing 27.5 mM acetic acid (pKa is 4.74) and 50 mM sodium acetate. When a 30 mM aq solution of sodium acetate was prepared in the lab it had a pH of 8.8. Calculate the amount of acetic acid

asked by Sarah on April 12, 2014
9. CHEMISTRY HELP

Calculate the amount (in mL) of 1.520M NaOH that is required to add the following acetic acid solution to prepare a buffer with the corresponding pH: 30.00mL of a 5.00% (w/v%) acetic acid; the resulting acetate buffer has a pH of

asked by Mike on February 19, 2016
10. 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.

asked by Saira on March 28, 2010

More Similar Questions