# Chemistry: Buffer Intensity problem

You wish to prepare a pH 4.76 acetic acid sodium acetate buffer with a buffer intensity of 1 M per pH. What concentrations of acetic acid and sodium acetate are needed?

1. 👍 0
2. 👎 0
3. 👁 103
1. I assume 1 M/pH means 1 mol in a liter for a pH of 1.0

First, determine the ratio of base(b) to acid(a).
4.76 = 4.76 + log (b/a)
b/a = 1 or b=a initially. You should confirm that.

Than make an ICE table. We will work this backwards since we want to know how much to start with. We will call the amount we start with x. Since b = a then both will be x
....HAc + OH^- ==> Ac^- + H2O
I....x....0........x......
C...-1...-1........+1
E...x-1...0.......x+1

Now plug the E line into the HH equation and solve for x. The pH will be 5.76 (for the pH change of 1)
5.76 = 4.76 + log[(x+1)/(x-1)]
x = ? I calculated 1.22 mols/L but you should confirm that AND you should make an ICE table starting with 1.22 M with HAc and Ac^- and see if that gives you a 5.76. If it does that means that amount of HAc and Ac^- will provide enough material to allow 1 mol/L NaOH to be added and the pH will not rise above 5.76.

1. 👍 1
2. 👎 0

## 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. ### Chemistry

If you need to prepare 250.0 mL of a pH 5.00 buffer that has a total buffer concentration of acetic acid + sodium acetate of 0.050M, how many moles of each will you need to prepare the solution? Given solutions of acetic acid and

asked by Natalie on November 11, 2013
3. ### Chem

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? Given solutions of acetic acid

asked by Nathaly on March 19, 2017
4. ### 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? Given solutions of acetic acid

asked by cody on March 21, 2017
5. ### Chemistry

You want to prepare a pH=4.50 buffer using sodium acetate and glacial acetic acid. You have on hand 300 mL of 0.100 M sodium acetate. How many grams of glacial (water free) acetic acid should you add to prepare the buffer? (Ka of

asked by Amanda on May 24, 2012
6. ### Biochemistry

Susie is instructed to prepare 400mL of a 0.3M acetate buffer of pH=4.44, and she is given sodium acetate trihydrate and glacial acetate acid (99% by weight, density=1.05 g/mL0. Susie can't figure out what to do! How should she

asked by brittany on January 23, 2008
7. ### Food Chemistry

Calculate the amounts and pH values for preparing the following acetic acid/acetate buffer solution. 1.) In the first step, If you plan to prepare a 2.00 M sodium acetate in 200.0 mL distilled water, how many grams of sodium

asked by Lauren on April 29, 2010
8. ### 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

asked by Anonymous on July 21, 2017
9. ### chemistry

If you add 5.0 mL of 0.50 M NaOH solution to 20.0 mL to Buffer C, what is the change in pH of the buffer? (where buffer C is 8.203 g sodium acetate with 100.0 mL of 1.0 M acetic acid) I have calculated the pH of buffer C to be

asked by Chelsea on November 7, 2010
10. ### Chemistry

You want to prepare a pH=4.50 using sodium acetate and glacial acetic acid. You have n hand 300 mL of 0.100 M sodium acetate. How many grams of glacial acetic acid should you add to prepare the buffer? (Ka of acetic acid is 1.8e-5

asked by Amanda on May 24, 2012

More Similar Questions