Question

Calculate the pH of the following two buffer solutions: (a) 2.4 M CH3COONa/1.3 M CH3COOH. (b)...

Calculate the pH of the following two buffer solutions:

(a) 2.4 M CH3COONa/1.3 M CH3COOH.

(b) 0.2 M CH3COONa/0.1 M CH3COOH.

(C) Which is the more effective buffer?

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Homework Answers

Answer #1

a. PH   = PKa + log[CH3COONa]/[CH3COOH]

          = 4.75+ log2.4/1.3

         = 4.75 + 0.2662

          = 5.0162

b. PH   = PKa + log[CH3COONa]/[CH3COOH]

          = 4.75+ log0.2/0.1

         = 4.75 + 0.3010

          = 5.051

c. 0.2 M CH3COONa/0.1 M CH3COOH more effect buffer

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