Question

What is the pH of a buffer solution which contains 0.30M HC2H3O2 (acetic acid) mixed with...

What is the pH of a buffer solution which contains 0.30M HC2H3O2 (acetic acid) mixed with 1.80M NaC2H3O2 (sodium acetate)? (Use ka chart)

a. 5.53

b. 4.75

c. 3.97

d. 4.52

e. 4.98

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Answer #1

Ka value of CH3COOH = 1.8*10^-5

Now, pKa = -log(Ka) = -log(1.8*10^-5) = 4.7447

Given, [HC2H3O2] = 0.30 M, [NaC2H3O2] = 1.80 M

pH = pKa + log(NaC2H3O2/HC2H3O2)

= 4.7447 + log(1.80/0.30)

= 5.5228

= 5.53 ( nearly equal)

Correct option is a.

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