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
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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