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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)
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)
= 5.53 ( nearly equal)
Correct option is a.
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