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Question
The dissociation constant of acetic acid and aniline are 1.8×10−5 and 4.2×10−10 respectively. What is the pH of the solution?
The dissociation constant of acetic acid and aniline are 1.8×10−5 and 4.2×10−10 respectively. What is the pH of the solution?
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Solution
The correct option is A 4.684
Aniline acetate is a salt of weak acid and weak base, its degree of hydrolysis may be calculated as - α=√Kh and Kh=KwKa×Kb
Substituting given values we get, α=1.15 which is not possible.
Hence to avoid approximation we take, α1−α=√Kh
pH after hydrolysis may be calculated as:
pH=12[pKw+pKa−pKb]=12[14+4.774−9.3767]=4.684
Aniline acetate is a salt of weak acid and weak base, its degree of hydrolysis may be calculated as - α=√Kh and Kh=KwKa×Kb
Substituting given values we get, α=1.15 which is not possible.
Hence to avoid approximation we take, α1−α=√Kh
pH after hydrolysis may be calculated as:
pH=12[pKw+pKa−pKb]=12[14+4.774−9.3767]=4.684
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