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Q.

What is the pH of a 1 M CH3COOH a solution Ka of acetic acid = 1.8 ×  10-5 ?K = 10-14 mol2 litre-2

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a

9.4

b

4.8

c

3.6

d

2.4

answer is A.

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Detailed Solution

CH3COO-  +  H2O  ⇌     CH3COOH  +  OH-OH- = c × h;    h = KwKa × c = 10-141.8 ×10-5 ×1 =2.35 × 10-5 ∴   pOH=4.62;   pH = 9.38  ≈  9.4
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