An acid solution of pH = 6 is diluted 1000 times, the pH of the final solution becomes

Question

An acid solution of pH = 6 is diluted 1000 times, the pH of the final solution becomes, 6.01, 9, 3.5, 6.99

MARKS App · Accepted Answer

∵ pH = 6 ∴ H + = 10 - 6 M After dilution H + = 10 - 6 1000 = 10 - 9 M ∴ [ H + ] from H 2 O cannot be neglected. Total H + = 10 - 9 + 10 - 7 (neglect common ion effect on H 2 O ) = 10 - 7 10 - 2 + 1 = 10 - 7 ( 1.01 ) p H = - log ⁡ 1.01 × 10 - 7 = 7 - 0.0043 = 6.9957

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