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The $pH$ of a dilute solution of acetic acid was found to be 4:3. The addition of a small crystal of sodium acetate will cause $pH$ to

(a) become less than 4.3

(b) become more than 4.3

(c) remain equal to 4.3

(d) unpredictable

1 Answer

Answer: become more than 4.3
$CH_3COONa$ being strong electrolyte ionises into $CH_3COO^-$ and $Na^+$ ions and it supresses the ionisation of $CH_3COOH$
$CH_3COOH \rightleftharpoons CH_3COO^- + H^+$
thereby decreasing the $H^+$ ion concentration. This thereby would cause $pH$ to increase beyond 4.3.


answered Nov 27, 2013 by mosymeow_1

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