The pH value of which one of the following is | vedclass

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(A) For a solution to have $pH = 1$,the concentration of $[H^+]$ must be $0.1 \ M$.$(A)$ $0.1 \ M \ CH_3COOH$ is a weak acid and does not dissociate c

Vedclass · Accepted Answer

$0.1 \ M \ CH_3COOH$

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(A) For a solution to have $pH = 1$,the concentration of $[H^+]$ must be $0.1 \ M$.$(A)$ $0.1 \ M \ CH_3COOH$ is a weak acid and does not dissociate completely,so $[H^+]  1$.$(B)$ $0.1 \ M \ HNO_3$ is a strong acid,$[H^+] = 0.1 \ M$,so $pH = -\log(0.1) = 1$.$(C)$ $0.05 \ M \ H_2SO_4$ is a strong acid,$[H^+] = 2 	imes 0.05 = 0.1 \ M$,so $pH = -\log(0.1) = 1$.$(D)$ For the mixture: $n(H^+) = 50 	imes 0.4 = 20 \ mmol$,$n(OH^-) = 50 	imes 0.2 = 10 \ mmol$. Remaining $n(H^+) = 20 - 10 = 10 \ mmol$. Total volume = $100 \ cm^3$. $[H^+] = 10 / 100 = 0.1 \ M$,so $pH = 1$.

The $pH$ value of which one of the following is not equal to $1$?

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