10^{-6} M HCl is diluted 100 times. Its pH | vedclass

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(C) Initial concentration of $HCl = 10^{-6} \ M$. After dilution by $100$ times,the concentration of $HCl$ becomes $10^{-6} / 100 = 10^{-8} \ M$. Sinc

Vedclass · Accepted Answer

$6.95$

Vedclass · Answer

(C) Initial concentration of $HCl = 10^{-6} \ M$. After dilution by $100$ times,the concentration of $HCl$ becomes $10^{-6} / 100 = 10^{-8} \ M$. Since $HCl$ is a strong acid,it provides $[H^+]_{acid} = 10^{-8} \ M$. Water also contributes $[H^+]_{water} = 10^{-7} \ M$. Total $[H^+] = [H^+]_{acid} + [H^+]_{water} = 10^{-8} + 10^{-7} = 10^{-7}(0.1 + 1) = 1.1 	imes 10^{-7} \ M$. $pH = -\log[H^+] = -\log(1.1 	imes 10^{-7}) = 7 - \log(1.1) = 7 - 0.0414 = 6.9586 \approx 6.96$.

$10^{-6} \ M \ HCl$ is diluted $100$ times. Its $pH$ is

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