pH of HCl (10^{-12} M) is | vedclass

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(C) The concentration of $HCl$ is $10^{-12} \ M$,which is extremely dilute. In such cases,the contribution of $H^+$ ions from the auto-ionization of w

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$\approx 7$

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(C) The concentration of $HCl$ is $10^{-12} \ M$,which is extremely dilute. In such cases,the contribution of $H^+$ ions from the auto-ionization of water $(10^{-7} \ M)$ cannot be ignored. Total $[H^+] = [H^+]_{HCl} + [H^+]_{H_2O} = 10^{-12} + 10^{-7} \approx 10^{-7} \ M$. Therefore,$pH = -\log[H^+] = -\log(10^{-7}) = 7$. Since the solution is acidic,the $pH$ will be slightly less than $7$ (approximately $6.99$). Thus,the correct option is $C$.

$pH$ of $HCl$ $(10^{-12} \ M)$ is

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