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(C) $HCl$ is a strong acid that dissociates completely in water.For a $0.1 \ M$ solution of $HCl$,the concentration of hydrogen ions is $[H^{+}] = 0.1

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$HCl$

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(C) $HCl$ is a strong acid that dissociates completely in water.For a $0.1 \ M$ solution of $HCl$,the concentration of hydrogen ions is $[H^{+}] = 0.1 \ M = 10^{-1} \ M$.The $pH$ is calculated as $pH = -\log [H^{+}] = -\log [10^{-1}] = 1$.In contrast,$NaHSO_4$ is a weak acid,$NH_4Cl$ is a salt of a weak base and strong acid (acidic but weaker than $HCl$),and $NH_3$ is a weak base (basic,$pH > 7$).Therefore,$HCl$ has the lowest $pH$.

Given a $0.1 \ M$ solution of each of the following. Which solution has the lowest $pH$?

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