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

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Given a 0.1 M solution of each of the following. Which solution has the lowest pH
A. `NaHSO_(4)`
B. `NH_(4)Cl`
C. HCl
D. `NH_(3)`
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Correct Answer - C
Because it is a strong acid.
`H^(+) = 10^(-1)`.
`pH = -log [H^(+)] = -log[10^(-1)] , pH = 1`.
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