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The hydrogen or hydronium concentration of a strong monoprotic acid at equilibrium is equal to the initial concentration of the acid.
[tex]\begin{aligned} \text{pH} & = -\text{log} \: [\text{H}^+] \\ & = -\text{log} \: (0.0075) \\ & = \boxed{2.12} \end{aligned}[/tex]
Hence, the pH of a 0.0075 M solution of HCl is 2.12.
[tex]\\[/tex]
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