A 0.010 M solution of a strong acid (HCl) has what pH?

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Multiple Choice

A 0.010 M solution of a strong acid (HCl) has what pH?

Explanation:
When a strong acid like HCl dissolves in water, it dissociates completely, so the hydrogen ion concentration [H+] equals the initial acid concentration. Here, [H+] = 0.010 M = 1.0×10^-2 M. The pH is defined as pH = -log10([H+]). So pH = -log10(1.0×10^-2) = 2.00. This shows that a more concentrated strong acid has a lower pH, and in this case the solution’s pH is 2.00.

When a strong acid like HCl dissolves in water, it dissociates completely, so the hydrogen ion concentration [H+] equals the initial acid concentration. Here, [H+] = 0.010 M = 1.0×10^-2 M. The pH is defined as pH = -log10([H+]). So pH = -log10(1.0×10^-2) = 2.00. This shows that a more concentrated strong acid has a lower pH, and in this case the solution’s pH is 2.00.

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