What is the pH of a solution whose H+ ion concentration is 1 x 10^-2 mole per liter?

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Multiple Choice

What is the pH of a solution whose H+ ion concentration is 1 x 10^-2 mole per liter?

Explanation:
pH is found from the negative logarithm of the hydrogen ion concentration: pH = -log10[H+]. If [H+] = 1 x 10^-2 M, then log10[H+] = log10(1 x 10^-2) = -2, so pH = -(-2) = 2. This corresponds to an acidic solution with 0.01 M hydrogen ions. The other values would require different [H+]: pH 7 would need 1 x 10^-7 M, pH 12 would need 1 x 10^-12 M, and pH 0 would need 1 M. Therefore, the solution’s pH is 2.

pH is found from the negative logarithm of the hydrogen ion concentration: pH = -log10[H+]. If [H+] = 1 x 10^-2 M, then log10[H+] = log10(1 x 10^-2) = -2, so pH = -(-2) = 2. This corresponds to an acidic solution with 0.01 M hydrogen ions. The other values would require different [H+]: pH 7 would need 1 x 10^-7 M, pH 12 would need 1 x 10^-12 M, and pH 0 would need 1 M. Therefore, the solution’s pH is 2.

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