At a pH of 7.70, the H+ concentration is equal to

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Multiple Choice

At a pH of 7.70, the H+ concentration is equal to

Explanation:
The concept being tested is how pH relates to hydrogen ion concentration. pH is the negative logarithm (base 10) of the hydrogen ion concentration: pH = -log10[H+]. So the hydrogen ion concentration is [H+] = 10^(-pH). At pH 7.70, [H+] = 10^(-7.70) M, which is about 2.0 × 10^-8 M. To express this in nanomoles per liter, multiply by 1 × 10^9 (since 1 M = 1 × 10^9 nM): 2.0 × 10^-8 × 1 × 10^9 ≈ 20 nmol/L. So the hydrogen ion concentration is approximately 20 nmol/L.

The concept being tested is how pH relates to hydrogen ion concentration. pH is the negative logarithm (base 10) of the hydrogen ion concentration: pH = -log10[H+]. So the hydrogen ion concentration is [H+] = 10^(-pH).

At pH 7.70, [H+] = 10^(-7.70) M, which is about 2.0 × 10^-8 M. To express this in nanomoles per liter, multiply by 1 × 10^9 (since 1 M = 1 × 10^9 nM): 2.0 × 10^-8 × 1 × 10^9 ≈ 20 nmol/L.

So the hydrogen ion concentration is approximately 20 nmol/L.

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