The pH of a solution is defined as:

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Multiple Choice

The pH of a solution is defined as:

Explanation:
The pH is defined as the negative base-10 logarithm of the hydrogen ion concentration, so pH = -log10[H+]. This makes pH a logarithmic measure of acidity: larger [H+] gives a smaller pH, and every tenfold change in [H+] changes pH by 1 unit. For example, neutral water at 25°C has [H+] = 1×10^-7 M, giving pH = 7. The negative log of [OH-] is pOH, not pH, and the product [H+][OH-] is Kw, the ion-product of water, which remains constant at a given temperature.

The pH is defined as the negative base-10 logarithm of the hydrogen ion concentration, so pH = -log10[H+]. This makes pH a logarithmic measure of acidity: larger [H+] gives a smaller pH, and every tenfold change in [H+] changes pH by 1 unit. For example, neutral water at 25°C has [H+] = 1×10^-7 M, giving pH = 7. The negative log of [OH-] is pOH, not pH, and the product [H+][OH-] is Kw, the ion-product of water, which remains constant at a given temperature.

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