What is the negative logarithm of hydrogen ion concentration called?

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Multiple Choice

What is the negative logarithm of hydrogen ion concentration called?

Explanation:
pH is the negative logarithm of the hydrogen ion concentration. By definition, pH = -log10[H+], so the scale is logarithmic: a one-unit change corresponds to a tenfold change in [H+]. Lower pH means more acidic (higher [H+]), neutral is about 7, and higher pH means more basic. The relation pH + pOH ≈ 14 at 25°C connects it to the hydroxide ion concentration, since pOH = -log10[OH-]. Acidity and basicity describe how substances behave in donating or accepting protons, but the numeric measure of how acidic a solution is, on a standard scale, is pH.

pH is the negative logarithm of the hydrogen ion concentration. By definition, pH = -log10[H+], so the scale is logarithmic: a one-unit change corresponds to a tenfold change in [H+]. Lower pH means more acidic (higher [H+]), neutral is about 7, and higher pH means more basic. The relation pH + pOH ≈ 14 at 25°C connects it to the hydroxide ion concentration, since pOH = -log10[OH-]. Acidity and basicity describe how substances behave in donating or accepting protons, but the numeric measure of how acidic a solution is, on a standard scale, is pH.

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