Which statement about the pH scale is true?

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Multiple Choice

Which statement about the pH scale is true?

Explanation:
The pH scale is a logarithmic measure of hydrogen ion concentration in water, defined by pH = -log[H+]. This makes the neutral point at pH 7, since pure water at 25°C has equal [H+] and [OH−] of 1×10−7 M. Each unit change in pH represents a tenfold change in acidity or basicity. Under standard conditions, the conventional range is 0 to 14: values below 7 are acidic, values above 7 are basic, and 7 is neutral. The statement that the scale ranges from 0 to 14 is the true one. Choices that set a narrower range or include negative pH or pH values above 14 as common aren’t accurate for typical conditions; extremely strong acids can produce very low pH and highly concentrated bases can push pH above 14 only under uncommon circumstances.

The pH scale is a logarithmic measure of hydrogen ion concentration in water, defined by pH = -log[H+]. This makes the neutral point at pH 7, since pure water at 25°C has equal [H+] and [OH−] of 1×10−7 M. Each unit change in pH represents a tenfold change in acidity or basicity. Under standard conditions, the conventional range is 0 to 14: values below 7 are acidic, values above 7 are basic, and 7 is neutral. The statement that the scale ranges from 0 to 14 is the true one. Choices that set a narrower range or include negative pH or pH values above 14 as common aren’t accurate for typical conditions; extremely strong acids can produce very low pH and highly concentrated bases can push pH above 14 only under uncommon circumstances.

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