A pH of 5 is how many more times acidic than a pH of 6?

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Multiple Choice

A pH of 5 is how many more times acidic than a pH of 6?

Explanation:
pH is a logarithmic scale, so each one-unit drop in pH means a tenfold increase in hydrogen ion concentration. Moving from pH 6 to pH 5 increases acidity by a factor of 10. Numerically, [H+] at pH 6 is 1 × 10^-6 M and at pH 5 is 1 × 10^-5 M; the ratio is 10, so pH 5 is ten times more acidic than pH 6. If the difference were two pH units, acidity would be 100 times greater; three units would be 1000 times greater.

pH is a logarithmic scale, so each one-unit drop in pH means a tenfold increase in hydrogen ion concentration. Moving from pH 6 to pH 5 increases acidity by a factor of 10. Numerically, [H+] at pH 6 is 1 × 10^-6 M and at pH 5 is 1 × 10^-5 M; the ratio is 10, so pH 5 is ten times more acidic than pH 6. If the difference were two pH units, acidity would be 100 times greater; three units would be 1000 times greater.

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