The pH of coffee is approximately 5.0. How many times greater is the [H₃O⁺] in coffee than in tap water having a pH of 8.0 A) 0.62 B) 1.6 C) 30 D) 1,000 E) 1.0 * 10⁴

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Quizplus · Accepted Answer

The pH scale is logarithmic, meaning a difference of 1 pH unit corresponds to a tenfold difference in hydrogen ion concentration ([H+]). The difference between pH 5.0 and pH 8.0 is 3 pH units, so the [H+] in coffee (pH 5.0) is 10^3 or 1,000 times greater than in tap water (pH 8.0).

The PH of Coffee Is Approximately 5