A solution with pH 3 is compared to pH 5; what is the factor of acidity difference?

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Multiple Choice

A solution with pH 3 is compared to pH 5; what is the factor of acidity difference?

Explanation:
The concept tested is how pH relates to hydrogen ion concentration. pH is a negative logarithm of [H+], so each unit change in pH represents a tenfold change in acidity. A solution at pH 3 has [H+] = 1×10^-3 M, while a solution at pH 5 has [H+] = 1×10^-5 M. The difference in acidity is the ratio of these concentrations: (1×10^-3) / (1×10^-5) = 100. So the pH 3 solution is 100 times more acidic than the pH 5 solution.

The concept tested is how pH relates to hydrogen ion concentration. pH is a negative logarithm of [H+], so each unit change in pH represents a tenfold change in acidity. A solution at pH 3 has [H+] = 1×10^-3 M, while a solution at pH 5 has [H+] = 1×10^-5 M. The difference in acidity is the ratio of these concentrations: (1×10^-3) / (1×10^-5) = 100. So the pH 3 solution is 100 times more acidic than the pH 5 solution.

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