The concentration of H+ ions in a solution with a pH value of 4 is how many times as great as the concentration of H+ ions in a solution with a pH value of 7 ?

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BlackTom AI · Accepted Answer

The question compares the hydrogen ion concentration between two solutions with different pH values. Since pH is the negative logarithm (base 10) of the H+ concentration, each unit change in pH represents a tenfold change in [H+].

First, identify the pH difference: 7 − 4 = 3 units. A difference of 3 pH units corresponds to a factor of 10^3 in H+ concentration.

Therefore, the solution with pH 4 has 10^3, or 1000, times more H+ ions than the solution with pH 7.

If there were multiple-choice options, the correct option would be the one indicating 1000 as the ratio of [H+] between the two solutions. The reasoning relies on the definition of pH and the logarithmic relationship to hydrogen ion concentration, where each unit decrease in pH increases [H+] by a factor of 10, and a three-unit decrease yields a 1000-fold increase.

Note: Since the answer options are not provided in the data, this analysis focuses on the fundamental concept and the numeric result that 1000 is the correct ratio between the two concentrations.

AP Environmental Science-Hendricks-T2-2025 APES Unit 7 Exam MC

The concentration of H+ ions in a solution with a pH value of 4 is how many times as great as the concentration of H+ ions in a solution with a pH value of 7 ?

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