Every increase of one pH unit indicates ______________.

Question

BlackTom AI · Accepted Answer

Consider what a pH unit change means for hydrogen ion concentration. A higher pH indicates fewer hydrogen ions in solution, since pH is a log scale of [H+].
Option 1 asserts that there is an increase in acidity with a pH rise; in reality, increasing pH reduces acidity, so this is inconsistent with the definition of pH.
Option 2 claims there are 10 times more hydrogen ions when pH goes up by 1 unit; this contradicts the fundamental relationship between pH and [H+], where increasing pH lowers [H+].
Option 3 states there are 10 times less hydrogen ions in solution for each unit increase in pH. This aligns with the log-scale behavior: a one-unit increase corresponds to a tenfold decrease in [H+].
Option 4 suggests 10 times less hydroxide ions, which would be true if the statement were about pOH or basicity, but the prompt is about hydrogen ions; thus this option misinterprets the effect on [H+].

Every increase of one pH unit indicates ______________.

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