Question

why do we depend on ph values instead of H + ion concentration?​

Answer 1

The lower the pH, the higher the concentration of hydrogen ions, [H+]. The lower the pKa, the stronger the acid and the greater its ability to donate protons. pH depends on the concentration of the solution. This is important because it means a weak acid could actually have a lower pH than a diluted strong acid.

Answer 2

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pH values not only tell us the substance is acidic or basic but also tells us the amount of acidic and basic more clearly than H + ion concentration........