Hydrogen ion activity can be expressed as which of the following?
a. pH = log10[H–] c. pH = –log10[H+]
b. [H+] = log ? 10 d. pH = 1 ? 10?7 mol/L
ANS: C
Sorenson introduced the term pH as a shorthand way to express the hydrogen ion activity of so-lutions. It is defined as the negative logarithm (base 10) of the hydrogen ion concentration, or pH = –log10[H+].
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