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What is pH?

a. The negative logarithm of the hydrogen ion concentration
b. The positives logarithm of the hydrogen ion concentration
c. The negative logarithm of the hydroxide ion concentration
d. The positive logarithm of the hydroxide ion concentration

User Easeout
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1 Answer

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pH = -log[H+]
That is, pH is the negative logarithm of the hydrogen ion concentration.

pOH = -log[OH-]
pOH is the negative logarithm of the hydroxide ion concentration.

The correct answer to your question is a. The negative logarithm of the hydrogen ion concentration.
User Iskander
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