Under what condition is the OH^- ion concentration in water expected to be zero?

A. In a solution of strong acid
B. In a solution of strong base
C. In a solution of weak base
D. never

ion is also referred to as Hydroxide ion.

This correct option is option D because there is never a condition where the   ion concentration in water is expected to be zero.

As long as this reaction keeps on happening, the concentration of in the water will never be zero.

Therefore, the correct option is D.

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Never

Explanation:

The OH⁻ ion in a sample of water comes from the process of autoionization of water. That is, water reacts with itself to give the hydronium ion (H₃O+) and hydroxide ion (OH⁻). The reaction for this process is H₂O + H₂O ⇄ H³O⁺ + OH⁻. As long as there are at least two molecules of water, the process will occur giving hydroxide ions.