Which ion H₃O⁺ or OH⁻, is in greater concentration?

The OH- ion concentration is greater than the H3O+ ion concentration.

Explanation:

For a basic solution it is the OH- ion that is in greater concentration

For an acidic solution, it's the H3O + ion that's in greater concentration

An acid or base that is a weak electrolyte is only partially ionized in water.

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