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Given pH = 12 [H⁺] = 10⁻¹² [OH⁻] = 10⁻²

1. 10⁻¹²
2. 10⁻²
3. 10⁻⁴
4. None of these

Correct answer: 10⁻²

Solution

The pH is given as 12, so [H⁺] = 10⁻¹². Using the relation pH + pOH = 14, pOH = 2, and [OH⁻] = 10⁻². Thus, the correct answer is 10⁻².

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