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    Question

    At pH 9.0 of alkali soil, the concentration of OH– is

    A 10ˉ⁵ mole/litre Correct Answer Incorrect Answer
    B 10ˉ⁷ mole/litre Correct Answer Incorrect Answer
    C 10ˉ⁶ mole/litre Correct Answer Incorrect Answer
    D 10ˉ⁸ mole/litre Correct Answer Incorrect Answer

    Solution

    In a solution at pH 9.0, the concentration of OH⁻ ions is 10–5 mole/litre, which can be calculated using the relationship pOH=14−pHpOH=14−pH and [OH−]=10−pOH[OH−]=10−pOH.

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