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What is pOH of an aqueous solution with hydrogen ion concentration equal to `3xx10^(-5)" mol L"^(-1)`?

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What is pOH of an aqueous solution with hydrogen ion concentration equal to `3xx10^(-5)" mol L"^(-1)`?
A. 9.47
B. 4.52
C. 12.69
D. 11.69
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Correct Answer - A
`pH=-log[H^(+)]=-log(3xx10^(-5))=4.5229pOH=14-pH,14-4.5229=9.47`
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