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Nernst Equation

The pH of ...

Question

The $p H$ of $0.0001 M$ $N a O H$ is:

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Solution

The correct option is B 10
$N a O H$ is a strong electrolyte. It completely dissociates in the solution.
$[N a O H] = [O H]^{-} = 0.0001$ M.
$p O H = - l o g [O H]^{-} = - l o g 0.0001 = 4$ .
But $p H + p O H = 14$ .
Hence, $p H = 14 - p O H = 14 - 4 = 10$ .

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