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pH

The pH of a 0...

Question

The pH of a 0.001 M aqueous solution of sodium hydroxide will be:

A

5

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B

7.5

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C

9

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D

11

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Solution

The correct option is D 11
NaOH is a strong electrolyte. It completely dissociates.
Thus $[O H^{-}] = [N a O H] = 0.001$ M.
$p O H = - l o g [O H^{+}] = - l o g 10^{- 3} = 3.0$ .
$p H = 14.0 - p O H = 14.0 - 3.0 = 11.0$ .

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