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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 [OH]=[NaOH]=0.001 M.
pOH=log[OH+]=log103=3.0.
pH=14.0pOH=14.03.0=11.0.

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