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Question
The pH of 10−5 M KOH solution will be ____________.
Options
9
5
19
none of these
Solution
The pH of 10−5 M KOH solution will be 9.
Explanation:
\[\ce{\underset{10^{-5} m}{KOH} -> \underset{10^{-5} m}{K^+} + \underset{10^{-5} m}{OH^-}}\]
[OH–] = 10−5 M
pH = 14 – pOH
pH = 14 – (– log [OH–])
= 14 + log [OH–]
= 14 + log 10−5
= 14 – 5
= 9
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