A) 5
B) 10
C) $ {10^{-5}} $
D) $ {10^{-9}} $
Correct Answer: D
$ pH=5means[{H^{+}}]={10^{-5}} $
$ pOH=14-pH=14-5=9 $
$ [O{H^{-}}]={10^{-pOH}}={10^{-9}} $
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