Equilibrium Question 420
Question: The $ pH $ of $ {10^{-5}} $ M aqueous solution of $ NaOH $ is [MP PET 1996]
Options:
A) 5
B) 7
C) 9
D) 11
Show Answer
Answer:
Correct Answer: C
Solution:
NaOH ⇌ $ N{a^{+}}+O{H^{-}} $
$ [O{H^{-}}]={10^{-5}} $ M ; $ [{H^{+}}][O{H^{-}}]={10^{-14}} $
$ [{H^{+}}]=\frac{{10^{-14}}}{{10^{-5}}} $ ; $ [{H^{+}}]={10^{-9}} $ M ; $ pH=9 $ .
