Equilibrium Question 370
Question: The $ pH $ of water at $ 25^{o}C $ is nearly [CPMT 1986, 89, 90, 93; CBSE PMT 1989; MADT Bihar 1995]
Options:
A) 2
B) 7
C) 10
D) 12
Show Answer
Answer:
Correct Answer: B
Solution:
$ [{H^{+}}]=[O{H^{-}}] $
$ K_{w}=[{H^{+}}][O{H^{-}}] $
$ ={10^{-14}} $
$ \therefore ,[{H^{+}}]={10^{-7}} $ , $ pH=-\log ,[{H^{+}}]=7 $ .
