Equilibrium Question 315
Question: pH of a solution produced when an aqueous solution of $ pH $ 6 is mixed with an equal volume of an aqueous solution of $ pH $ 3 is about [KCET 2001]
Options:
A) 3.3
B) 4.3
C) 4.0
D) 4.5
Show Answer
Answer:
Correct Answer: A
Solution:
$ pH=6 $ means $ [{H^{+}}]={10^{-6}}M $
$ pH=3 $ means $ [{H^{=}}]={10^{-3}}M $ After mixing, Total $ [{H^{+}}]=\frac{({10^{-6}}+{10^{-3}})}{2} $
$ =\frac{1.001\times {10^{-3}}}{2} $
$ =5.005\times {10^{-4}} $
$ pH=4-\log 5.005 $ ; $ pH=3.301 $ .
