Equilibrium Question 477
Question: A base is dissolved in water yields a solution with a hydroxide ion concentration of 0.05 $ mollitr{e^{-1}}. $ The solution is [AFMC 1997]
Options:
A) Basic
B) Acid
C) Neutral
D) Both A and B
Show Answer
Answer:
Correct Answer: A
Solution:
$ [O{H^{-}}] $ ion conc. $ =0.05\frac{mol}{l} $
$ =5\times {10^{-2}}\frac{mol}{l} $
$ pOH=-\log [O{H^{-}}] $
$ =-\log [5\times {10^{-2}}] $
$ pOH=1.30 $ ; $ pH+pOH=14 $
$ pH=14-pOH $
$ =14-1.30=12.7 $
