Equilibrium Question 808
Question: Which of the following statements about pH and $ {H^{+}} $ ion concentration is incorrec'
Options:
A) Addition of one drop of concentrated $ HCl $ in $ NH_4OH $ solution decreases pH of the solution.
B) A solution of the mixture of one equivalent of each of $ CH_3COOH $ and $ NaOH $ has a pH of 7
C) pH of pure neutral water is not zero
D) A cold and concentrated $ H_2SO_4 $ has lower $ {H^{+}} $ ion concentration than a dilute solution of $ H_2SO_4 $
Show Answer
Answer:
Correct Answer: B
Solution:
$ CH_3COOH $ is weak acid while $ NaOH $ is strong base, so one equivalent of $ NaOH $ can not be neutralized with one equivalent of $ CH_3COOH $ . Hence the solution of one equivalent of each does not have pH value as 7. Its pH will be towards basic side as $ NaOH $ is a strong base hence cone. of $ O{H^{-}} $ will be more than the cone. of $ {H^{+}} $ .
