Equilibrium Question 428

Question: A buffer solution has equal volumes of 0.2M,NH4OH and 0.02M,NH4Cl . The pKb of the base is 5. The pH is [CBSE PMT 1989; KCET 2005]

Options:

A) 10

B) 9

C) 4

D) 7

Show Answer

Answer:

Correct Answer: A

Solution:

pOH=pKb+log[salt][ base ]

=5+log0.020.2=5+log110=5+(1)=4

pH=14pOH=144=10



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