Question

$20 \,mL$ of $01 \,M \,NH _4 OH$ is mixed with $40\, mL$ of $005\, M \,HCl$ The $pH$ of the mixture is nearest to: (Given: $K _{ b }\left( NH _4 OH \right)=1 \times 10^{-5}, \log 2=030$, $\log 3=048, \log 5=069, \log 7=084$, $\log 11=104$ )

• A. $3.2$
• B. $4.2$
• C. $5.2$
• D. $6.2$

Answer 1

Answer: (C)

$5.2$

Answer 2

The correct option is (C).