Question

# The pH of a buffer solution prepared by mixing $$50 \: ml$$ of $$0.2M$$ $$CH_{3}COOH$$ and $$25\: ml$$ of $$CH_{3}COONa$$ is $$4.8$$. What is the concentration of $$CH_{3}COONa$$? $$[p{Ka}$$ of $$CH_{3}COOH= 4.8]$$

A
0.2M
B
0.4M
C
0.5M
D
0.8M

Solution

## The correct option is A 0.4M$$pH=pK_a+log\left( \dfrac {V \times [CH_3COONa]} {V \times [CH_3COOH]}\right)$$Substituting values in the above expression, we get,$$4.8=4.8+log\left( \dfrac {25 \times [CH_3COONa]} {50 \times 0.2}\right)$$$$[CH_3COONa]=0.4M$$Option B is correct.Chemistry

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