Which of the following solutions will have pH of 4.74?
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a
100mL of 1MCH3COOHpKa=4,74 at rhe equivalence point using NaOH
b
50mL of 1MCH3COONa+25mL of 1MHCl
c
50mL of 1M of CH3COOH+25mL of 1MNaOH
d
Both (b) and (c)
answer is D.
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Detailed Solution
Due to hydrolysis of CH3COONa (formed at equivalence point), solution is alkaline pH > 7, hence (a) is not true. In (b) and (c), [CH3COOH] = [CH3COONa]pH=pKa+logCH3COONaCH3COOH=pKa