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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)

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detailed solution

Correct option is D

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+log⁡CH3COONaCH3COOH=pKa

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Arrange the following solutions in the decreasing order of pOH

A) 0.01 M HCl      B) 0.01 M NaOH  C) 0.01 M CH3COONa  D) 0.01 M NaCl


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