1.

Which of the following solution will have pH of 4.74

Answer»

100 mL of 1 M `CH_(3)COOH (pK_(a)=4.74)` at the equivalence point using 1 M NaOH
50 Ml OF 1 M `CH_(3)COONa+25` mL of 1 M HCl
50mL of 1 M `CH_(3) COOH +` 25 mL of 1 M NaOH
Both (B) and (C )

Solution :In acid base titration, at equivalence point pH `=pK_("in")`
50 mL of 1M `CH_(3)COONa + 25 mL ` of 1M HCl
`=25` mL of 1 M `CH_(30COOH +25` mL of 1 M NaCl
This is because strong acid HCl will displace weak acid, `CH_(3)COOH`
In case of an acid solution when
[salt]=[acid]
`pH =pK_(a)=4.74`
`:. ` Choice `(B)` is CORRECT .
At mid point of a titration of a weak acid and strong base
`pH=pK_(a) =4.74`
`:. ` Choice `(C )` is also correct


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