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In which of the following mixed aqueous ...

In which of the following mixed aqueous solutions pH = pKa at equilibrium
(1) 100 mL of `0.1 " M " CH_(3)COOH +100 " mL of 0.1 M " CH_(3)COONa`
(2) 100 mL of `0.1 " M " CH_(3)COOH + 50 `mL of 0.1 M NaOH
(3) 100 mL of 0.1 M `CH_(3)COOH ` + 100 mL of 0.1 M NaOH
(4) 100 mL of `0.1 " M " CH_(3)COOH +100` mL of 0.1 M `NH_(3)`

A

(1) is correct

B

(2) is correct

C

(3) is correct

D

Both (1) and (2) are correct

Text Solution

Verified by Experts

The correct Answer is:
D
(1) [Salt]= [Acid] `rArr pH = pK_(a)`
(2) `{:(CH_(3)COOH,+,NaOH,hArr,CH_(3)COONa,+,H_(2)O,),((100xx0.1),,(50xx0.1),,0,,0,"Intial"),((10-5),,0,,5,,5,"Final"):}`
So `[CH_(3)COONa] = [CH_(3)COOH] = 5//150`
Hence `pH = pK_(a)`
(3) Acid and base will completely neutralize and form a basic salt only .So `pH gt 7`
(4) Weak acid and weak base will completely neutralize and form a neutral salt. So pH `approx ` 7 .
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