Question

84. Calculate the ratio of pH of a solution containing
1 mole of CH3COONa + 1 mole of HCl per litre and
of other solution containing 1 mole CH3COONa + 1
mole of acetic acid per litre :-
(a) 1:1
(b) 2:1
el1:2
(d) 2:3
​

Answer 1

Explanation:

Correct option is

C

1:2

For CH

3

COONa+HCl→CH

3

COOH+NaCl

[CH

3

COOH]=1M

[H

+

]=

K

a

C

=

K

a

pH

1

=−

2

1

logK

a

Since it is a buffer,

CH

3

COONa+CH

3

COOH

PH

2

=−logK

a

+log

1

1

=−logK

a

pH

2

pH

1

=

2

1

Hence ratio is 1:2

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