Question

Calculate the ratio of pH of a solution containing
1 mole of CH COONa + 1 mole of HCl per litre
and of other solution containing 1 mole
CH3COONa + Imole of acetic acid per litre :-
(1) 1 : 1
(2) 2 : 1
(3) 1 : 2
(4) 2 : 3​

Answer 1

Explanation:

Correct option is

C

1:2

For CH3COONa+HCl→CH3COOH+NaCl

[CH3COOH]=1M

[H+]=KaC=KapH1=−21logKa

Since it is a buffer,

CH3COONa+CH3COOH

PH2=−logKa+log11=−logKa

pH2pH1=21  Hence ratio is 1:2