If pKa = 4 at a particular temperature then van't Hoff factor, i for 0.01 M monobasic acid is,

Question

If pKa = 4 at a particular temperature then van't Hoff factor, i for 0.01 M monobasic acid is, (A) 1.01 (B) 1.02 (C) 1.10 (D) 1.20

Tardigrade Admin · Accepted Answer

p Ka=4 - log 10 Ka=4 Ka=10-4 H A xrightleftharpoons text water H++A- Initial 0.01 M At eqm. (0.01 - x) M xM xM As the solution is quite dilute Ka = (x2/0.01) = 104 x2 = 10-2 x = 10-1 = 0.1 i = (1-x + x+ x/1) = (1 + x/1) = (1 + 0.1 /1) = 1.1

Q. If pKa​=4 at a particular temperature then van't Hoff factor, i for 0.01 M monobasic acid is,

1.01

1.02

1.10

1.20

p​Ka​=4 −log10​Ka​=4 Ka​=10−4 HA water ​H++A− Initial 0.01M At eqm. (0.01−x)MxMxM As the solution is quite dilute Ka​=0.01x2​=104 x2=10−2 x=10−1=0.1 i=11−x+x+x​ =11+x​=11+0.1​=1.1

Q. If $p K_{a} = 4$ at a particular temperature then van't Hoff factor, i for 0.01 M monobasic acid is,