pH of a 0.1 M weak monobasic acid is measured to be 2. Its osmotic pressure at a given temperature

Options

A. 0.1RT
B. 0.11RT
C. 1.1RT
D. 0.01RT

Answer

B

Explanation

`HA hArr H^(+) + A^(-)`
`{:(t=0,C,0,0),(t_(eq),C-C alpha,C alpha,C alpha):}`
`[H^(+)] = C alpha, [H^(+)] = 10^(-pH)`
`therefore C alpha= 10^(-2) rArr 0.1 alpha = 10^(-2) rArr alpha= 0.1`
`alpha= (i-1)/(n-1), 0.1 = (i-l)/(2-1) rArr i= 1.1`
`therefore pi= iCRT = 1.1 xx 0.1xx RT= 0.11RTJ`