1.

Calculate the osmotic pressure of a 0.1 M monobasic and if its pH is 2.0 at 25^(@)C.

Answer»

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Solution :`{:(,HA,hArr,H^(+),+,A^(-)),("INITIAL","C mol L"^(-1),,,,),("At. eqm.",""C-Calpha,,""Calpha,,"Calpha):}`
`""(alpha = " degree of dissociation")`
`"i.e."[H^(+)]=C alpha. " But "[H^(+)] = 10^(-2)M`
`therefore""Calpha =10^(-2) or alpha =(10^(-2))/(C)=(10^(-2))/(0.1)=0.1`
Total number of particles after dissociation `=C-C alpha + C alpha+ C alpha=C(1+alpha)`
`therefore"van't Hoff factor (i)"=(C(1+alpha))/(C)=1+alpha=1+0.1=1.1`
`therefore"Osmotic PRESSURE (P) = i CRT = "1.1xx0.1xx0.0821 xx 298 atm = 2.69 atm.`


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