Q.

Find out the osmotic pressure of 0.1 M monobasic acid, if pH = 2.0 at 25oC.

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2.69 atm

26.9 atm

0.269 atm

None of these

answer is A.

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Detailed Solution

HAH++A−C00C(1−α)CαCαH+=CαH+=10−2 [∵pH=2]Cα=10−2α=10−20.1=0.1Total number of moles after dissociation=C−Cα+Cα+Cα=C(1+α)van't Hoff factor =C(1+α)C=1+α=1+0.1=1.1π=iCRT=1.1×0.1×0.0821×298 =2.69atm

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