1.

Determine the osmotic pressure of a solution prepared by dissolving "25 mg of "K_(2)SO_(4) in 2 litre of water at 25^(@)C, assuming that it is completely dissociated.

Answer»

Solution :`K_(2)SO_(4)" dissolved = 25 mg = 0.025 g"`
`"Molar MASS of "K_(2)SO_(4)=2xx39+32+4xx16="174 g mol"^(-1)`
As `K_(2)SO_(4)` dissociates completely as `K_(2)SO_(4)rarr 2K^(+)+SO_(4)^(2-)`, i.e., ions produced = 3, `therefore i=3`
`thereforepi=iCRT=i(n)/(V)RT=ixx(w)/(M)xx(1)/(V)RT=3xx("0.025 g")/("174 g mol"^(-1))xx(1)/(2K)xx"0.0821 L atm K"^(-1)"mol"^(-1)xx"298 K"`
`=5.27xx10^(-3)" atm."`


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