1.

Determine the osmotic pressure of a solution prepared by dissolving 25 mg of K_2 SO_4 in 2 litre of water 25^(@)C assuming that it is completely dissociated .

Answer»

Solution :If `K_(2) SO_(4)` is completely dissociated , `K_(2) SO_(4) to 2 K^(+) + SO_(4)^(2-)`
` t = 3`
Mol mass of `K_(2) SO_(4) = 2 xx 39 + 32 + 4 xx 16 = 174 g mol^(-1)`
`pi = iCRT`
`= i(W_(B) xx RT)/(M_(B) xx V)`
`= (3 xx 25 xx 10^(-3) xx 0.082 xx 298)/(174 xx 2.0)`
`= 5.27 xx 10^(-3)` atm


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