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Question
Determine the osmotic pressure of a solution prepared by dissolving 2.5 × 10−2 g of K2SO4 in 2L of water at 25°C, assuming that it is completely dissociated.
(R = 0.0821 L atm K−1 mol−1, Molar mass of K2SO4 = 174 g mol−1)
Solution
When K2SO4 is dissolved in water , ions are produced.
Total number of ions produced = 3
i = 3
`pi = "iCRT" = ("i"xx"n"xx"R"xx"T")/"V"`
`=> pi = 3 xx (2.5 xx 10^-2 "g")/(174 "g mol"^-1) xx (0.0821 "L" "atm" "K"^-1 "mol"^-1)/"2L" xx 298 "K"`
`= 5.27 xx 10^-3 "atm"`
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