question_answer 53)

Determine the osmotic pressure of a solution prepared by dissolving 25 mg of K2SO4 in 2 litre of water at 25° C, assuming that it is completely dissociated.

Answer:

Applying vant's Hoff equation, = iCRT =     = 0.0308mol Molar mass of CaCl2 = 40 + 2 x 35.5 = 111 g mol?1 Amount of CaCl2 dissolved = 0.0308 x 111g = 3.42 g