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  • Determine the osmotic pressure of a solution prepared by dissolving 25 mg of K_2 SO_4 in 2 litre of water at 25 degree C.assuming that it is completely dissociated.

2.41    Determine the osmotic pressure of a solution prepared by dissolving 25\; mg  of K_{2}SO_{4}  in  2\; litre  of water at 25^{\circ}C,  assuming that it is completely dissociated.

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Dissociation of K2SO4 is as follows :- 

                                  

It is clear that 3 ions are produced, so the value of i will be 3.

Molecular weight of K2SO4 = 2(39) + 1(32) + 4(16) = 174u.

                                                \Pi = i\ C\ R\ T

Putting all the values in the formula  :-

                                      \Pi =\frac{3 \times 25 \times 10-3 \times 0.082 \times 298}{174\times2}

                                            = 5.27\times10^{-3}\ atm

Posted by

Devendra Khairwa

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