Question

Assuming salts to be 90% dissociated, which of the following will have highest osmotic pressure?
(1) Decinormal Al2(SO4)3
(2) Decinormal BaCl2
(3) Decinormal Na2SO4
(4) A solution obtained by mixing equal volumes of (2) & (3) and filtering

Answer 1

Answer:

Al2(SO4)3

Explanation:

Vant hoff factor i = 2+3 =5 for Al2(SO4)3

3 for BaCl2 3 for Na2SO4

so it is maximum for Al2(SO4)

-> O.P = i C R T

highest O.P is for Al2(SO4)3