Question

Which one of the following solutions will have highest osmotic pressure?

(Assume that all the salts are equally dissociated)

• A. $0.1M$ ${Al}_2{\left({SO}_4\right)}_3$
• B. $0.1M$ $Ba{Cl}_2$
• C. $0.1M$ ${Na}_2{SO}_4$
• D. The solution obtained by mixing equal volumes of $\left(A\right)$ and $\left(B\right)$

Answer 1

The correct option is A $0.1M$ ${Al}_2{\left({SO}_4\right)}_3$

Osmotic pressure is a colligative property and depends on the Van't hoff factor,i.I has the highest value for $A{l}_2{\left(S{O}_4\right)}_3$ as it dissociates to give 5 ions and therefore the osmotic pressure would be highest for solution containing decinormal $A{l}_2{\left(S{O}_4\right)}_3$.