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(D) Two solutions are isotonic if they have the same osmotic pressure $(\pi)$.Since $\pi = iCRT$,for the same temperature $(T)$,the product of the van

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$0.1 \ M$ $Ba(NO_3)_2$ and $0.1 \ M$ $Na_2SO_4$

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(D) Two solutions are isotonic if they have the same osmotic pressure $(\pi)$.Since $\pi = iCRT$,for the same temperature $(T)$,the product of the van't Hoff factor $(i)$ and molarity $(C)$ must be equal for both solutions.For option $D$:$1.$ $0.1 \ M$ $Ba(NO_3)_2$: $i = 3$ $(Ba^{2+} + 2NO_3^-)$,so $iC = 3 	imes 0.1 = 0.3 \ M$.$2.$ $0.1 \ M$ $Na_2SO_4$: $i = 3$ $(2Na^+ + SO_4^{2-})$,so $iC = 3 	imes 0.1 = 0.3 \ M$.Since $iC$ values are equal,the solutions are isotonic.

Which of the following pairs of solutions can be isotonic at the same temperature?

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