Question

Van't Hoff Factor of a mixture of 2 moles of KI with 1 mole of HgI, in a solution of water is...........  (INTEGER TYPE QUESTION)

Answer 1

Two moles of KI react with on mole of HgI₂ to form one mole of the complex K₂[HgI₄].

2KI + HgI₂ ⇌ K₂[HgI₄]

In aqueous solution, one mole of the complex K₂[HgI₄] dissociates to give 3 moles of ions.

K₂HgI₄ ⇌ 2K⁺ +[HgI₄]²⁻

Van't Hoff factor i = \(\mathrm{\frac{n(observed)}{n(theoretical)}} = \frac 3 1 = 3\)

Thus, Van't Hoff factor of a mixture of two moles of KI with 1 mole HgI₂ in a solution of water is 3.