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Give reason...When mercuric iodide is added to aq.soln of KI ...the freezing point is raised

Give reason...When mercuric iodide is added to aq.soln of KI ...the freezing point is raised

Grade:12

1 Answers

Arun
25750 Points
6 years ago
Mercuric Iodide will react with Potassium Iodide to form dipotassium tetraiodomercury. The reaction is given below : 2KI + HgI2 = K2[HgI4] This association will decrease the number of ions in the solution as a result of which Van`t Hoff Factor (i) will decrease as ndecreases from 4 to 3. Now, Freezing point depression when a solute is added to a solvent is given by ΔT = i Kf m Clearly now i has decreased from when it was an aqueous KI solution to when HgI is added so ΔT is less now, hence less depression in freezing point which means a higher freezing point. Hence the freezing point of solution will increase. Note: Van`t Hoff factor (i) =1+alpha(n-1) where alpha=dissociation degree and n is the no of ions dissociated Hope you understand the reasoning behind it now.

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