Question

When only a little quantity of hgcl2 is added to excess ki?

Answer 1

Answer:

When HgI2 is added to aqueous solution of KI, why is there an increase in osmotic pressure of solution? Equimolar solutions in the same solvent have the same boiling point and freezing point. ... Vant's hoff factor decrease , hence freezing point increases.

Answer 2

When only a little quantity of HgCl2 is added to an aqueous solution containing excess of KI, there is a formation of a brown coloured complex K2[HgI4] ,which is popularly known as Nessler's reagent.

• The colligative properties observed is lesser than the actual value of colligative properties , since the Van't Hoff factor for the given reaction is less than 1.
• THis fact can be observed as one mole of HgCl2 and two moles of KI combines to form one mole of yhe complex, so there is a reduction in the number of solute paricles,which makes the Van't Hoff factor less than 1.