Increasing amount of solid $$HgI2$$ is added to $$1$$ L of an aqueous solution containing $$0.1$$ mol KI. Which of the following graphs do represent the variation of freezing point of the resulting solution with the amount of $$HgI2$$ added?

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Infinity Learn · Accepted Answer

When $$HgI2$$ is added to KI:$$HgI2$$       $$+$$        $$2KI$$    →    $$K2HgI4$$ $$-$$                      $$0.05$$               $$0.1$$ $$-$$                       $$-$$                   $$0.05$$⇒$$0.05$$ moles of $$HgI2$$ are required for its complex reaction with KI.Thus, as $$HgI2$$ is being added, the number of solute molecules will decrease causing ∆Tf to decrease ⇒ (Causing$$ Tf to $$increase). When whole of KI has been converted to $$K2HgI4$$ further addition of $$HgI2$$ does not change Tf since it is a sparingly soluble salt.

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