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?

Question

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.

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?

Want to Fund your own JEE / NEET / Foundation preparation ??

Detailed Solution

Get Expert Academic Guidance – Connect with a Counselor Today!