Depression in freezing point of NaCI is twice that of in urea. Why?

1.	Depression in freezing point of NaCI is twice that of in urea. Why?
Answer» 1. The electrolyte NaCI dissociates completely into its constituent ions in their aqueous solution. This causes an increase in the total number olparticles present in the solution. 2. When we dissolve 1 mole of NaCI in water it. dissociates and gives 1 mole of Na⁺ and 1 mole of Cl^- . Hence the solution will have 2 moles of particles. But when we dissolve 1 mole of urea (non electrolyte) in water it appears as 1 mole only. So the colligative property value would be double in NaCl than in urea.

Answer»

1. The electrolyte NaCI dissociates completely into its constituent ions in their aqueous solution. This causes an increase in the total number olparticles present in the solution.

2. When we dissolve 1 mole of NaCI in water it. dissociates and gives 1 mole of Na⁺ and 1 mole of Cl^- . Hence the solution will have 2 moles of particles.

But when we dissolve 1 mole of urea (non electrolyte) in water it appears as 1 mole only. So the colligative property value would be double in NaCl than in urea.

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