A 2 molal solution of sodium chloride in water causes an elevation in

1.	A 2 molal solution of sodium chloride in water causes an elevation in the boiling point of water by 1.88 K. What is the value of Vant Hoff factor? What does it signify? [Kb = 0.52 K kg mol-1]
Answer» ΔT_b = i x K_b x molality, where i is Van't Hoff factor Given, ΔT_b = 1.88 K K_b = 0.52 K kg mol^-1 Molality = 2 i = \(\frac{1.88}{0.52\times2}\) i = 1.8076 This value of ‘i’ signifies that when 1 mole of NaCl is dissolved in water it dissociates to give 1.8076 moles of particles in the solution.

A 2 molal solution of sodium chloride in water causes an elevation in the boiling point of water by 1.88 K. What is the value of Vant Hoff factor? What does it signify? [Kb = 0.52 K kg mol-1]

Answer»

ΔT_b = i x K_b x molality, where i is Van't Hoff factor

Given, ΔT_b = 1.88 K

K_b = 0.52 K kg mol^-1

Molality = 2

i = \(\frac{1.88}{0.52\times2}\)

i = 1.8076

This value of ‘i’ signifies that when 1 mole of NaCl is dissolved in water it dissociates to give 1.8076 moles of particles in the solution.