A solute A dimerizes in water. The boiling point of a 2 molal solution of A is 100.52°C. The percentage association of A is (Round off to the Nearest integer)

Use: for water = 0.52 K kg mol⁻¹. Boil

Question

A solute A dimerizes in water. The boiling point of a 2 molal solution of A is 100.52°C. The percentage association of A is  (Round off to the Nearest integer)

Use:  for water = 0.52 K kg mol⁻¹. Boiling point of water = 100°C

Canvas Classes · Accepted Answer

Strategy:
 Calculate the van't Hoff factor () from the boiling point elevation. For a dimerizing substance,  relates to the degree of association  via the formula . Use this to find the percentage association.

Step 1: Calculate 
.

Step 2: Calculate van't Hoff factor ()
, .

Step 3: Calculate degree of association ()
For dimerization: .

Percentage association = .

More questions from Solutions