2 molal solution of a weak acid HA has a freezing point of . The degree of dissociation of this acid is . (Round off to the Nearest Integer).

[Given: Molal depression constant of water = 1.85 K kg mo

Question

2 molal solution of a weak acid HA has a freezing point of . The degree of dissociation of this acid is . (Round off to the Nearest Integer).

[Given: Molal depression constant of water = 1.85 K kg mol⁻¹, Freezing point of pure water = 0°C]

Canvas Classes · Accepted Answer

Strategy:
 Use the observed freezing point to find the actual depression (). Calculate the van't Hoff factor (), and then use the formula  for an acid  to find the degree of dissociation .

Step 1: Determine 
.

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

Step 3: Calculate degree of dissociation ()
For , .

In terms of : .

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