Chemistry - Liquid Solution Question with Solution | TestHub

Question Explanation: Identifying the nature of curves in a boiling point-composition diagram. Concept: T-x Phase Diagram for Ideal Solutions.

Solution:

1. At constant P, $T=f(x)$. Since $P=x_A{P}_A^{\circ }(T)+x_B{P}_B^{\circ }(T)$ and $P^{\circ }$ varies exponentially with T (Clausius-Clapeyron), the relationship is non-linear.

2. On a T-x diagram, the region above is Vapor, and the region below is Liquid. The "Liquidus" (start of boiling) is below the "Vaporus" (start of condensation) in terms of temperature for a given composition.

Final Answer: Both are curved, with the liquidus curve lying below the vaporus curve