Q1: When acetone is added in a two layer mixture of methyl isobutyl ketone and water at 30°C, the acetone distributes between the two layers and the composition of the layer follows two solubility curves. For this system,

ANS:D - all (a), (b) and (c).

For this system: all (a), (b), and (c) are correct. Let's break down each statement: a. As the acetone concentration increases, the solubility curves approach each other: This is typically observed in systems where a component (acetone, in this case) is distributed between two immiscible phases (methyl isobutyl ketone and water). As the concentration of acetone increases, its distribution between the two phases becomes more balanced, leading to a convergence of the solubility curves. b. Both the phases become identical at a particular common point on both the solubility curves called the plait point: The plait point is the point at which the compositions of both phases become identical. At this point, the distribution of acetone between the two phases reaches equilibrium, resulting in identical compositions in both phases. c. The distribution curve, which is a plot between x (acetone concentration in one phase) and y (acetone concentration in the other phase), is analogous to the x-y curve used in distillation and absorption and terminates on the x = y diagonal at the concentration of the plait point: This statement describes the distribution curve, which represents the equilibrium distribution of acetone between the two phases. At the plait point, where the compositions of both phases become identical, the distribution curve terminates on the x = y diagonal. Therefore, all of the statements (a), (b), and (c) are true for this system.