Question

1. What are the characteristics of a non-ideal solution? 

2. Explain +ve and -ve deviations from Raoult’s law with suitable examples.

Answer 1

1. The characteristics of a non-ideal solution

Does not obey Raoult’s law over the entire range or concentration. Fora non-ideal solution having two volatile components A and B,

P_A ≠ P°_A χ_A

P_B ≠ P°_B χ_B

• Volume of mixing not equal to zero, D_mix V¹0
• Enthalpy of mixing not equal to zero, D_mix H¹0

 2.