Chemistry · The vapour pressure of solutions and Raoult's Law - Ideal and non-ideal solutions, vapour pressure composition, plots for ideal and non-ideal solutions
Which of the following will show a negative deviation from Raoult's law?
Which of the following will show a negative deviation from Raoult's law?
- A. Acetone-benzene
- B. Acetone-ethanol
- C. Benzene-methanol
- D. Acetone-chloroform
Step-by-step solution
Negative deviation from Raoult's law occurs when solute-solvent interactions are stronger than solute-solute and solvent-solvent interactions. In acetone-chloroform, hydrogen bonding between the carbonyl group of acetone and the hydrogen of chloroform strengthens intermolecular forces, reducing vapor pressure below the ideal value. Other pairs (acetone-benzene, acetone-ethanol, benzene-methanol) typically exhibit positive deviations due to weaker interactions.
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