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What is negative deviation?...

What is negative deviation?

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### Step-by-Step Solution: 1. **Definition of Negative Deviation**: Negative deviation from Raoult's law occurs when the vapor pressure of a solution is lower than what is predicted by Raoult's law. Raoult's law states that the vapor pressure of a solvent in a solution is directly proportional to the mole fraction of the solvent. **Hint**: Remember that Raoult's law applies to ideal solutions where interactions between molecules are similar. 2. **Understanding Interactions**: In a solution, there are different types of molecular interactions: solute-solute (AA), solvent-solvent (BB), and solute-solvent (AB). For negative deviation to occur, the solute-solvent interactions (AB) must be stronger than both solute-solute and solvent-solvent interactions. ...
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