Why does the boiling point of a mixture of volatile hydrocarbons increase over time during a dis

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Why does the boiling point of a mixture of volatile...

Key Concepts

Distillation

Distillation is a separation process where components of a liquid mixture are separated based on differences in their volatilities. In this process, the more volatile components vaporize at lower temperatures and are removed as vapor, while the less volatile components remain in the liquid, leading to a change in composition over time.

Vapor-Liquid Equilibrium

Vapor-liquid equilibrium refers to the state in which the rate of evaporation of a liquid equals the rate of condensation of its vapor. In mixtures, the vapor phase is enriched in the more volatile components, causing the composition and thus the physical properties, such as boiling point, of the remaining liquid to change as distillation progresses.

Relative Volatility

Relative volatility is a measure of the difference in vapor pressures between the components in a mixture. A higher relative volatility means that one component evaporates more readily than the other. As distillation proceeds, the component with the higher volatility is preferentially removed, altering the mixture’s composition and resulting in a gradual increase in the boiling point of the remaining liquid.

Changing Composition

Changing composition in a distillation process occurs because the more volatile component is removed first, leaving behind a residue that becomes progressively richer in the less volatile components. This compositional shift directly affects the boiling point of the mixture, causing it to increase as the distillation continues.

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