Ideal solution

Definition

An ideal solution is a homogeneous mixture in which the enthalpy of mixing is zero, and the components obey Raoult's Law across all concentrations. These solutions exhibit no change in volume or heat when mixed.

5 Must Know Facts For Your Next Test

1. In an ideal solution, the interactions between different molecules are similar to those between like molecules.
2. Raoult's Law states that the partial vapor pressure of each component in an ideal solution is proportional to its mole fraction.
3. Ideal solutions do not show deviations from Raoult's Law at any concentration.
4. Common examples of nearly ideal solutions include mixtures of benzene and toluene, or hexane and heptane.
5. The concept of an ideal solution is often used as a reference point to understand real solution behavior.

Review Questions

Related terms

Raoult's Law:

A law stating that the partial vapor pressure of each component in a mixture is proportional to its mole fraction.

Enthalpy:

$H$ represents the total heat content of a system, defined as $H = U + PV$, where $U$ is internal energy, $P$ is pressure, and $V$ is volume.

Mole Fraction:

$\text{x}_i = \frac{n_i}{n_{\text{total}}}$ represents the ratio of moles of a component ($n_i$) to the total moles in the mixture ($n_{\text{total}}$).