It is a solution, in which the solute molecules interact only with the solvent ones, due to the high dilution at which the solutes are found.
The chemical potential of the solvent in an ideal dilute solution is given by: \begin{equation} \mu_A=\mu_{A}^{\ast}+RTlnx_A \end{equation} The chemical potential of the solute in an ideal dilute solution , is: \begin{equation} \mu_{i}=\mu_{i}^{0}+RTlnx_i \end{equation}