# Do the proportions of solute to solvent vary in heterogeneous mixtures?

We could slurry up an insoluble species up in a solvent, say water. And clearly, we could add more solute to the slurry to make it thicker; or we could add more solvent to the slurry to make it thinner. By definition, the solid, and the solvent are present in two phases, i.e. $\text{heterogeneous}$.