Solvation is the process of reorganizing solvent and solute molecules into solvation complexes. The solubility of a given solute in a given solvent is function of temperature. Solid chloroauric acid is a hydrophilic (ionic) protic solute. Solvation of a solute by water is called hydration. When something is dissolved, molecules of the solvent arrange around molecules of the solute. This also depends on the membrane permeability coefficient "K" for the solute in question. To dilute a solution means to add more solvent without the addition of more solute. Hydridocopper is a hydrophilic (polar) solute, and so dissolves in polar compounds. They are essentially solvent properties which are changed by the presence of the solute. Volume percent is the concentration of a certain solute, measured by volume, in a solution. This phenomenon illustrates how different solvents interact differently with the same solute. It is necessary for the nuclei to be identical to the solute that is crystallizing. Transport may involve one or more of each type of solute. It is measured in osmoles of the solute per kilogram of water. The most common method of measuring the distribution of the solute is by UV/VIS spectroscopy.