Note 275 — Chapter VII · PHYSICAL OR HETEROGENEOUS EQUILIBRIUM.—THE COLLOIDAL CONDITION
Reading edition
Precipitation is complete only when the colloids are used in the proportions required to neutralize each other's charges [Billitzer, Z. phys. Chem., 51, 140 (1905)]. The proportions to be used must be determined in each case, most simply by trial (Noyes, loc. cit., p. 101), but quantitative methods for determining the charges, by titration, are also known (cf. Billitzer, loc. cit.).