Densities of binary mixtures of ZnBr2 + KBr, CdI2 + NaI and CdI2 + CsI, have been measured by an Archimedian method over a wide range of temperature. Results have been expressed in terms of simple linear equations in temperature. Molar volumes for the systems have excess values in the ZnBr2 + KBr and CdI2 + CsI systems but not to such an extent in the CdI2+NaI system. The excess molar volumes are related to the possible formation of complex ions in the systems concerned.
