Dilute solutions of about 50 typical salts, acids, and bases in the concentration range 10 -8 to 10-~M were frozen at nonequilibrium rates. The freezing potential, charge separation across the phase boundary, and chemical composition of the phases were measured. The charge separation is a function of ionic species present in the solution, their concentration, and the freezing rate. It is caused by a differential transfer of ion constituents across the phase boundary. Hydrogen and hydroxyl ions neutralize the charge as the phase boundary advances. The solution pH greatly affects the charge separation, other conditions held constant.x Present address: California State Polytechnic College, San Luis Obispo, California.Key words: interracial electrical effects, ice/water system, freezing potentials, differential solute incorporation in ice, ice/water interface potentials, charge separation at the advancing ice/water interface.) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 134.129.182.74 Downloaded on 2014-11-19 to IP Vol. 116, No. 6 INTERFACIAL ELECTRICAL EFFECTS 797 ~Plotinum wire electrode ~ -Thin-wolled Teflon cylinder Platinum bose ~'onnection for ground wire 5 inch cylindrical copper b~ock Idi~ /7"/7"/7-/72 protruding from deep freeze J oopoer ~~ oopper fins fins ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 134.129.182.74 Downloaded on 2014-11-19 to IP

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Search of the literature reveals that data on the thermodynamic properties of hydrazine and its salts are few and scattered. As the basis of an extensive investigation of these properties the heat capacities of solutions of certain hydrazonium salts have now been determined.