The Conductance of Potassium Chloride and of Hydrochloric-Deuterochloric Acid H2O—D2O Mixtures. The Viscosity of H2O—D2O

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The conductances of 0.01 normal solutions of potassium chloride and of hydrochloric-deuterochloric acid in H2O—D2O mixtures, and the viscosities of H2O—D2O mixtures, have been investigated as a function of D2O concentration at 25°C. The viscosity of D2O is 23 percent greater, the conductance of potassium chloride in D2O is 17 percent less, and the conductance of deuterochloric acid in D2O is 26 percent less, than the corresponding values in H2O. The viscosity, and the conductance of potassium chloride solutions and of hydrochloric-deuterochloric acid solutions show a maximum deviation of 0.4, 0.8 and 5.4 percent of the total values, respectively, from linearity. The decreased conductance of potassium chloride solutions in D2O is due mainly to the increased viscosity of the solvent. The marked deviation from linearity of the hydrochloric-deuterochloric acid curve is interpreted on the basis of a statistical correction to the proton exchange mechanism for the mobilities of H3O+ and D3O+ in H2O—D2O mixtures.