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

Abstract

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.