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Volume expansion and contraction during a battery cycle make it necessary to use correction terms when electrolyte analyses are made. For example, volume contrac tion during the charge cycle, due to zinc chloride removal, has the effect of in creasing the molar concentration of the supporting electrolyte. Experimental results for the partial molal volumes of zinc chloride, potassium chlo ride/and sodium chloride are included in this section. These results are compared to literature values for aqueous solutions and the magnitude of the electrolyte volume change is evaluated. PREPARATION OF STANDARD ZINC CHLORIDE SOLUTIONS Concentrated zinc chloride solutions are prepared at EDA from the reaction of zinc metal with an aqueous chlorine solution. The concentrate is generally about 5 molar in zinc ion. Standard zinc-chloride solutions approximating 1, 2, 3, and 4 molar were prepared by careful dilution of the zinc chloride concentrate. Distilled or deionized water was used for all the experimental work. The zinc concentration in each of the solutions was determined potentiometrically using ferrocyanide as the titrant and is based on the ferro-ferricyanide couple. Details of the titration procedure are found in Instrumental Methods of Analysis (30-1). End points were determined by double differentiation of the titration curves. The analyzed zinc concentrations in the prepared standard solutions are given in Table 30-1. Table 30-1 ZnCl2 SOLUTIONS AT 24 ± 2°C Solution 1 2 3 4 Zinc Cone, (mol/ft) 1.010 1.996 3.002 3.990 30-2PDF Image | Development of the Zinc-Chlorine Battery for Utility
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