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ACIDITY OF STOICHIOMETRIC ZINC CHLORIDE SOLUTIONS The zinc chloride produced at EDA usually contains a small amount of zinc hydroxide Experimentally, it has been determined that the zinc hydroxide may be titrated to a stoichiometric end-point as shown in Figure 30-1. The pH at the end point, which corresponds to a stoichiometric zinc chloride solution, is dependent on the zinc chloride concentration. The pH of zinc chloride solutions as determined using this technique is shown graphically in Figure 30-2. a 3.5 END POINT VOLUME — 1.26ML END POINT pH —3.45 VOLUME HCI— ml Figure 30-1. Titration curve of 1.0 molar ZnCl2 solution containing a trace of Zn(0H)2 with dilute HCI. MEASURED ACIDITIES OF ELECTROLYTE-HYDROCHLORIC ACID SOLUTIONS The measured pH of zinc chloride solutions containing hydrochloric acid is a func tion of both the zinc chloride concentration and the free acid concentration. Zinc chloride behaves as a weak acid due to hydrolysis and the addition of a strong acid to concentrated zinc chloride solutions is somewhat analogous to the addition of a strong acid to a weak acid, such as acetic acid. Therefore, as the zinc chloride 30-3PDF Image | Development of the Zinc-Chlorine Battery for Utility
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