Potassium chromate is used as an indicator in titrations for the determination of chloride ion. At the end-point of a titration of an aqueous solution of a metal chloride salt (e.g. NaCI) against silver nitrate solution in the presence of potassium chromate, red Ag2CrO4 precipitates. Give equations for the pertinent reactions occurring during the titration, and, using relevant data from Table 7.4, explain how the indicator works.
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