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Precipitation Titration: Determination of Chloride by the ...

Precipitation Titration: Determination of Chloride by the Mohr Method by Dr. Deniz Korkmaz Introduction Titration is a process by which the concentration of an unknown substance in solution is determined by adding measured amounts of a standard solution that reacts with the unknown. Then the concentration of the unknown can be calculated using the stoichiometry of the reaction and the number of moles of standard solution needed to reach the so called end point. Precipitation titrations are based upon reactions that yield ionic compounds of limited solubility. The most important precipitating reagent is silver nitrate. Titrimetric methods based upon silver nitrate are sometimes termed argentometric methods. Potassium chromate can serve as an end point indicator for the argentometric Determination of Chloride , bromide and cyanide ions by reacting with silver ions to form a brick-red silver chromate precipitate in the equivalence point region.

Reagent-grade NaCl was dried overnight and cooled to room temperature. 0.2500 g portions of NaCl were weighed into Erlenmeyer flasks and dissolved in about 100 mL of distilled water. In order to adjust the pH of the solutions, small quantities of NaHCO 3 were added until effervescence ceased. About 2 mL of K 24 CrO was added and the

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