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Precipitation Titration: Determination of Chloride by the ...

Precipitation Titration: Determination of Chloride by the Mohr Methodby Dr. Deniz KorkmazIntroductionTitration is a process by which the concentration of an unknown substance in solution isdetermined by adding measured amounts of a standard solution that reacts with theunknown. Then the concentration of the unknown can be calculated using the stoichiometryof the reaction and the number of moles of standard solution needed to reach the socalled end titrations are based upon reactions that yield ionic compounds of limitedsolubility. The most important precipitating reagent is silver nitrate . Titrimetric methodsbased upon silver nitrate are sometimes termed argentometric methods. Potassiumchromate can serve as an end point indicator for the argentometric Determination ofchloride, bromide and cyanide ions by reacting with silver ions to form a brick-red silverchromate precipitate in the equivalence point Mohr method uses chromate ions as an indicator in the titration of Chloride ions with asilver nitrate standard solution.

Standard silver nitrate solution and the silver chloride precipitates formed were protected from light at all times because silver chloride decomposes according to: AgCl ÷ Ag(s) + ½ Cl 2 (g) The silver ion concentration at chemical equivalence in the titration of chloride with silver ions is given by: [Ag+-] = = = 1.35 x 105 M

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ncert.nic.in

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Silver, Silver nitrate, MANUAL OF METHODS OF ANALYSIS OF FOODS, Nitrate, 0.1 M