Determining Chloride Ion Concentration using the Mohr Method
Reference:
Tracy F. (2021, August 17). Determining Chloride Ion Concentration using the Mohr Method.
The Mohr method is a technique for determining the amount of chloride ion in an unknown sample. It is based on the difference in solubility between the silver chloride (AgCl; Ksp = 1.6 x 10-10) and silver chromate (Ag2CrO4; Ksp = 6.2 x 10-12). In using this method, one adds a small amount of chromate ion to a solution with unknown chloride ion concentration. By measuring the volume of AgNO3 added before the appearance of the red silver chromate solid, one can determine the amount of chloride ion originally present. Suppose we have a solution that is 0.100 M Cl- and 0.0025 M CrO42-. If we add 0.100 M AgNO3 solution drop by drop, will AgCl or Ag2CrO4 precipitate first? Provide mathematical evidence to support your answer in part a. When Ag2CrO4(s) first appears, what fraction of Cl- originally present remains in the solution?
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Submitted by Tracy F. Aug. 17, 2021 06:15 a.m.
1 answer