Page 129 - Pharmaceutical_Analytical_Chemistry_1_Theoretical_Notes_Level_1

Mansoura National University
Pharm D-Clinical Pharmacy Program Level 1 Pharm. Anal. Chem. 1 (PC 101)

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Before starting During titration Just after
titration End Point
(AgCl is formed) the end point

-
Cl sample CrO 2- ind.
- 4 CrO 2- ind.
Cl sample 2- 4

+ CrO 4 ind. + AgCl ppt

+ CrO 2- ind. + AgCl ppt
4 + AgCl ppt + few
+ Excess
  Ag CrO ppt
2 4 Ag CrO ppt
Clear Bright Yellow Turbid Bright Yellow 2 4
Soln. Soln. 

Turbid Dark

Yellow Soln.

Note: Actual colors in the lab may vary somewhat from what is shown. These pictures are
intended as a rough guide only.

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