Estimation of Ferrous Iron / Fe(II)

 

Ø  Apparatus:-

·         250 ml conical flask

·         100 ml cylinder

·         50 ml burette

·         10 ml pipette

Ø  Reagents:-

·         0.1 (N) Potassium Dichromate Solution

·         Barium Diphenylamine Sulfonate (BDS) Indicator 

·         Sulphuric Acid (A.R. Grade)

·         Phosphoric Acid (A.R. Grade)

Ø  Preparation of Solution:-

·         0.1 (N) Potassium Dichromate Solution:- 

Weight accurately 4.903 g Potassium Dichromate and dissolve in 1L DM water.

·         Barium Diphenylamine Sulfonate (BDS) Indicator:-

Mix thoroughly 1 g Barium Diphenylamine Sulfonate (BDS) Indicator and 50 ml Sulphuric Acid (A.R Grade) and make upto 100 ml with DM Water.

Ø  Procedure:-

Take 10 ml of the solution in a 250 ml conical flask. Then add 10 ml Sulphuric Acid (A.R. Grade) and 5 ml Phosphoric Acid (A.R. Grade) and 50 ml DM Water. Then titrate with 0.1 (N) Potassium Dichromate Solution using 5 -7 drops BDS Indicator Solution until the colour changes from green to violet.

Ø  Calculation:-