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:-





Location: India

Comments

Post a Comment

Popular posts from this blog

Method for Preparation and Standardization of 0.1 (N) Iodine Solution

Image
  Ø   Apparatus:- ·          250 ml Iodine flask ·          100 ml Cylinder ·          50 ml Burette ·          1000 ml Volumetric Flask ·          250 ml Beaker Ø   Reagents:- ·          Iodine Resublimed ·          Starch Indicator ·          Arsenic Trioxide (A.R. Grade) ·          Potassium Iodide (A.R Grade) ·          Hydrochloric Acid (A.R Grade) Ø   Preparation of Solution:- ·          0.1 (N) Iodine Solution:-   Weight accurately 14 g Iodine Resublimed in a 1000 ml volumetric flask and keep close with stopper. Then take accurately 36 g Potassium Iodide in 250 ml beaker and dissolve it in 100 ml DM water. Add the Potassium Iodide Solution along with 0.1 ml Hydrochloric Acid (A.R. Grade) to the 1000 ml volumetric flask and mix very well until complete dissolution. Then make up the volume up to 1000 ml with DM water. Then mix very well. Store it in amber coloured stopper bottle protected from light. ·          Starch Indicator:- Dissolve 0.1 g S
Read more

Method for Preparation and Standardization of 0.1 (N) Potassium Permanganate Solution

Image
  Ø    Ø  Apparatus:- ·          500 ml conical flask ·          1L Volumetric Flask ·          100 ml Cylinder ·          50 ml Burette ·          250 ml Beaker Ø   Reagents:- ·          Potassium Permanganate (A.R Grade) ·          Sodium Oxalate (A.R. Grade) ·          Sulphuric Acid (A.R Grade) Ø   Preparation of Solution:- ·          0.1 (N) Potassium Permanganate Solution:-  Weight accurately 3.3 g Potassium Permanganate (A.R. Grade) in a 1000 ml volumetric flask and dissolve with DM Water and make up to 1L with DM Water. Then heat on a steam bath for two hours. Cover and allow to stand for 24 hours. Filter through a Whatman 42 Filter paper, discarding the first 25 ml.  Store in an amber-coloured air tight bottle and protect against dust. If manganese dioxide precipitates on standing, re-filter and re-standardize before use. Ø   Standardization Procedure:- Take accurately in 500 ml conical flask about 0.2 g of primary standard Sodium Oxalate, previous
Read more

Method for Preparation and Standardization of 0.1 (N) Sodium Thiosulphate Solution

Image
  Ø   Apparatus:- ·          250 ml Iodine flask ·          100 ml cylinder ·          50 ml burette Ø   Reagents:- ·          Sodium Thiosulphate ·          Starch Indicator ·          Potassium dichromate (A.R. Grade) ·          Potassium Iodide (A.R Grade) ·          Hydrochloric Acid (A.R Grade) Ø   Preparation of Solution:- ·          0.1 (N) Sodium Thiosulphate:-   Weight accurately 25 g Sodium Thiosulphate and about 0.2 g Sodium Carbonate. Dissolve in 1000 ml DM water. ·          Starch Indicator:- Dissolve 0.1 g Starch in 100 ml by heating. Ø   Procedure:- Take accurately about 0.1 g of primary standard Potassium Dichromate, previously dried at 120°C for 4 hours . Dissolve in 100 ml of DM water 500 ml Iodine flask. Swirl to dissolve the solid, remove the stopper and quickly add 3 g Potassium Iodide and 5 ml Hydrochloric Acid. Insert the stopper and swirl to mix. Then allow to stand in dark for 30 minutes. Then rinse the stopper and the inner
Read more