Preparation and standardisation of 0.05 M Bromine solution using Sodium Thiosulphate and 3 ml of Starch solution as indicator that is used in chemical analysis of pharmaceutical substances.
Bromine Solution Preparation
- Dissolve 3 g of potassium bromate and 15 g of potassium bromide in sufficient water to produce 1000 ml.
- Standardize the solution in the following manner.
Bromine Solution Standardization
- Pipette 25.0 ml of the solution into a 500 ml iodine flask and dilute with 120 ml of water.
- Add 5 ml of hydrochloric acid, insert the stopper in the flask and shake it gently.
- Add 5 ml of potassium iodide solution, again insert the stopper and allow it to stand for 5 minutes in the dark.
- Titrate the liberated iodine with 0.1 M sodium thiosulphate using 3 ml of starch solution, added towards the end of the titration, as an indicator.
- 1 ml of 0.1 M sodium thiosulphate is equivalent to 0.01598 g of Br2.
- Store in dark amber-colored, glass-stoppered bottles.
Also see:
Determination of Shelf Life of Solutions in Laboratory
Visitors are also reading:
No comments: Read Comment Policy ▼
Post a Comment
Please don't spam. Comments having links would not be published.