Disodium Edetate Solution Preparation
- Take about 100 ml of water in a cleaned and dried 1000 ml volumetric flask.
- Add about 37.2 gm of Disodium Edetate with continues stirring.
- Add more about 700 ml of water mix.
- Make up the volume 1000 ml with water. Mix the solution thoroughly.
- Keep the solution for at least one hour and then carry out the standardization.
Disodium Edetate Solution Standardization
- Weigh accurately about 400 mg of Calcium Carbonate.
- Previously dried at about 110°C for about 2 hours.
- Transfer it in a cleaned and dried 500 ml conical flask and add about 10 ml of water with gentle stirring to form the slurry.
- Dissolve the carbonate in 2 ml of dilute hydrochloric acid and shake well until it dissolves.
- Add 100 ml water through the inner surface of the flask with the stirring of the solution.
- Add 30 ml of 0.1 M Disodium Edetate (prepared) from the burette with constant stirring.
- Add 15 ml of Sodium Hydroxide solution with constant stirring.
- Add 300 mg of Hydroxy Naphthol Blue solution as an indicator.
- Add 0.1 M Disodium Edetate (prepared) with constant stirring and titrate it until the solution gives a blue color.
- Calculate the molarity by the following formula:
M = ----------------------
BR x 100.09
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