Preparation and Standardization of 0.1 M Disodium Edetate (EDTA)

Preparation and Standardization of 0.1 M Disodium Edetate (EDTA) 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 solution thoroughly. · Keep the solution for atleast one hour and than carryout the standardization. Standardization: · Weigh accurately about 400 mg of Calcium Carbonate. · Previously dried at about 110°C for about 2 hour. · Transfer it in a cleaned and dried 500 ml conical flask and add about 10 ml of water with gentle stirring to form slurry. · Dissolve the carbonate in 2 ml of dilute hydrochloric acid and shake well until it dissolve. · Add 100 ml water through inner surface of the flask with the stirring of 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 nephthol blue solution as a indicator. · Add 0.1 M Disodium edetate (Prepared) with constant stirring and titrate it until the solution gives blue colour. W x 1000 Molarity of 0.1 M Disodium edetate = ---------------------- BR x 100.09