Hydrochloric acid Solution Preparation
- Take about 100 ml of water in a cleaned and dried 1000 ml volumetric flask.
- Add about 8.5 ml of Conc. Hydrochloric acid with continuous stirring.
- Add more about 700 ml of water, mix and allow to cool to room temperature.
- Make up the volume 1000 ml with water. Mix solution thoroughly.
- Keep the solution for at least one hour and then carry out the standardization.
Hydrochloric acid Solution Standardization
- Accurately weigh about 0.5 g of THAM (Tris (hydroxymethyl)-amino methane (tromethamine), previously dried at 105° for 3 hours and cooled in a desiccator, transfer to a conical flask.
- Dissolve in 50 ml of distilled water.
- Add 2 drops of Bromocresol Green indicator.
- Titrate with 0.1M Hydrochloric acid to a pale yellow endpoint.
- Each 121.14 mg of tromethamine is equivalent to 1 ml of 0.1M hydrochloric acid.
- Calculate the molarity by the following formula:
M = ---------------------
121.14 x HCl in ml
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