Preparation and standardisation of 0.1 M Ethanolic Potassium Hydroxide using Hydrochloric acid and Phenolphthalein solution used for pharmaceutical analysis.
Ethanolic Potassium Hydroxide Solution Preparation
- Dissolve about 6 g of potassium hydroxide in 5 ml of water.
- Add sufficient aldehyde-free ethanol (95 %) to produce 1000 ml.
- Allow the solution to stand in a tightly-stoppered bottle for 24 hours.
- Then quickly decant the clear supernatant liquid into a suitable, tightly-closed container.
- Standardize the solution in the following manner.
Ethanolic Potassium Hydroxide Solution Standardization
- Pipette 20.0 ml of 0.1 M hydrochloric acid into a flask.
- Dilute with 50 ml of water and add 0.1 ml of phenolphthalein solution.
- Titrate with the ethanolic potassium hydroxide solution until a permanent pale pink color is produced.
- Store protected from light and moisture.
- 1 ml of 0.1 M hydrochloric acid is equivalent to 0.00561 g of KOH.
Also see:
Determination of Shelf Life of Solutions in Laboratory
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