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Preparation and Standardization of 0.1 M Ethanolic Potassium Hydroxide


Learn how to prepare and standardize 0.1 M Ethanolic Potassium Hydroxide using Hydrochloric acid and Phenolphthalein 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.

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.




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