RD Chemical Company - Manufacturing Chemists

Determination of Free Acidity as Hydrochloric Acid in Ferric Chloride Solution (RDM-5003)

Procedure for Analysis

Theory:
Ferric iron is complexed with Potassium Fluoride to prevent hydrolysis. The free acid is then titrated with standard Sodium Hydroxide to the Phenolphthalein end point.

Reagents Required:

Phenolphthalein
Sodium Hydroxide (NaOH) standard 0.10N solution.
33% Potassium Fluoride, neutralized to Phenolphthalein endpoint.

Procedure:

1. In 150 ml beaker, weigh accurately 1-2 grams of ferric chloride solution. Add 50 ml of distilled water.
2. Add 25 ml of Potassium Fluoride solution and mix.
3. Add few drops Phenolphthalein indicator
4. Titrate with 0.1N NaOH to first permanent trace of pink

Calculation:
% Free acidity as HCl = mls 0.1N NaOH x 0.365 grams of sample

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