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« Determination of Free Acidity as Hydrochloric Acid in Ferric Chloride Solution RDM-5006 | Main | Determination of Free Acid in Ferric Etchants RDM-5001 »
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Dec112009

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

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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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