[LAB] Preparation and Standardisation of 0.1N ceric ammonium sulphate

Aim

To prepare and standardise 0.1 N Ceric Ammonium Sulphate

Chemical Requirements

  1. Ceric Ammonium sulphate
  2. Sulphuric acid
  3. Arsenic Trioxide
  4. Sodium hydroxide
  5. dil Sulphuric acid
  6. Osmic acid
  7. Ferroin sulphate (or) N-Phenyl anthranilic acid

Apparatus

  1. Burette
  2. Conical flask
  3. Measuring Jar
  4. Volumetric Flask
  5. Glass rod

Procedure:

Preparation of 0.1N ceric ammonium sulphate

  1. 66gm of ceric ammonium sulphate was dissolved with gentle heat in a mixture of 30 ml of sulphuric acid and 500 ml of water
  2. The mixture was cooled and filtered
  3. The resulting solution was diluted to 1000ml with water

Standardisation of 0.1 N Ceric Ammonium Sulphate

  1. About 0.2 gm of Arsenic trioxide which was previously dried for about an hour was accurately weighed and transferred into a 500 ml conical flask.
  2. The inner walls of the flask were washed with 100 ml of water and mixed thoroughly
  3. Then 300 ml of dil. sulphuric acid , 0.15 ml of osmic acid, 0.1 ml of ferroin sulphate indicator were added
  4. Titration was carried out until pink colour of solution changed to pale blue or yellowish green colour

Each ml of 0.1 N ceric ammonium sulphate ~ 0.6326 gm of ceric ammonium sulphate ~ 4.946 grams of arsenic trioxide

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