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Preparation and Standardization of 0.1 M Ceric Ammonium Nitrate

Learn how to prepare and standardize 0.1 M Ceric Ammonium Nitrate using Arsenic Trioxide and Ferrroin Sulphate solution as indicator.


•  Shake a solution containing 56 ml of sulphuric acid and 54.82 g of ceric ammonium nitrate for 2 minutes.
•  Carefully add five successive quantities, each of 100 ml, of water, shaking after each addition.
•  Dilute the clear solution to 1000 ml with water.


•  Weigh accurately about 0.2 g of arsenic trioxide, previously dried at 105° for 1 hour, and transferred to a 500 ml conical flask.
•  Wash down the inner walls of the flask with 25 ml of a 8.0 % w/v solution of sodium hydroxide, swirl to dissolve, add 100 ml of water and mix.
•  Add 30 ml of dilute sulphuric acid, 0.15 ml of osmic acid solution, 0.1 ml of ferrroin sulphate solution.
•  Titrate with the ceric ammonium nitrate solution until the pink color is changed to a very pale blue, adding the titrant slowly towards the end-point.
•  1 ml of 0.1 M ceric ammonium nitrate is equivalent to 0.004946 g of As2O3.
•  Store protected from light.
•  Calculate molarity of solution by following formula:

                           As2O3 in mg
M = ----------------------------------------------------
         Ceric Ammonium Nitrate in ml  x 4.946

Also see: Determination of Shelf Life of Solutions in Laboratory

Ankur Choudhary is India's first professional pharmaceutical blogger, author and founder of Pharmaceutical Guidelines, a widely-read pharmaceutical blog since 2008. Sign-up for the free email updates for your daily dose of pharmaceutical tips.
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