How to Prepared and Standardize of 0.1 N Cerric Ammonium Nitrate Volumetric Solution

How to Prepared and Standardize of 0.1 N Cerric Ammonium Nitrate Volumetric Solution

                                                        

                                                            

Preparation of 0.1 Cerric Ammonium Nitrate Volumetric solution

➤ Glass ware and instruments required.

Beaker, Glass stirrer, Graduated Pipettes, Graduated cylinder, Analytical balance, Sucker, Volumetric flask, Burette, Conical Flask, Fume hood.

➤ Reagents required.

Cerric Ammonium Nitrate Reagent Grade

Molecular Wt. :- Ce(NO₃)₄.2NH₄NO₃,   548.22

Sulphuric Acid Reagent grade,

Arsenic trioxide PS Previosly dried for 1 hour at 105°, 

Sodium Hydroxide,

Sulphuric Acid Dilute,

Osmic solution acid solution,

Ferroin sulphate solution.

➤ Preparation.

Shake a solution containing 56 ml of sulphuric acid reagent grade and 54.82 g of ceric ammonium nitrate reagent grade for 2 minutes and carefully add 5 successive 100 ml quantities of water, shaking after each addition. Dilute the clear solution to 1000 ml with water. Standardize the solution after 10 days. On the day of use, standardize the solution.

➤ Standardization.

Accurately weigh about 0.2 g arsenic trioxide PS, previously dried for one hour at 105°,  in 500 ml conical flask. Wash down the inner walls of the flask with 25 ml of 8% 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 ferroin sulphate solution. Titrate the solution with 0.1 N / 0.1 M ceric ammonium nitrate solution until the pink colour of the solutiom changes sharply to pale blue.

➤ Calculations.

                                                   g  AS₂O₃  x  0.1

             N / M =    --------------------------------------------------

                                     0.004946  x   Burette reading in ml