Prepare 0.1 mol/l Ferrous Ammonium Sulfate Solution

General Information:

One liter of this solution contains 39.214 g of ferrous ammonium sulfate (Fe(NH4)2(SO4)2ŋ6H2O, molecular weight: 392.14).

Procedure:
    Weigh 40 g of ferrous ammonium sulfate, dissolve in 100 ml of cooled, diluted sulfuric acid and add water to make 1,000 ml.
 

Standardization:  

    Measure exactly 25 ml of 0.1 mol/l ferrous ammonium sulfate, and titrate with 0.1 mol/l ceric sulfate (indicator: 2 drops of o-phenanthroline TS) until the red color of the solution changes to light blue.