Prepare 0.1 mol/l Ammonium Thiocyanate Solution

General Information:

     One liter of this solution contains 7.612 g of ammonium thiocyanate
      (NH4SCN, molecular weight: 76.12).

 Procedure:

    *Weigh about 8 g of ammonium thiocyanate and dissolve in 1,000 ml of water. This solution  may be replaced by 0.1 mol/l potassium thiocyanate.  

Standardization:   

  1. Measure exactly 30 ml of 0.1 mol/l silver nitrate, and transfer into a flask with a   

      ground-glass  stopper. 

  2. Add 50 ml of water, 2 ml of nitric acid, and 2 ml of ferric ammonium sulfate TS, and titrate 

      with 0.1 mol/l ammonium thiocyanate while shaking until a red-brown color persists.