How to Prepared and Standardize of 0.1 N Ammonium Thiocynate Volumetric Solution

How to Prepared and Standardize of 0.1 N Ammonium Thiocynate Volumetric Solution

                                                             

Preparation of 0.1 Ammonium Thiocynate 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.

Ammonium Thiocynate Reagent Grade

Molecular Wt. :- NH4SCN,76.12

Silver nitrate Volumetric Solution (0.1 N),

Nitric Acid, 
Ferric Ammonium Sulfate Solution.

➤ Preparation.

Weigh about 8 g of ammonium thiocynate reagent grade in 1000 ml volumetric flask. Dissolve and dilute with water. Filter the solution, if it is not clear.

➤ Standardization.

Pipette out 25 ml of standard 0.1 N silver nitrate VS into glass stoppered flask. Dilute with 50 ml of water, then add 2 ml of nitric acid and 2 ml of ferric ammonium sulphate solution, and titrate with the ammonium thiocynate solution to the first appearance of red brown colour. Note this final end point as burette reading in ml. 

➤ Calculations.

                              ml   AgNO₃  x  N / M  AgNO₃

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

                       ml  NH₄SCN solution  [ Burette reading in ml ]