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This contains all the tests in a tabulated way required for detecting salts which are in the course of class xi and xii cbse .So that it can be memorized with ease. Provided by http://www.lo…Full description
EXPERIMENT NO. 2 AIM:- Prepare M/20 solution of ferrous ammonium sulphate (Mohr salt ).using this solution find out the Molarity and strength of given KMnO4 solution. APPARATUS:Watch glass , weight box , fractional weight box , 250ml of beaker , glass rod , 100ml measuring flask , pipelte , burette , KmO4 , Mohr Salt . etc. Principle MOLECULAR EQUATIONS:2KMnO4 +
END POINT: Colourless to permanent light pink colour THEORY: - Molecular mass of Mohr salt FeSO4 (NH4)2SO4.6H2O =
392amu
Hence for preparing 100 ml of Mohr Salt solution Mohr Salt required W= M.m.V/1000 =1/20x392x100/1000 =1.96 gm. OBSERVATIONS:Weight of the Mohr Salt =1.96gm Volume of the Mohr Salt solution prepared =100ml Volume of Mohr Salt solution used in each titration = 10ml S.NO
Initial reading of the burette
Final reading of the burette
Volume of KmNO4 used
1
0.00
10.5ml
10.5
2 3
0.00 0.00
10.3ml 10.3ml
10.3 10.3 Concordant volume (X) =10.3 ml
CALCULATION:Concentration of Mohr Salt = 1/20 Molar mass of Mohr Salt =39 L KmNo4
Mohr Salt
n1M1V1 = n2M2V2 5xMxX=2x1/20x10 MX= 2x10/20x5xX M= 20/20x5x10.3 M=0.01 Molarity of KMnO4 is 0.01M Strength of KMnO4 strength in gm = 0.01x158 =1.58gm / litre Result: The strength of given KMnO4
