Experiment no 2

Preparation of Nickle dimethyl glyoxime complex and also calculate the percentage yield.

Apparatus:

·        Test tubes

·        Test tube stand

·        Test tube holder

·        250ml Beaker

·        Flask

·        Petri dish

·        Filter paper

·        Tripod stand

·        Chemicals

Chemicals:         

·        Nickle Sulphate

·        Ammonia Solution

·        Alcholic solution of dimethyl glyoxime

Reaction:

NiSO4.6H2O + 4NH4OH + C8H14O4N4  → (NH4)SO4 + 2H2O + red colour complex

  

Procedure:

First of all in the 250 ml beaker, 0.3 gm of NiSO4.6H2O was dissolved in the 100 ml of distilled water containing 5 ml 1:1 HCL solution. Than 10% ammonia solution was added in it dropwise until it gave smell of ammonia. After that 1% solution of dimethyl glyoxime was added drop wise until the completion of the precipitation. The solution was allowed to stand for 30-45 minute, than the solution was filtered and crystals were weighted after drying .Than the percentage yield was calculated.

Calculations and observation:

Theoratical yield:

262.7 gm of NiSO4.6H2O produces [Ni(C4H7O2N2)2] = 288.7 gm

1 gm of NiSO4.6H2O produces [Ni(C4H7O2N2)2] = 288.7/262.7 gm

0.3 gm of NiSO4.6H2O produces [Ni(C4H7O2N2)2] = 288.7/262.7*0.3 gm

= 0.329gm

Actual yield:

Wt.of filter paper = 1.26 gm

Wt.of filterpaper + complex = 1.54gm

Wt,.of complex = 1.54-1.26 = 0.28 gm

10 ml of NiSO4.6H2O produces [Ni(C4H7O2N2)2] = 0.28m

1 ml of NiSO4.6H2O produces [Ni(C4H7O2N2)2] = 0.28gm

100ml of NiSO4.6H2O produces [Ni(C4H7O2N2)2] = 0.28100 =  2.8gm

 % yield = 0.28/0.329*100 = 85 %