EXP.2Preparation of

Bis(ethylenediamine)copper(II) Nitrate

[Cu(en)2(]3NO)2

Reaction Equation :

Cu(NO3)2 + 2(en) → [Cu(en)2](NO3O)2Where en = H2N—CH2—CH2—NH2

Suggested Structure:

•Coordination no:

The shape of the complex:

Reaction Equation: Cu(NO3)2 + 2(en) → [Cu(en)2](NO3O)2Where en = H2N—CH2—CH2—NH2

Experimental Procedure :

•1 -Dissolve approximately 6 g of well pulverized Cu(NO3)2 3H2O, weighed to the nearest 0.01 g, in 38 ⋅

ml 95% ethanol in a 250-ml beaker .•.2 -Cool the solution in an ice bath for 15 min.

.3 -Add, with constant stirring, about 4.0 ml anhydrous ethylenediamine, C2H4(NH2)2, to the ice cold solution (ethylenediamine stinks and is very hard on skin, therefore use under the hood and take care!).

•4 -Suction-filter off the violet-blue product, using a Büchner funnel

•5 -Wash the product with 25 -ml portions of ether (CAUTION: ether is very flammable, make certain no open flames are in

the vicinity) .•6 -Weigh the air-dried crystals.

Experimental Calculations:1- Theoretical weight of the precipitate

=

= = gm

2- Experimental weight of the precipitate = gm.

3- Yield of the reaction = X 100

= X 100 = %

4- Percentage weight of each element = X 100

= X 100 = %

Molecular weight of the product X Weight of the reacted substance

Molecular weight of the reacted substance

Experimental weight of the precipitate

Theoretical weight of the precipitate

Molecular weight of the complex

Its atomic weight X no of its atoms

X