Weigh out 7.0g of CUSO4.5H20 on a triple-beam or other rough balance.weigh the solid either on a clean piece of paper without coloured strips or a small beaker and not directly on the balance pan.Transfer the solid copper sulphate to a 125ml erlenmeyer flask and add 15ml of water.heat the flask to dissolve the solid,then cool to room temperature.carry out the remaining steps under the hood..add concentrated ammonia solution,a few ml at a time shaking the flask constantly untill the first precipitate has completely dissolved.All the copper should now be present in the solution as complex ion ''TETRAAMINECOPPER[II]...The sulphate salt of this complex cation can be precipitated by the addition of a liquid such as methanol in which the ''TETRAAMINECOPPER[II]SULPHATE MONOHYDRATE is insoluble..Add 10ml of methanol to the solution,this should result in the formation of deep blue precipitate of the above complex.Filter the solution through a buchner funnel by suction drying..Dry the solid by pressing it between two pieces of filter paper..Transfer the dried crystals to a weighed test tube and re-weigh..then determine the percentage yield...percentage yield= actual yield/theoretical yield * 100%.....