Tools: 100 ml conical flask, stopper with Bunsenovýrn valve (incised longitudinally rubber tube, which is an increase of internal pressure deforms and releases excess volume of gas)
Chemicals: Ammonium vanadate, sulfuric acid, zinc granules, zinc powder
Procedure: in the conical flask of 100 ml Dissolve 0.2 g of ammonium vanadate in 40
ml of 5% sulfuric acid.
To add a solution of zinc granules, gently shake flask and observe whether
in it there is a color change.
Once the first change, add to the flask and 1 g of zinc powder flask
stopper with a Bunsen valve.
Mix in a flask vigorously and observe color changes.
The gradual reduction in 5 + to the V 2 + zinc sulphate produced colored vanadium. NH 4 VO 3 , (VO) SO 4 and V 2 (SO 4 ) 3 and the VSO 4 - yellow, blue, green, purple
Ammonium vanadate is typically unavailable chemicals. In a strongly acidic pH of 0-1 in the solution present polyvanadičnany having intensely red.