Division 3.6.2

Ammonium monovanadate solution: dissolve 2,35 g of ammonium monovanadate NH₄VO₃ in 400 ml of hot water. Stirring constantly, slowly add 20 ml of dilute nitric acid (7 ml of HNO₃ (3.4) + 13 ml of H₂O and make up to 1 litre with water.