Preparation of sodium cobalt nitrite
150 g of sodium nitrate melt by heat in 150 ml of distilled water, the solution is cooled to 50-60 ° C and add 50 g of nitrate kobalnatého. After stirring are added in small portions 50 ml 50% acetic acid,
and to oxidize the divalent cobalt, are discharged through a mixture of a strong current of air. If the underlying contaminated with potassium salt excreted yellow precipitate
hexanitrokobaltitanu potassium. After desist mixture filtered. To the filtrate pour 350 ml of 96% ethanol let stand for 2 hours. Zvniklou The precipitate collected, washed
Two to three times with small doses of alcohol and ether. Arose preparation dissolved in 1.5 times the amount of water and vysrážíme mixture of acetic acid + ethanol (1:70). The resulting precipitate
sucked washed with ethanol, ether and dry.