Synthesis of Copper(II) azide

Dissolve 10 g of sodium azide in 90 mL of water, 20 g of copper sulfate pentahydrate in 160 mL of water. Cool down the copper sulfate solution and start adding it gradually with stirring to the azide solution in an ice bath. Filter and wash with 200 mL of water, dry it on the vacuum filtration apparatus while leaving it somehow wet and transfer it to kerosene for storage.

CuSO4 + 2 NaN3 = Cu(N3)2 + Na2SO4

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