Nickel(II) selenate is a selenate of nickel with the chemical formula NiSeO4.
Preparation
Nickel(II) selenate can be produced by the reaction of nickel(II) carbonate and selenic acid.
Properties
Nickel(II) selenate hexahydrate is a green solid. It is tetragonal, space group P41212 (No. 92). At 100 °C, nickel(II) selenate hexahydrate slowly loses water to the tetrahydrate, with space group P21/n (No. 14). At 510 °C, nickel(II) selenate decomposes directly into nickel selenite, which on further heating decomposes into nickel(II) oxide and selenium dioxide.
It and potassium selenate are cooled and crystallized in hot aqueous solution to obtain the blue-green [Ni(H2O)6](SeO4)2.
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