Answer to Question #72372 in General Chemistry for Keeley Clark

Question

Briefly describe the three main stages involved in preparing a pure, solid sample of nickel chloride.

Answer 1

Nickel chloride is obtained operating of chlorine on heated to 600-800° C nickel, by dehydration of crystallohydrates NiCl2•nH2O (n=1, 2, 4, 6, 7). Industrial production of nickel chloride is mainly associated with the extraction of nickel from nickel-cobalt ores.
The degree of nickel extraction depends on the nature of nickel-containing compounds in the composition of ores and concentrates.
In a glass vessel of 1000 ml capacity, 260 ml of hydrochloric acid (density 1.17 g / cm3) is poured and 100 g nickel oxide is added with stirring. After dissolving the nickel (ll) oxide, 50 ml of water are added and, with stirring and heating, the solution is kept for 3.5 hours and then filtered. The filtered nickel chloride solution is evaporated to a density of 1.525 g /cm3 and crystallized. Before crystallization, hydrochloric acid is added to pH 2,8. The dropped crystals of nickel (ll) chloride NiCl2 • 6H2O are pressed on a centrifuge. The yield of crystals NiCl2•6H2O is 116.9 g. Next, dehydrate crystals.