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Nickel Sulfate Hexahydrate: Nickel Dissolved in Sulphuric Acid, Crystallised Warm
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W. Oelen (Wikimedia Commons) · CC BY-SA 3.0
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Nickel Sulfate Hexahydrate: Nickel Dissolved in Sulphuric Acid, Crystallised Warm

Nickel sulfate, the turquoise salt of the nickel-plating bath, forms when nickel dissolves in sulphuric acid. Its common six-water crystals grow only between about 31 and 54 °C, so keep the dish warm while it crystallises. It is a carcinogen and a strong skin allergen: gloves, goggles and a mask, and no dust. The picture: nickel sulfate hexahydrate crystals.
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I-nickel sulfate hexahydrate

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Carbonyl Nickel by the Mond Process: Mond, 1891
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Carbonyl Nickel by the Mond Process: Mond, 1891

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Dilute Sulfuric Acid: Concentrated Acid Poured into Water
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Dilute Sulfuric Acid: Concentrated Acid Poured into Water

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