Nickel(II) sulfate
Nickel sulfate
- 7786-81-4 (anhydrous)
- 10101-97-0 (hexahydrate )
- 10101-98-1 ( heptahydrate )
- Anhydrous: yellow crystals
- Hexahydrate: odorless, emerald green to blue crystals
- Anhydrous: 154.756 g · mol -1
- Hexahydrate: 262.8477 g · mol -1
Fixed
- Anhydrous: 3.68 g · cm -3
- Hexahydrate: 2.07 g · cm -3
Hexahydrate: 53 ° C
Thermal decomposition: 840 ° C
650 g · l-1 in water (20 ° C)
Risk
264 mg · kg -1 ( LD50, rat, oral)
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Nickel ( II) sulphate is the nickel salt of the sulfuric acid. It consists of one nickel cation ( Ni2 ) and a sulfate anion ( SO42 - ). When heated above 840 ° C decomposition occurs with the formation of toxic vapors ( nickel monoxide, sulfur trioxide ). In aqueous solution of nickel ( II ) sulfate forms weak acids.
Occurrence
In nature, the heptahydrate of the nickel ( II) sulfate is present as mineral Morenosit.
Representation
Nickel ( II) sulfate may be represented by the reaction of nickel with dilute sulfuric acid followed by crystallization.
Hydrates
Nickel (II ) sulfate exists in addition to the anhydrous form as hepta-and hexahydrate. The heptahydrate is in the form of dark green crystals. At 31.5 ° C from the heptahydrate hexahydrate, which is emerald green to blue. The anhydrous, yellow form occurs at temperatures above 103 ° C.
Use
Nickel ( II) sulfate is the most important technical nickel compound. It is used for the preparation of other catalysts and nickel compound. The aqueous solutions of nickel ( II) sulfate and nickel ( II) chloride, NiCl2 are used for the galvanic deposition of metallic nickel layers. Furthermore, it is used as a mordant in dyeing, and in the production of gas masks.
Safety
Nickel (II ) sulfate was classified as a known human carcinogen (category 1) ( Rule 905 ). The substance can cause contact allergies. Following ingestion occur irritation of the digestive tract.