Nickel(II) chloride

Nickel(II) chloride is an inorganic salt with formula NiCl₂, occurring as an anhydrous solid and several hydrates. Its hydrated forms are typically green, while anhydrous material is yellow-brown.

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Nickel: Nickel is a silvery transition metal with atomic number 28 and common oxidation states including +2. Nickel supplies the +2 cation in NiCl₂.
Nickel(II) chloride hexahydrate: Nickel(II) chloride hexahydrate is the green crystalline compound NiCl₂·6H₂O. It is the common hydrated form, with water coordinated around nickel in the crystal.
Electroplating: Electroplating deposits a metal coating onto a conductive object using electric current. Nickel chloride can supply nickel ions in some nickel-plating baths.
Nickel allergy: Nickel allergy is an immune-mediated contact hypersensitivity to nickel exposure. Nickel compounds can contribute to sensitization, so skin contact matters.
Chloride: Chloride is the negatively charged ion Cl⁻, formed when chlorine gains one electron. Two chloride ions balance each Ni²⁺ ion in the salt.
Nickel(II) chloride dihydrate: Nickel(II) chloride dihydrate is a crystalline hydrate with formula NiCl₂·2H₂O. It is one defined lower-hydration form produced under suitable conditions.
Nickel electroforming: Nickel electroforming builds a self-supporting nickel object by electrodepositing metal onto a shaped mandrel. Nickel chloride is used in some electrolytes that support nickel deposition.
Nickel toxicity: Nickel toxicity is the harmful effect of excessive or particular forms of nickel exposure. Nickel(II) chloride is harmful if swallowed or inhaled and can damage health.
Ionic compound: An ionic compound is a substance whose constituent ions are held together by electrostatic attraction. NiCl₂ is built from nickel cations and chloride anions.
Crystal water: Crystal water is water incorporated into a crystalline solid in a definite or variable proportion. Heating removes water from hydrated nickel chloride and changes its composition.