Nickel(II) nitrate (nickelous nitrate)

Properties and structure

In solid form nickel(II) nitrate is typically a hygroscopic crystalline material. The Ni2+ center adopts an octahedral coordination geometry in many hydrated forms. The salt dissolves readily in water and polar organic solvents to give solutions of nickel(II) ions. On heating, nitrate salts decompose, releasing nitrogen oxides and leaving nickel oxide as a residue. For details on the metal itself see nickel information.

Preparation and reactions

Laboratory and industrial preparations generally involve reacting nickel metal, nickel carbonate, or nickel hydroxide with nitric acid to produce the nitrate and water. The resulting solutions can be concentrated to give crystalline hydrates. Chemically, nickel(II) nitrate can act as a source of Ni2+ in coordination chemistry, as an oxidizing component in some formulations, and as a precursor that yields nickel oxide upon calcination. Additional procedural guidance is available at preparation notes.

Uses and applications

• Precursor to nickel-based catalysts and nickel oxide materials used in ceramics and electronics.
• Source of nickel ions in laboratory syntheses and coordination compound preparation.
• Occasionally used in electrochemical processes and in formulations for certain plating or surface treatments.
• Commercial and research use as an analytical reagent and in materials science studies.

Further practical examples and supplier data are often listed in technical resources such as product information.

Safety, handling and distinctions

Nickel(II) nitrate is an oxidizing salt and should be kept away from organic materials and reducing agents. Like many soluble nickel salts it is hazardous: exposure can cause irritation and sensitization, and some nickel compounds are associated with long-term health risks. Work should be carried out with appropriate personal protective equipment and engineering controls; consult a safety data sheet and local regulations for disposal instructions. See safety guidance at handling and disposal.

Distinguishing this nitrate from other nickel salts (such as the sulfate or chloride) is important because solubility, anion effects, and reactivity differ. Hydrate state, purity and concentration strongly influence properties and intended use, so users select the form that fits their chemical or industrial application.