Copper (II) nitrate, likewise known together cupric nitrate, is an not natural salt recognized for its an extremely brilliant blue shade that is provided as catalyst in several reactions.
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Formula and structure: Copper (II) nitrate chemical formula is Cu(NO3)2. The structure of the anhydrous salt is developed by one cation Cu2+ and two anions NO3-. The compound reflects up to 5 different hydrate forms, being the trihydrated Cu(NO3)2.3H2O and also the pentahydrated Cu(NO 3)2.5H2O salts the most common. The molar fixed of the anhydrous type is 187.55 g mol-1 while the trihydrate type is 241.60 g mol-1. Its chemical structure can be created as below, in the typical representations provided for essential molecules.
Occurrence: Copper (II) nitrate and also other copper nitrates are discovered in organic as component of part minerals as gerhardtite and also rouaite.
Preparation: Copper (II) nitrate is prepared from metallic cupper treated v nitric acid. The can additionally be produced by dealing with metallic copper through dinitrogen tetroxide:
Cu + 4 HNO3 → Cu(NO3)2 + 2 H2O + 2 NO2
Cu + 2 N2O4 → Cu(NO3)2 + 2 NO
Physical properties: Copper (II) nitrate in all the hydrated forms is a blue, hygroscopic, crystalline solid. The density varies according to the hydration, being 3.05 g mL-1 (anhydrous), 2.32 g mL-1 (trihydrate) or 2.07 g mL-1 (hexahydrate). The melting points space 256 °C because that the anhydrous, 114.5 °C (trihydrate) and 26.5 °C (hexahydrate). Most of them decomposes in ~ high temperatures. The three creates are highly soluble in water, ammonia and also ethanol. They are insoluble in organic solvents as ethyl acetate.
Chemical properties: Copper (II) nitrate suffer countless interesting reaction in chemical synthesis. Among this reaction is the preparation of cupric oxide by pyrolysis above 180 °C:
2 Cu(NO3)2 → 2 CuO + 4 NO2 + O2
Copper (II) nitrate can react v acetic anhydride come induce the nitration of aromatic compounds such together benzene.
Uses: Copper (II) nitrate have the right to be offered in the production of pyrotechnics and also blue colors and also coats. It is likewise used as a classical demonstration of the voltaic cell due to the oxidation reaction in between the copper (II) nitrate and also one copper electrode. Copper (II) nitrate is also uses in the manufacturing of copper (II) oxide.
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Health results / safety hazards: Copper (II) nitrate is harmful for health. The can reason irritation in throat, lungs, skin and also eyes. The is noncombustible, yet when mixture v wood, document and other combustibles, it can burn.