Synthesis of Cu(OH)2 and CuO by soft chemistry
Résumé
The ternary diagram CuO-Na2O-H2O has been investigated, in order to understand the conditions of stability of Cu(OH)2 and CuO. Solubility curves and domains of pure solid phases, Na2Cu(OH)4 and CuO, have been determined. This study shows that CuO is less soluble than Cu(OH)2, the latter of which does not exist in equilibrium in the ternary system. Synthesis of pure Cu(OH)2, is achieved from Na2Cu(OH)4. This salt is diluted in a large amount of water and this procedure avoids the formation of CuO through the complex ion Cu(OH)4 2-. The synthesis of pure CuO, at room temperature, required a new route. Copper metal is oxidized by dioxygen in concentrated ammonia solutions. The solid obtained is relatively well-crystallized, despite the way of synthesis used.
Domaines
Chimie inorganiqueOrigine | Fichiers produits par l'(les) auteur(s) |
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