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What (who) is cuprammonium - definition
CHEMICAL COMPOUND
Tetraamminecopper dihydroxide; Schweizer's solution; Tetramine copper hydroxide; Tetraaminecopper hydroxide; Cuprammonium; Tetraamminediaquacopper dihydroxide
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4(OH)2.png?width=200 "Aqueous solution of Schweizer's reagent")
cuprammonium
[?kju:pr?'m??n??m]
¦ noun [as modifier] Chemistry of or denoting a complex ion containing copper bonded to ammonia, solutions of which are deep blue in colour and able to dissolve cellulose.
Cuprammonium rayon
REGENERATED FIBRE FROM CELLULOSE DISSOLVED IN CUPRAMMONIUM SOLUTION
Cupro
Cuprammonium rayon is a rayon fiber made from cellulose dissolved in a cuprammonium solution, Schweizer's reagent.
cupro
REGENERATED FIBRE FROM CELLULOSE DISSOLVED IN CUPRAMMONIUM SOLUTION
Cupro
['k(j)u:pr??]
¦ noun a type of rayon made by dissolving cotton cellulose with cuprammonium salts and spinning the resulting solution into filaments.
Origin
1980s: an invented word, prob. from cuprammonium.
Wikipedia
Schweizer's reagent
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Schweizer's reagent is the metal ammine complex with the formula [Cu(NH3)4(H2O)2](OH)2. This deep-blue compound is used in purifying cellulose.
It is prepared by dissolving copper(II) hydroxide in a solution of ammonia.
It forms an azure solution. Evaporation of these solutions leaves light blue residue of copper hydroxide, reflecting the lability of the copper-ammonia bonding. If conducted under a stream of ammonia, then deep blue needle-like crystals of the tetrammine form. In presence of oxygen, concentrated solutions give rise to nitrites Cu(NO2)2(NH3)n. The nitrite results from oxidation of the ammonia.
