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Copper(II) sulfate is an inorganic compound with the chemical formula Cu SO 4.It forms hydrates CuSO 4 ·nH 2 O, where n can range from 1 to 7. The pentahydrate (n = 5), a bright blue crystal, is the most commonly encountered hydrate of copper(II) sulfate, [10] while its anhydrous form is white. [11]
Chalcanthite (from Ancient Greek χάλκανθον (khálkanthon), from χαλκός (khalkós) 'copper' and ἄνθος (ánthos) 'flower, bloom') is a richly colored blue-green water-soluble sulfate mineral CuSO 4 ·5H 2 O.
It is easily recognisable, due to its distinct red-orange color. Copper also has a range of different organic and inorganic salts , having varying oxidation states ranging from (0,I) to (III). These salts (mostly the (II) salts) are often blue to green in color, rather than the orange color copper is known for.
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why does this substance change color from blue to green when water is added? It shouldn't. Copper (II) Sulfate forms a light blue solution. If the water has a lot of chloride ions in it, a complex ion may be formed that would make the solution green. --24.16.154.50 00:05, 12 January 2007 (UTC)
It is fairly soluble in water. The brilliant dark blue-violet color of tetraamminecopper(II) sulfate solution is due to presence of [Cu(NH 3) 4] 2+ (tetraamminecopper(II) cation). Often, the dark blue-violet color is used as a positive test to verify the presence of Cu 2+ in a solution.
As for its color, the company said it is "a visual aid for pilots and firefighters alike." After a few days of exposure to sunlight, the colour fades to earth tones, it said.
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