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Characteristic reactions of Cu²⁺ Most common oxidation states: +1, +2 M.P. 1083º B.P. 2582º density 8.92 g/cm3

Characteristic reactions of Cu²⁺

The +2 oxidation state is more common than the +1. Copper(II) is commonly found as the blue hydrated ion, (ce^2+).

Bạn đang xem: Cu2 + naoh = cu(oh) + na


Aqueous Ammonia

Copper(II) ion reacts with stoichiometric quantities of aqueous ammonia to precipitate light blue Cu(OH)2. Some basic salts may also form.

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The precipitate dissolves in excess ammonia to size a dark xanh complex ion:

2+(aq) + 2OH-(aq) >

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Potassium Ferrocyanide

Potassium ferrocyanide precipitates red-brown copper(II) ferrocyanide from Cu2+ solutions:

4-(aq) Cu2(s)>

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This test is very sensitive. The precipitate is soluble in aqueous ammonia.

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Note: Many metal ions size ferrocyanide precipitates, so potassium ferrocyanide is not a good reagent for separating metal ions. It is used more commonly as a confirmatory test.