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What compound is formed when dilute hydrochloric acid is added to a beaker containing a small amount of copper oxide?
Copper(IV) chloride
Copper(II) chloride
Copper(III) chloride
Copper(I) chloride
Copper(II) chloride
When dilute hydrochloric acid (HCl) is added to copper(II) oxide (CuO), a neutralisation reaction takes place. This reaction forms a blue-green solution of copper(II) chloride (CuCl2тАЛ) and water (H2тАЛO).
When dilute hydrochloric acid (HCl) is added to copper(II) oxide (CuO), a neutralisation reaction takes place. This reaction forms a blue-green solution of copper(II) chloride (CuCl2тАЛ) and water (H2тАЛO).
This is similar to cleaning tarnished copper or brass utensils with lemon juice or vinegar; the acid reacts with the metal oxide coating on the surface to form soluble salts, washing away the tarnish.
Remember: Basic Oxide + Acid тЖТ Salt + Water (BOASW)
CuO+2HClтЖТCuCl2тАЛ+H2тАЛO тАФ Balanced neutralisation equation
Cu2++2ClтИТтЖТCuCl2тАЛ тАФ Formation of copper(II) chloride
Copper(II) oxide is a basic metal oxide. When it reacts with hydrochloric acid (a mineral acid), a salt and water are produced. The chemical equation is given by: CuO(s)+2HCl(aq)тЖТCuCl2тАЛ(aq)+H2тАЛO(l). The characteristic blue-green color of the resulting solution is due to the formation of aqueous copper(II) ions (Cu2+).
Copper(II) oxide (CuO) is a black-coloured basic oxide.
Metal oxides react with dilute acids to form salt and water.
The solution turns blue-green due to the formation of copper(II) chloride (CuCl2тАЛ).
This is an example of a neutralisation reaction between a metallic oxide and a mineral acid.
Demonstrates the basic nature of transition metal oxides.
Clearly shows colour change as an indicator of chemical change.
Etching of metals and printed circuit board (PCB) manufacturing.
Catalyst in various organic synthesis reactions.
Copper(I) chloride (Cu┬аCl) exists with copper in +1 oxidation state, but it is white and insoluble in water under normal conditions.
Option B is correct because copper typically forms +2 oxidation state compounds in aqueous chloride solutions like CuCl2тАЛ.
B is correct тАФ Copper(II) chloride is formed when dilute hydrochloric acid reacts with copper oxide.
Always remember that metallic oxides are basic in nature and react with acids to form salt and water, just like metal hydroxides and carbonates.
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