Question

on adding dilute hydrochloric acid to copper oxide powder, the solution formed is blue green .predict the new compound formed which imparts a blue green color to the solution?

Answer 1

#Hopefully it'll help...


•Copper does not react with HCl acid, but copper oxide does react. A metal-acid reaction is a redox reaction. Since copper has a higher reduction potential than hydrogen, it does not react with non-oxidising acids like HCl or dil.H2SO4.

But metal oxides are basic substances, and so they generally react with acids forming respective salt and water. Such acid-base type reactions (neutralisation) are non-redox in nature.

Copper oxide is a weak base, and it easily reacts with HCl forming soluble copper(II) chloride and water.

CuO(s) + 2HCl(aq) = CuCl2(aq) + H2O(l)

Answer 2

the new compound formed is copper(ll)chloride or CuCl2.

The above pic is of CuCl2.

Eq^n=>CuO+2HCl=CuCl2+H2O

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