Question

What happens when dilute $HCl$ is added to copper oxide? In what way is this reaction similar to the reaction of acid with base? And what do you conclude by this?

Answer 1

$CuO+2HCl\to {CuCl}_2+H_{2}O$

ionic equation

$CuO+{2H}^{+}+2{Cl}^{-}\to {Cu}^{2+}+2{Cl}^{-}+H_{2}O$

$\Rightarrow CuO+{2H}^{+}\to {Cu}^{2+}+H_{2}O$

thus, it is similar to that of acid to base reaction as it's $r\times n$ b/w oxide $Cu$ hydroniumium.

Copper oxide is a base.