# What would we see in the reaction between copper carbonate and concentrated hydrochloric acid?

$C u C {O}_{3} \left(s\right) + 2 H C l \left(a q\right) \rightarrow C u C {l}_{2} \left(a q\right) + C {O}_{2} \left(g\right) \uparrow + {H}_{2} O \left(a q\right)$
There should be no copper carbonate in hydrochloric acid; the carbonate ion is chemically decomposed. Of course, there will be residual metal and non-metal ions. ${\left[C u {\left(O {H}_{2}\right)}_{6}\right]}^{2 +}$ has a beautiful blue colour; ${\left[C u C {l}_{4}\right]}^{2 -}$ is yellow green, and this will be the likely colour in conc. hydrochloric acid.