For experiments to study the properties of salt, a white, water-insoluble powder with a greenish tint was issued.

For experiments to study the properties of salt, a white, water-insoluble powder with a greenish tint was issued. To determine its qualitative composition, the issued sleep was subjected to thermal decomposition, as a result of which two oxides were formed. one of them is a black powder nui additions to which a solution of sulfuric acid and subsequent heating the image. The solution is blue. The other is known to be heavier than air, colorless and odorless. Write down the chemical formula

CuCO3 = CuO + CO2
CuO is a black powder.
CO2 is a colorless and odorless gas.
CuO + H2SO4 = H2O = CuSO4
CuSO4 is a substance whose solution is blue.