Copper sulphate production experiment. Spatula being used to add copper carbonate (green, CuCO3) to sulphuric acid (H2SO4). The products of this reaction are copper sulphate (blue, CuSO4), water (H2O), and carbon dioxide gas (bubbles, CO2). This is part of a general class of reactions, where a metal carbonate and acid produce a metal salt and water and carbon dioxide.