Cupric carbonate
Method: A spatula was used to place 1g of Zinc sulphate into a test tube. Distilled water was used to dampen the red and blue litmus paper. Using the flame of the Bunsen burner the splint was lit and then blown out leaving a glowing splint. The tongs was used to hold the test tube over the lit Bunsen burner and the blue and red litmus paper was held at the opening of the test tube. The glowing splint was then placed inside test tube. Observations relating to the red and blue litmus and the glowing splint were then recorded. This was repeated for the other substances.
Results:
Discussion: The solids that changed colour when heated are cupric carbonate, copper(II) sulphate and lead(II) nitrate. The solids that evolved water vapor upon heating were cupric carbonate and copper(II) sulphate, this was proven by the formation of water droplets. The solid that underwent sublimation is ammonium chloride. Sublimation is the process by which a solid transforms directly to a gas. The only solid that gave off oxygen while heating was the lead(II) nitrate this was proven when the glowing splint relit when it was placed inside the test tube. The solids that gave off and acidic gas upon heating was Zinc sulphate, ammonium chloride, lead(II) nitrate, copper (II) sulphate and cupric carbonate.
Sorce of error: The blue litmus paper turned red when it was set down on the table so more litmus paper had to be moistened before continuing.
Conclusion: After heating substances these were formed -
Lead(II) nitrate 2Pb(No3)2(s) +heat→ 2PbO(s) + 4NO2(g) + O2(g)
Copper (II) sulphate CuSO4.5H2O+heat→ CuSO4+5H2O
Ammonium chloride NH4Cl (g)+heat→ NH3 (g) + HCl (g)
Zinc sulphate 2ZnSO4 + heat→ 2ZnO + 2SO2 + O2
Cupric carbonate CuCO3+ heat→ CuO + CO2