Carbonate Decomposition
Aim: To investigate the decomposition of a carbonate.
Equipment:
· Copper Carbonate (CuCO3)
· Limewater
· Bunsen Burner
· Matches
· Test tubes
· Clamp and stand
· Hydrochloric Acid
· Electronic Scales
Method:
1. Weighed Copper Carbonate by taring empty test tube.
2. Placed some Copper Carbonate in a test tube fitted with gas delivery tube
and stopper.
3. Clamped the test tube to the stand at a slight angle.
4. Half filled another test tube with limewater and placed the other end of gas
delivery tube into it.
5. Using a small blue flame gently heated the carbonate. Observed what
happened.
6. Removed gas tube from limewater before turning off the Bunsen burner.
7. Allowed to cool
8. Weighed the remaining Copper Carbonate.
9. Added approximately 5ml of Hydrochloric Acid to the solid residue (Copper
Oxide) from the decomposition reaction.
10. Transferred a small amount of original Copper Carbonate to new test tube
and added same amount of Hydrochloric Acid to that. Recorded observations.
Results: Observations from Decomposition: The limewater turned milky.
Observations from HCl & Copper Oxide: Small bubbles. Hardly a reaction.
Observations from HCl & Copper Carbonate: Bubbles & fizzing. Small amount
of heat generated. Turned milky green in colour. Reacted immeadiately.
Conclusion: The limewater proved that Carbon Dioxide was produced as a result of thedecomposition reaction.
The Copper Oxide test showed that theoretically there should be no reaction with HCl. Copper Carbonate, however, theoretically, should react.
Evaluation: Overall, the experiment was a success except for the fact that the HCl shouldn'thave reacted with the Copper Oxide but did. This is probably due to the fact there
was some Copper Carbonate still stuck to the side of the test tube and the HCl
reacted with that.
This compound is the copper(II) oxide, CuO.
Because it is easier. The molecular formula of copper carbonate is CuCO3. When it decomposes it loses a CO2 molecule. If it became Copper 1 oxide(Cu2O then it would have to combine with another molecule(releasing O). Instead it becames copper2 oxide(CuO) because that is an easier transition.
When copper carbonate is heated, it decomposes into copper oxide, releasing carbon dioxide gas. The remaining ionic compound is copper oxide (CuO).
When copper carbonate is heated, it changes from its green color to black copper oxide.
When copper carbonate is heated, it decomposes to form copper oxide and carbon dioxide gas, leaving behind copper oxide residue. When copper carbonate is mixed with acids to produce copper salts, a blue residue may be left behind.
Carbonate by itself is an ion that does not contain copper and therefore could not produce copper if heated. However, because carbonate is a negatively charged ion, no substantial number of carbonate ions can exist stably except in association with an equal number of positively charged cations to neutralize the electrical charge of the carbonate ions. If these cations are cations of copper, then copper oxide can be produced by heating the copper carbonate salt.
They form magnesium oxide, copper oxide etc. and will form carbon dioxide as a byproduct.
This compound is the copper(II) oxide, CuO.
Because it is easier. The molecular formula of copper carbonate is CuCO3. When it decomposes it loses a CO2 molecule. If it became Copper 1 oxide(Cu2O then it would have to combine with another molecule(releasing O). Instead it becames copper2 oxide(CuO) because that is an easier transition.
When copper carbonate is heated, it decomposes into copper oxide, releasing carbon dioxide gas. The remaining ionic compound is copper oxide (CuO).
When copper carbonate is heated, it changes from its green color to black copper oxide.
Here are the equations for the thermal decomposition of copper carbonate (notice that a metal oxide is formed, just as it was with calcium carbonate): Copper carbonate → copper oxide + carbon dioxide CuCO3 → CuO + CO2
Copper Carbonate when heated decomposes to give copper oxide and carbon dioxide.
When copper carbonate is heated, it decomposes to form copper oxide and carbon dioxide gas, leaving behind copper oxide residue. When copper carbonate is mixed with acids to produce copper salts, a blue residue may be left behind.
Copper (II) Carbonate
When copper(II) carbonate is heated, it decomposes to form copper(II) oxide and carbon dioxide. The ionic compound that remains is copper(II) oxide, which has the chemical formula CuO.
CuCO3 ==> CO2 + CuO (heat is the catalyst, written above the arrow)