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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.

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14y ago

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Related Questions

Does carbonate produce copper oxide when heated?

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.


What happens to magnesium carbonate copper carbonate zinc carbonate and calcium carbonate when they are heated?

They form magnesium oxide, copper oxide etc. and will form carbon dioxide as a byproduct.


What is the black solid formed when copper carbonate is heated?

This compound is the copper(II) oxide, CuO.


Why does copper carbonate decompose to make copper 2 oxide not copper 1 oxide?

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 what ionic compound remains?

When copper carbonate is heated, it decomposes into copper oxide, releasing carbon dioxide gas. The remaining ionic compound is copper oxide (CuO).


What is the color of copper carbonate when heated?

When copper carbonate is heated, it changes from its green color to black copper oxide.


Symbol equation when copper carbonate is heated?

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


What color is copper carbonate when heated?

Copper Carbonate when heated decomposes to give copper oxide and carbon dioxide.


What residue is left behind when copper carbonate is hot or cold?

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.


What is the name for CuO3?

Copper (II) Carbonate


What ionic compound remains when copper II carbonate is heated?

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.


Write a word equation to describe the decomposition of copper carbonate on heating?

CuCO3 ==> CO2 + CuO (heat is the catalyst, written above the arrow)