Experiment on the Decomposition of a Carbonate

AIM: To carry kayoed a lab try out to analyse a carbonate using heat, also to carry out appropriate campaigns for the formation of products as a result of this decomposition.

DISSCUSION: Carbonates atomic number 18 decomposed by heat into the corresponding oxides and carbon dioxide. The temperature of decomposition dep terminals upon the occupation of the metal; that is to say, the more active the metal, the more stable is the carbonate. Thus, the carbonates of sodium and potassium are stable at the highest temperature of a bunsen burner flame, whereas the carbonates of silver and copper are easily decomposed. In this experiment copper (ii) carbonate will be decomposed at a high temperature, forming copper (ii) oxide and carbon dioxide:

CuCO3(s) arrow CuO(s) + CO2(g)

You will psychometric runnel for the formation of copper (ii) oxide and carbon dioxide.



Limewater is a sensitive test for CO2, forming a distinctive milky precipitate:

CO2(g) + Ca(OH)2(aq) arrow CaCO3(s) + H2O(l)

APPARUTUS:

* prolific Pyrex test tubes x 3

* medium Pyrex test tubes x 2

* holed fireplug x 1

* bent glass delivery tube x 1

* rubber tubing x 1

* glass tubing x 1

* retort stand x 2

* Bunsen burner x 1

* sentry duty glasses x 1

* Copper(ii) carbonate

* Limewater

* Copper(ii) oxide

* 5ml of dilute H2SO4

METHOD:

1) Transfer a miniscule quantity of CuCO3 equivalent to a depth of 1cm into a test tube

2) Clamp the test tube at an angle of 45 degrees and fit a stoppered delivery tube. Immerse the end of the delivery tube into a test tube half-filled with limewater as shown in the diagram.

3) Heat the test tube containing the CuCO3 strongly for a few minutes until a colour change in the carbonate and lime water is observed

4) Record...

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