Chemistry: Observation of Various Experiments

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Observation Exercise


Make and record observations, when various pairs of solids or solutions are mixed.


8 glass boiling tubes
Boiling tube rack
Polycarbonate glasses
Bunsen burner

Subtance List:

Sodium carbonate solution
Copper sulphate solution (Safety: High toxicity) Sodium hydroxide solution (Safety: Irritant) Ammonia solution (Safety: Toxic by inhalation) Potassium iodide solution (Safety: Mild irritant) Lead nitrate solution (Safety: Toxic)

Sulphuric acid (Safety: Corrosive) Copper carbonate
Silver Nitrate (Safety: Toxic, corrosive) Sodium chloride solution
Unknown salt solution


A lab coat and polycarbonate glasses will be worn at all times to protect against spillages and the chance of chemicals coming into contact with our eyes. After use of chemicals, they will be disposed of safely down the sink.


Substances (listed in table) were first observed prior to mixing, to ascertain their initial appearance. They were then combined (details of this combination in table) in glass boiling tubes and any initial changes to the resulting solution were recorded. Substances were then left to settle in the tube rack and changes were observed every few minutes. The results of the completed reactions were recorded.

For the final experiment a Bunsen burner was lit and the unknown salt solution was sprayed into the flame, any visual changes to the flame/ smells given off were recorded.

5 drops of sodium carbonate solution added to 1 cm3 of copper sulphate solution.. Copper sulphate solution a clear blue liquid. . Sodium carbonate solution a clear colourless liquid.
. When mixed get a milky blue precipitate.
. No odour.. Copper carbonate precipitate.
. Sodium sulphate in...
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