substances

flame tests


Experiment 
                                                                                              Date

Flame Tests
Aim:

To observe the colours produced by some chemicals when they are placed in the Bunsen flame.

Materials:

Safety glasses and apron

Bunsen burner

Heat proof mat

Matches

Atomiser bottles containing 0.1 M solutions of the following chemicals:

copper sulfate

copper nitrate

strontium nitrate

potassium nitrate

calcium nitrate

sodium nitrate

Method:

1. Put on safety glasses and apron.

2. Set up the Bunsen burner on the heat proof mat.

3. Light Bunsen and adjust flame to 'blue flame'.

4. Gently spray the contents of the copper sulfate atomiser into the Bunsen flame.

5. Observe and record any colour change to the flame.

6. Repeat for the other solutions.

Results:

Solution

Flame colour

Copper sulfate

Blue-green

Copper nitrate

Blue-green

Strontium nitrate

Crimson

Potassium nitrate

Lilac

Calcium nitrate

Brick red

Sodium nitrate

Yellow

Conclusion:

 

Questions:

1.    Describe any difficulties experienced during the practical.

2.    Do you think that it is the metal part of the chemical substance or the other part that causes the colour change to the Bunsen flame? Explain.

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