Practical: Investigate The Solubility of a Solid In Water at a Specific Temperature (Edexcel IGCSE Chemistry (Modular))
Revision Note
Practical: Investigate the solubility of a solid in water at a specific temperature
Aim
To measure the solubility of a salt at different temperatures
Method
Prepare two beakers, one as a hot water bath and one as an ice bath
Using a small measuring cylinder, measure out 4 cm3 of distilled water into a boiling tube.
On a balance weigh out 2.6 g of ammonium chloride and add it to the boiling tube
Place the boiling tube into the hot water bath and stir until the solid dissolves
Transfer the boiling tube to the ice bath and allow it to cool while stirring
Note the temperature at which crystals first appear and record it in a table of results
Add 1 cm3 of distilled water then warm the solution again to dissolve the crystals
Repeat the cooling process again noting the temperature at which crystals first appear
Continue the steps until a total of 10 cm3 of water has been added
Apparatus for investigating the solubility of a salt with temperature
Results
The results for method 2 can be recorded in a table
The solubility in g / 100g is calculated by dividing the mass of the solute by the volume and multiplying by 100
Example results table
Volume of water in boiling tube / cm3 | Solubility in g per 100 g | Temperature at which crystals appear / oC |
---|---|---|
4 | 65 |
|
5 | 52 |
|
6 | 43 |
|
7 | 37 |
|
8 | 32 |
|
9 | 29 |
|
10 | 26 |
|
Graph
The results can be used to plot a solubility curve for ammonium chloride at different temperatures
Solubility is on the y-axis and temperature is on the x-axis
Conclusion
The shape of the graph will allow us to state how the solubility varies with temperature
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