Edexcel IGCSE Chemistry 复习笔记 1.1.5 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:

1. Prepare a two beakers, one as a hot water bath and one as an ice bath
2. Using a small measuring cylinder, measure out 4 cm³ of distilled water into a boiling tube.
3. On a balance weigh out 2.6 g of ammonium chloride and add it to the boiling tube
4. Place the boiling tube into the hot water bath and stir until the solid dissolves
5. Transfer the boiling tube to the ice bath and allow it to cool while stirring
6. Note the temperature at which crystals first appear and record it in a table of results
7. Add 1 cm³ of distilled water then warm the solution again to dissolve the crystals
8. Repeat the cooling process again noting the temperature at which crystals first appear.
9. 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:

Table of Results for Recording Solubility

Graph:

Use the results to plot a solubility curve for ammonium chloride at different temperatures. Solubility is on the y-axis and temperature is on the x-axisConclusion:The shape of the graph will allow to state how the solubility varies with temperature

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