Experiment 5 Ans

Experiment 5: Factors affecting Solubility. Results: Solute Copper (II) Sulphate Potassium chloride Calcium Carbonate Iron (II) nitrate

Observations Blue crystals dissolve to form a blue solution. ( 6 spatulas needed to form saturated solution ) White crystals dissolve to form a colourless solution (7 spatulas needed to form saturated solution ) White powder insoluble in water. ( 1 spatula ) Orange-brown crystals dissolve to form a yellowish brown solution. (3-4 spatulas needed to form saturated solution)

How can you tell if a solid has dissolved? No solid (solute) particles left/ seen. ............................................................................................................................................ Which of the solids investigated is most soluble in water? Potassium chloride ............................................................................................................................................ Which of the solids investigated is least soluble in water? Calcium carbonate ............................................................................................................................................ Do different solids dissolve equally in the same volume of water? No ............................................................................................................................................ Temperature of water 28.0 degrees celcius 65.0 degrees celcius

Observations Blue crystals dissolve to form a blue solution (>10 spatulas needed to reach saturation point) 15 spatulas needed to form saturated solution.

From the experiment, does the temperature of the solvent affect solubility? Explain your answer.

Yes. Higher temperature of solvent increase solubility of copper(II) sulphate crystals as shown by the results. At 28.0 degrees celcius you need 9-10 spatulas to reach saturated point but at 65.0 degrees celcius you need about 15 spatulas to reach saturated point.