Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
Measuring solubility [chemistry only]
18 practice questions
Practice questions
1–8 of 8 · Normal
Question 1
2 marks · Normal
Answer and see the solution →State the meaning of the following terms as used in chemistry:
(a)[1 mark]solute
(b)[1 mark]solvent
Question 2
4 marks · Normal
Answer and see the solution →The graph below shows the solubility of two different salts (potassium nitrate and sodium chloride) in water as the temperature increases.
(a)[1 mark]Using the graph, estimate the solubility of potassium nitrate in water at 30°C.
(b)[1 mark]State which salt is more soluble at 0°C. Justify your answer using data from the graph.
(c)[2 marks]Explain what is meant by a 'solubility curve'.
Question 3
3 marks · Normal
Answer and see the solution →A student wants to find the solubility of copper(II) sulfate in water at 30°C. She carries out the following experiment:
1. Weighs an empty evaporating basin: 28.60 g 2. Adds a known mass of saturated copper(II) sulfate solution at 30°C to the basin: total mass 62.10 g 3. Evaporates all the water. The mass of evaporating basin plus copper(II) sulfate crystals after heating is 36.10 g
Calculate the solubility of copper(II) sulfate in water at 30°C in g per 100 g water, giving your answer to 2 significant figures.
Question 4
1 mark · Normal
Answer and check →Which precaution should be taken to ensure an accurate measurement of solubility during the experiment to find the solubility of a salt in water?
- A.Use cold tap water to dissolve the salt
- B.Pour undissolved solid into the evaporating basin with the solution
- C.Weigh the evaporating basin before and after adding the solution
- D.Include some dry solid in the final weighing
Question 5
2 marks · Normal
Answer and see the solution →State the meaning of the following:
(a)[1 mark]solution
(b)[1 mark]saturated solution
Question 6
4 marks · Normal
Answer and see the solution →The graph below shows the solubility curves of two substances, ammonium chloride and sodium chloride, in water.
(a)[2 marks]Compare how the solubility of ammonium chloride and sodium chloride changes as temperature increases.
(b)[1 mark]Estimate the solubility of ammonium chloride at 50°C using the graph.
(c)[1 mark]Which substance is more soluble at 0°C?
Question 7
3 marks · Normal
Answer and see the solution →The following terms are commonly used in describing solutions:
(a)Define the following terms:
(i) solvent
(ii) solute
(iii) saturated solution
(i)[1 mark]solvent
(ii)[1 mark]solute
(iii)[1 mark]saturated solution
Question 8
4 marks · Normal
Answer and see the solution →The table below shows the solubility of two salts in water at different temperatures.
Solubility data for Salt X and Salt Y in water Temperature (°C) Solubility of Salt X (g/100g water) Solubility of Salt Y (g/100g water) 20 32 13 40 44 19 60 56 25 80 68 31 (a)[4 marks]On the axes below, plot the solubility curves for Salt X and Salt Y using the data from the table.
Use a suitable scale and label both curves clearly.