Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
Measuring solubility [chemistry only]
18 practice questions
Practice questions
11–18 of 18
Question 11
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 12
2 marks · Normal
Answer and see the solution →State the meaning of the following:
(a)[1 mark]solution
(b)[1 mark]saturated solution
Question 13
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 14
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 15
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.
Question 16
2 marks · Hard
Answer and see the solution →State the difference between a solution and a saturated solution, as used in chemistry.
Question 17
5 marks · Hard
Answer and see the solution →The solubility curves below show the solubility of salt X and salt Y in water at different temperatures.
Solubility of Salts X and Y in Water (a)[1 mark]State which salt is more soluble in water at 30°C.
(b)[1 mark]Calculate the difference in solubility between salt X and salt Y at 60°C.
(c)[2 marks]Describe how the solubility of each salt changes as the temperature increases from 10°C to 70°C.
(d)[1 mark]Explain why it is important to use the same amount of water when measuring the solubility of different salts.
Question 18
2 marks · Hard
Answer and see the solution →Describe one safety precaution and one step to ensure accuracy when carrying out a solubility experiment for a solid in water.