Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
Measuring solubility [chemistry only]
18 practice questions
Practice questions
1–10 of 18
Question 1
1 mark · Easy
Answer and see the solution →Name one piece of laboratory equipment that can be used to remove undissolved solid from a saturated solution during a solubility experiment.
Question 2
3 marks · Easy
Answer and see the solution →State what is meant by the following terms.
(a)[1 mark]solvent
(b)[1 mark]solution
(c)[1 mark]saturated solution
Question 3
2 marks · Easy
Answer and see the solution →At 25°C, the solubility of potassium nitrate is 38 g per 100 g of water. Calculate the maximum mass of potassium nitrate that will dissolve in 250 g of water at this temperature. Show your working.
Question 4
2 marks · Easy
Answer and see the solution →Explain why it is important to heat the evaporating basin until its mass remains constant when measuring the solubility of a salt.
Question 5
1 mark · Easy
Answer and see the solution →State what is meant by a solution in chemistry.
Question 6
3 marks · Easy
Answer and see the solution →(a)The diagram below shows a solubility curve for a salt.
Solubility curve for salt W. (i)[1 mark]State the solubility of salt W at 20°C.
(ii)[1 mark]Describe what happens to the solubility of salt W as the temperature increases from 0°C to 60°C.
(iii)[1 mark]Explain, with reference to the solubility curve, how to tell when a solution of salt W at 40°C is saturated.
Question 7
2 marks · Easy
Answer and see the solution →A student found that 25.8 g of sodium chloride was obtained after evaporating all the water from a saturated solution made with 75 g of water at a certain temperature.
Calculate the solubility of sodium chloride in g per 100 g water at that temperature. Show your working.
Question 8
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 9
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 10
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.