Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
Solubility curves
19 practice questions
Practice questions
1–10 of 19
Question 1
1 mark · Easy
Answer and see the solution →State the equation used to calculate the solubility (in g per 100 g of water) from the mass of solute and mass of solvent.
Question 2
3 marks · Easy
Answer and see the solution →The table below shows the solubility of calcium nitrate at various temperatures.
Solubility of calcium nitrate at different temperatures Temperature /°C Solubility /g per 100 g water 10 129 30 136 50 145 70 151 90 156 (a)[2 marks]Draw a labelled solubility curve for calcium nitrate using the data.
(b)[1 mark]State the dependent variable on the graph.
Question 3
2 marks · Easy
Answer and see the solution →Use the solubility curve for potassium bromide (KBr) below to determine the solubility at 60°C.
Incomplete solubility curve for potassium bromide Question 4
2 marks · Easy
Answer and see the solution →Explain, using a solubility curve, how you would determine how much solid potassium sulfate would crystallise from a saturated solution as it cools from 70°C to 30°C.
Question 5
3 marks · Easy
Answer and see the solution →A student performed an experiment to measure the solubility of sodium nitrate. Her results are:
Experimental data for sodium nitrate solubility Mass of evaporating dish (g) Mass of dish + solution (g) Mass of dish + dry sodium nitrate (g) 22.00 60.00 32.50 (a)[1 mark]Calculate the mass of sodium nitrate dissolved in the solution.
(b)[1 mark]Calculate the mass of water in the solution.
(c)[1 mark]Calculate the solubility of sodium nitrate in g per 100 g of water.
Question 6
1 mark · Easy
Answer and see the solution →When plotting a solubility curve, on which axis should you put temperature?
Question 7
3 marks · Easy
Answer and see the solution →The solubility curve for barium chloride shows that its solubility is 37 g per 100 g water at 60°C, and 29 g per 100 g water at 30°C.
(a)[2 marks]How many grams of barium chloride will dissolve in 40 g of water at 60°C?
(b)[1 mark]What is the maximum temperature at which 10 g of barium chloride will just dissolve in 20 g of water?
Question 8
2 marks · Easy
Answer and see the solution →A solution contains 52 g of potassium iodide dissolved in 100 g of water at 60°C. The solubility curve for potassium iodide shows a solubility of 70 g per 100 g water at 60°C and 40 g per 100 g water at 30°C. Calculate the mass of potassium iodide that will crystallise out if the solution is cooled from 60°C to 30°C.
Question 9
2 marks · Normal
Answer and see the solution →A student mixes 8.0 g of a salt with 40.0 g of water at 30°C. After stirring, some solid remains undissolved. Use the solubility equation to calculate the solubility (in g per 100 g water) of the salt at 30°C for this experiment.
Question 10
4 marks · Normal
Answer and see the solution →The table below shows the solubility of lithium nitrate at different temperatures.
Solubility of lithium nitrate at various temperatures Temperature /°C Solubility /g per 100 g water 10 46.0 30 62.0 50 78.5 70 94.0 90 110.0 (a)[2 marks]Plot a solubility curve for lithium nitrate using the data in the table. Label both axes.
(b)[2 marks]Describe the shape of the solubility curve you draw.