Cambridge IGCSE · Chemistry (0620)

Preparation of salts: Practice Questions

5 multiple-choice questions marked as you go, and 5 written questions with worked solutions. All on Preparation of salts.

10 questions27 marksFree, no account

Question 1

1 mark

Based on the general solubility rules for salts, which of the following groups contains only salts that are all soluble in water?

Question 2

1 mark

Which pair of aqueous solutions, when mixed together, will produce a precipitate of calcium sulfate, $CaSO_4$?

Question 3

1 mark

To prepare a pure sample of the insoluble salt lead(II) chloride, $PbCl_2$, which pair of aqueous solutions should be mixed together?

Question 4

1 mark

According to the general solubility rules, which of the following salts is insoluble in water?

Question 5

1 mark

Which of the following best defines a hydrated substance in the context of salt preparation?

Question 6

2 marks

Based on the general solubility rules for salts, state whether magnesium nitrate, $Mg(NO_3)_2$, is soluble or insoluble in water.

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Question 7

4 marks

Explain why excess copper(II) oxide is used when reacting it with dilute sulfuric acid to prepare a pure sample of copper(II) sulfate crystals.

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Question 8

5 marks

Write the ionic equation, including state symbols, for the preparation of the insoluble salt lead(II) chloride ($PbCl_2$) from aqueous ions.

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Question 9

5 marks

A student wants to prepare a pure, dry sample of the soluble salt magnesium sulfate by reacting an insoluble base with a suitable dilute acid.

(a) Name the insoluble base and the dilute acid the student should use for this preparation.
(b) Describe the experimental procedure to ensure that all the acid has reacted.
(c) After the reaction is complete, the mixture is filtered. Explain why filtration is necessary at this stage.
(d) Briefly outline how the student can obtain large, pure crystals of magnesium sulfate from the resulting filtrate.

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Question 10

6 marks

Barium sulfate ( $$ \text{BaSO}_4 $$ ) is an insoluble salt used in medical imaging. The general solubility rules indicate that sulfates are soluble, except for barium, calcium, and lead sulfates.

(a) State the names and formulae of two soluble compounds that could be reacted together to prepare barium sulfate by the precipitation method.

(b) Describe the method used to prepare a pure, dry sample of barium sulfate starting from the two aqueous solutions named in part (a).

(d) Write the ionic equation for the precipitation reaction.

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