11 mark
When solid sodium chloride is mixed with water, sodium chloride solution forms.
What name is given to the process of mixing a solid with water to form a solution?
| A | Crystallising |
| B | Diluting |
| C | Dissolving |
| D | Melting |
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Preparation of Salts (CIE IGCSE Chemistry: Co-ordinated Sciences (Double Award))
Exam Questions
3 hours37 questions21 mark
Different salts can be prepared by titrating an alkali with an aqueous acid.
Three pieces of apparatus, P, Q and R, used to measure volumes of liquid are shown below.
What are the names of the three pieces of apparatus, P, Q and R?
| P | Q | R | |
| A | pipette | burette | measuring cylinder |
| B | burette | pipette | conical flask |
| C | pipette | volumetric flask | burette |
| D | burette | pipette | measuring cylinder |
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31 mark
A student making copper sulfate crystals used the method shown.
Unreacted copper carbonate was left over as it had been added in excess.
What is the reason for adding it in excess and what would step 3 be of this method?
| reason for adding in excess | step 3 | |
| A | to produce a greater amount of salt crystals | filtration |
| B | to improve the colour intensity of the crystals | crystallisation |
| C | to ensure all the acid reacts | filtration |
| D | to increase the rate of reaction | evaporation |
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41 mark
When an aqueous salt is crystallised, some water can be retained within the structure of the salt.
What is the name given to the type of salt that forms?
| A | anhydrous salt |
| B | dehydrated salt |
| C | hydrated salt |
| D | soluble salt |
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11 mark
A student wanted to prepare copper(II) sulfate crystals by reacting solid copper(II) oxide to a solution of hot sulfuric acid.
An extract from the method section of the experimental handout is shown below:
Add the copper(II) oxide in small amounts to the hot acid in the reaction flask and stir until it is …..1…... When the reaction has gone to completion the copper(II) oxide will no longer …..2……, …..3….. and …..4….. the solution to obtain the copper(II) sulfate crystals.
| 1 | 2 | 3 | 4 | |
| A | in excess | precipitate | cool | dissolve |
| B | in excess | dissolve | filter | cool |
| C | reacting | dissolve | cool | filter |
| D | reacting | precipitate | filter | cool |
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21 mark
Extended tier only
Which of the following methods to prepare a salt can be achieved using a burette and a pipette?
Nitric acid and calcium carbonate to prepare calcium nitrate.
Sulfuric acid and copper(II) oxide to prepare copper(II) sulfate.
Hydrochloric acid and zinc to prepare zinc chloride.
Hydrochloric acid and potassium hydroxide to prepare potassium chloride.
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31 mark
Copper(II) sulfate can be prepared by reacting solid copper(II) carbonate with hot sulfuric acid. The alkali solid is always added in excess.
Why is the solid reactant added in excess?
To ensure all of the acid reacts.
To make the reaction go faster.
To ensure all of the solid reactant has reacted.
To increase the product yield.
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41 mark
Extended tier only
What is the correct sequence of steps for the preparation of a pure sample of lead(II) iodide from solid potassium iodide and lead(II) nitrate ?
Mixing → Dissolving → Filtration → Rinsing with distilled water → Drying
Rinsing with distilled water → Dissolving → Mixing → Filtration → Drying
Dissolving → Mixing → Filtration → Rinsing with distilled water → Drying
Dissolving → Filtration → Mixing → Rinsing with distilled water → Drying
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11 mark
A student is provided with solutions of dilute hydrochloric acid, dilute sulfuric acid, solid magnesium oxide, zinc carbonate and copper.
How many different salts could the student make?
2
3
4
6
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21 mark
A substance reacts with dilute H2SO4 to form a salt which is separated by filtration.
What is the substance?
Aqueous sodium hydroxide
Aqueous barium chloride
Copper
Copper(II) carbonate
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31 mark
Extended tier only
Silver chloride can be prepared by the reaction of silver nitrate solution with potassium chloride solution.
Which statement about the preparation is correct?
To get the maximum yield of product you need to have excess silver nitrate
To get the maximum yield of product you need to have excess potassium chloride
Equal volumes of the two solutions should be used
Equal concentrations of the two solutions should be used
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