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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7.2 Preparation of Salts
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
Which statement is correct?
Anhydrous copper sulfate will decrease in mass on gentle warming
Water of crystallisation is the number of water molecules present in hydrated crystals
All soluble salts contain water of crystallisation
Hydrated copper(II) sulfate has the formula CuSO4.2H2O
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41 mark
Which method(s) of salt preparation could be used to prepare a sample of magnesium chloride?
1 Titration
2 Reaction of an acid with excess metal
3 Reaction of an acid with excess insoluble base
1 and 2 only
1 and 3 only
2 and 3 only
1 only
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51 mark
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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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
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
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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51 mark
Samples of two solids, P & Q, are separately dissolved in water and made into solutions.
Which combination of P & Q solutions, would give an insoluble product on mixing?
| P | Q | |
| A | potassium chloride | sodium hydroxide |
| B | ammonium chloride | potassium sulfate |
| C | sodium nitrate | magnesium sulfate |
| D | barium chloride | sodium sulfate |
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