AQA · Chemistry · 8462
GCSE Chemistry: Soluble salts
Chemical changes · AQA GCSE Chemistry (8462), specification point 4.4.2.3. Cards are generated from the exam board's own specification for "Soluble salts", and every card links back to the page it came from. Specification © AQA — used with attribution.
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What type of substance is reacted with an acid to make a soluble salt?
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A solid insoluble substance, such as a metal, metal oxide, metal hydroxide or metal carbonate.
Why is the insoluble solid added to the acid until no more reacts?
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So that all the acid is used up (the solid is in excess), leaving a salt solution with no acid left over.
Excess unreacted solid is removed from a salt solution by ?.
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filtration
How is a solid salt obtained from a salt solution?
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By crystallisation – evaporating the water so that solid salt crystals form.
Salt solutions can be ? to produce solid salts.
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crystallised
What is the first step in making a soluble salt from an acid and an insoluble solid?
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Add the solid to the acid until no more reacts (so the solid is in excess).
What is prepared in AQA GCSE Chemistry Required Practical 1?
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A pure, dry sample of a soluble salt from an insoluble oxide or carbonate.
In the soluble salt practical, what is the Bunsen burner used to heat?
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The dilute acid, before the insoluble oxide or carbonate is added.
Why is the dilute acid heated before adding the insoluble oxide or carbonate?
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To speed up the reaction between the acid and the solid.
Which apparatus is used to evaporate the salt solution in the soluble salt practical?
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A water bath or an electric heater.
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