AQA · Chemistry · 8462
GCSE Chemistry (AQA): Neutralisation Reactions
Topic 4 — Chemical Changes. Generated from the caption track of Cognito's lesson video "GCSE Chemistry - Neutralisation Reactions | Reactions of Acids (2027/28 exams)"; each card deep-links to the moment in the video it came from. Lesson 4.04 of Cognito's AQA GCSE Combined Science (Trilogy) and Chemistry course (Higher tier), filed under AQA Chemistry 8462. Teaching by Cognito — https://cognitoedu.org/coursesubtopic/c2-gcse-aqa-h-c_4.04.
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After crystals start forming, what causes even more crystals to appear?
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Stopping the heating and leaving the solution to cool.
How is excess insoluble base removed after making a soluble salt solution?
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By filtration, using filter paper and a filter funnel.
To make a soluble salt, an acid is reacted with an ? base such as a metal oxide, hydroxide or carbonate.
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insoluble
What are the products when an acid reacts with a metal oxide?
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A salt and water.
Which salt is formed when nitric acid reacts with calcium carbonate?
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Calcium nitrate, Ca(NO3)2 — two 1− nitrate ions balance the 2+ calcium ion.
Which part of the acid ends up in the salt formed during neutralisation?
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The negative ion (e.g. chloride, sulfate, nitrate), which combines with the positive ion from the base.
Which salt is formed when hydrochloric acid reacts with sodium oxide?
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Sodium chloride (NaCl) — plus water.
What are the three products of an acid reacting with a metal carbonate?
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A salt, water and carbon dioxide.
When making a soluble salt, how do you know the acid has all been neutralised?
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The insoluble base stops disappearing and sits in excess in the beaker.
Which salt is formed when sulfuric acid reacts with potassium hydroxide?
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Potassium sulfate, K2SO4, because each 2− sulfate ion needs two K+ ions.
Why use a water bath or electric heater, not a Bunsen burner, to crystallise a salt?
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To avoid heating the solution too strongly, which could damage (decompose) the salt.
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