Core practical - Salt preparation (AQA GCSE Chemistry): Flashcards

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Core practical - Salt preparation
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Definition of a salt (chemistry)

Compound formed from reaction between an acid and a base

General equation: acids + bases produce

Salts + water

Aim of copper sulfate practical

Prepare pure, dry sample of copper sulfate crystals

Safety equipment needed for acid work

Eye protection

Reason for heating the sulfuric acid

Makes the reaction happen faster

Substance added to sulfuric acid

Black copper oxide powder

Why add excess copper oxide?

To ensure all the acid has reacted

Method to remove excess copper oxide

Filter using filter paper and funnel

CuO+H2SO4\text{CuO} + \text{H}_2\text{SO}_4 produces

CuSO4+H2O\text{CuSO}_4 + \text{H}_2\text{O} (copper sulfate + water)

Result of water evaporating from CuSO4\text{CuSO}_4 solution

Blue copper sulfate crystals

Salt type from sulfuric acid

Sulfates

Salt type from hydrochloric acid

Chlorides

Salt type from nitric acid

Nitrates

Colour change: copper oxide to copper sulfate solution

Black to blue

Effect of slow evaporation on crystals

Larger, purer crystals form

Explore AQA GCSE Chemistry Revision Notes by Topics

Reactivity of Metals

Reactions of Acids

Electrolysis

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Reactivity of Metals

Reactions of Acids

Electrolysis

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Reactivity of Metals

Reactions of Acids

Electrolysis

Explore AQA GCSE Chemistry Exam Questions by Topics

Reactivity of Metals

Reactions of Acids

Electrolysis

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