Acids and alkalis (Edexcel GCSE Chemistry Combined Science): Flashcards

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Acids and alkalis
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pH of acids

Less than 7

Ions formed by acids in water

H+H⁺ ions (hydrogen ions)

Higher H+H⁺ concentration → effect on pH

Lower pH

pH of alkalis

Greater than 7

Ions formed by alkalis in water

OH−OH⁻ ions (hydroxide ions)

Definition of an alkali

A base that is soluble in water

Acid + base → products?

Salt and water

Purpose of indicators

Test if solution is acidic, neutral, or alkaline

Litmus colour in acid

Red

Litmus colour in alkali

Blue

Phenolphthalein colour in alkali

Pink

pH of a neutral solution

7

What do H+H⁺ and OH−OH⁻ form in neutralisation?

Water (H2OH₂O)

Explore Edexcel GCSE Chemistry Combined Science Revision Notes by Topics

Acids and alkalis

Investigating neutralisation reactions

Strong & Weak Acids

Reactions of acids

Making insoluble salts

Making soluble salts

Explore Edexcel GCSE Chemistry Combined Science Model Answers by Topics

Acids and alkalis

Investigating neutralisation reactions

Strong & Weak Acids

Reactions of acids

Making insoluble salts

Making soluble salts

Explore Edexcel GCSE Chemistry Combined Science Quizzes by Topics

Acids and alkalis

Investigating neutralisation reactions

Strong & Weak Acids

Reactions of acids

Making insoluble salts

Making soluble salts

Explore Edexcel GCSE Chemistry Combined Science Exam Questions by Topics

Acids and alkalis

Investigating neutralisation reactions

Strong & Weak Acids

Reactions of acids

Making insoluble salts

Making soluble salts

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