Last updated on Oct 23, 2026

The pH Scale & Neutralisation (OCR GCSE Chemistry A, Combined (Gateway Science Suite)): Flashcards

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The pH Scale & Neutralisation

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Ions produced by acids in aqueous solutions

Hydrogen ions ( $H^+$ )

Ions produced by bases in aqueous solutions

Hydroxide ions ( $OH^-$ )

Term for bases that are soluble in water

Alkalis

Range of the pH scale

0 to 14

pH value of neutral substances

7

pH range for acidic substances

0 to 6

pH range for alkaline substances

8 to 14

What pH is a logarithmic measure of

Concentration of $H^+$ ions

Chemical mixture that changes colour to show pH

Universal indicator

Universal indicator colour for neutral solution (pH 7)

Green

Reaction of acid & base forming salt & water

Neutralisation

General equation for neutralisation

$Acid + Base \rightarrow Salt + Water$

Product when $H^+$ and $OH^-$ ions react

Water ( $H_2O$ )

Type of compound formed from neutralisation

Salt (ionic compound)

Products of $HCl + NaOH$

$NaCl + H_2O$

Explore OCR GCSE Chemistry A, Combined (Gateway Science Suite) Revision Notes by Topics

Reactivity of Metals

Reactions of Acids

Electrolysis

Explore OCR GCSE Chemistry A, Combined (Gateway Science Suite) Model Answers by Topics

Reactivity of Metals

Reactions of Acids

Electrolysis

Explore OCR GCSE Chemistry A, Combined (Gateway Science Suite) Quizzes by Topics

Reactivity of Metals

Reactions of Acids

Electrolysis

Explore OCR GCSE Chemistry A, Combined (Gateway Science Suite) Exam Questions by Topics

Reactivity of Metals

Reactions of Acids

Electrolysis

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