Last updated on Sep 20, 2026

Posiitve ions - Metal Hydroxides (Edexcel GCSE Chemistry): Flashcards

📚Flashcards

Revision Notes Model Answers Quizzes Flashcards Exam Questions

8.3.2 Metal Hydroxides

Practise the cards

13 cards from this deck

Show

Reagent used to identify metal ions

Sodium hydroxide (NaOH)

What do metal ions form with $OH^-$ ?

Insoluble metal hydroxide precipitates

$Ca^{2+}$ + NaOH precipitate colour

White

$Mg^{2+}$ + NaOH precipitate colour

White

$Al^{3+}$ + NaOH precipitate colour

White

$Al(OH)_3$ in excess NaOH

Dissolves to form colourless solution

$Cu^{2+}$ + NaOH precipitate colour

Blue

$Fe^{2+}$ + NaOH precipitate colour

Green

$Fe^{3+}$ + NaOH precipitate colour

Brown

How to identify metal ions with NaOH

By colour of precipitate formed

Metal hydroxide that dissolves in excess NaOH

Aluminium hydroxide

Name of $Ca^{2+}$ precipitate

Calcium hydroxide

Name of $Cu^{2+}$ precipitate

Copper hydroxide

Join 100,000+ GCSE students studying Flashcards with us.

Select your subjects, and get access to A+ resources today.

Posiitve ions - Metal Hydroxides (Edexcel GCSE Chemistry): Flashcards

Practise the cards

Reagent used to identify metal ions

What do metal ions form with OH−OH^-OH−?

Ca2+Ca^{2+}Ca2+ + NaOH precipitate colour

Mg2+Mg^{2+}Mg2+ + NaOH precipitate colour

Al3+Al^{3+}Al3+ + NaOH precipitate colour

Al(OH)3Al(OH)_3Al(OH)3​ in excess NaOH

Cu2+Cu^{2+}Cu2+ + NaOH precipitate colour

Fe2+Fe^{2+}Fe2+ + NaOH precipitate colour

Fe3+Fe^{3+}Fe3+ + NaOH precipitate colour

How to identify metal ions with NaOH

Metal hydroxide that dissolves in excess NaOH

Name of Ca2+Ca^{2+}Ca2+ precipitate

Name of Cu2+Cu^{2+}Cu2+ precipitate

Explore Edexcel GCSE Chemistry Revision Notes by Topics

Separating mixtures

Identifying gases

Water

Positive ions - Flame Tests

Posiitve ions - Metal Hydroxides

Identifying negative ions - Carbonates test

Negative ions- Sulphate test

Negative ion- Halide Test

Tests for cations

Tests for anions

Flame photometry

Homologous series:

Alkanes

Alkenes

Addition polymers

Condensation polymers

Tests for cations

Tests for anions

Flame photometry

Homologous series:

Alkanes

Alkenes

Addition polymers

Condensation polymers

Disposing of polymers

Alcohols

Carboxylic acids

Production of ethanol

Combustion of alcohols

Nanoparticles

Types of materials and their uses

Explore Edexcel GCSE Chemistry Model Answers by Topics

Separating mixtures

Identifying gases

Water

Positive ions - Flame Tests

Posiitve ions - Metal Hydroxides

Identifying negative ions - Carbonates test

Negative ions- Sulphate test

Negative ion- Halide Test

Tests for cations

Tests for anions

Flame photometry

Homologous series:

Alkanes

Alkenes

Addition polymers

Condensation polymers

Tests for cations

Tests for anions

Flame photometry

Homologous series:

Alkanes

Alkenes

Addition polymers

Condensation polymers

Disposing of polymers

Alcohols

Carboxylic acids

Production of ethanol

Combustion of alcohols

Nanoparticles

Types of materials and their uses

Explore Edexcel GCSE Chemistry Quizzes by Topics

What do metal ions form with $OH^-$ ?

$Ca^{2+}$ + NaOH precipitate colour

$Mg^{2+}$ + NaOH precipitate colour

$Al^{3+}$ + NaOH precipitate colour

$Al(OH)_3$ in excess NaOH

$Cu^{2+}$ + NaOH precipitate colour

$Fe^{2+}$ + NaOH precipitate colour

$Fe^{3+}$ + NaOH precipitate colour

Name of $Ca^{2+}$ precipitate

Name of $Cu^{2+}$ precipitate