Last updated on Oct 23, 2026

Identifying Ions (AQA A-Level Chemistry): Quizzes

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Identifying Ions

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What is observed when excess NaOH is added to $Ba²⁺$ ions?

Colourless solution

What happens when excess $H₂SO₄$ is added to $Mg²⁺$ ions?

Colourless solution forms

What colour change occurs when testing for $NH₄⁺$ ions with damp red litmus paper?

Turns blue

What observation confirms the presence of carbonate ions when $CO₂$ is produced?

Limewater turns cloudy

What fumes are observed when concentrated $H₂SO₄$ is added to solid KBr?

Orange fumes

Which reagents are used to test for sulfate ions in aqueous solution?

$BaCl₂$ and dilute HCl

What happens to the white precipitate from KCl and $AgNO₃$ when dilute ammonia is added?

Dissolves to colourless solution

What colour precipitate forms when $AgNO₃$ is added to KI solution?

Yellow precipitate

What is observed when excess $H₂SO₄$ is added to $Sr²⁺$ ions?

White precipitate remains

What is observed when excess NaOH is added to $Ca²⁺$ ions?

Slight white precipitate

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