Last updated on Oct 23, 2026

Identifying Ions (AQA A-Level Chemistry): Flashcards

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Identifying Ions

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Result when $Ba²⁺$ reacts with excess $NaOH$

No precipitate/colourless solution

Result when $Mg²⁺$ reacts with excess $H₂SO₄$

Colourless solution (soluble $MgSO₄$ )

Test for $NH₄⁺$ : damp red litmus paper turns?

Blue (ammonia gas released)

Test for $CO₃²⁻$ : what happens to limewater?

Turns cloudy

Reagent to test for $SO₄²⁻$ ions

$BaCl₂$ and dilute $HCl$

Colour of ppt when $Cl⁻$ reacts with $AgNO₃$

White precipitate

Colour of ppt when $Br⁻$ reacts with $AgNO₃$

Cream precipitate

Colour of ppt when $I⁻$ reacts with $AgNO₃$

Yellow precipitate

Fumes when solid $KI$ reacts with conc. $H₂SO₄$

Purple fumes and purple/black solid

Why add dilute $HCl$ before testing for $SO₄²⁻$ ?

Removes carbonate ions (avoid false positive)

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Identifying Ions (AQA A-Level Chemistry): Flashcards

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Result when Ba2+Ba²⁺Ba2+ reacts with excess NaOHNaOHNaOH

Result when Mg2+Mg²⁺Mg2+ reacts with excess H2SO4H₂SO₄H2​SO4​

Test for NH4+NH₄⁺NH4+​: damp red litmus paper turns?

Test for CO32−CO₃²⁻CO32−​: what happens to limewater?

Reagent to test for SO42−SO₄²⁻SO42−​ ions

Colour of ppt when Cl−Cl⁻Cl− reacts with AgNO3AgNO₃AgNO3​

Colour of ppt when Br−Br⁻Br− reacts with AgNO3AgNO₃AgNO3​

Colour of ppt when I−I⁻I− reacts with AgNO3AgNO₃AgNO3​

Fumes when solid KIKIKI reacts with conc. H2SO4H₂SO₄H2​SO4​

Why add dilute HClHClHCl before testing for SO42−SO₄²⁻SO42−​?

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Result when $Ba²⁺$ reacts with excess $NaOH$

Result when $Mg²⁺$ reacts with excess $H₂SO₄$

Test for $NH₄⁺$ : damp red litmus paper turns?

Test for $CO₃²⁻$ : what happens to limewater?

Reagent to test for $SO₄²⁻$ ions

Colour of ppt when $Cl⁻$ reacts with $AgNO₃$

Colour of ppt when $Br⁻$ reacts with $AgNO₃$

Colour of ppt when $I⁻$ reacts with $AgNO₃$

Fumes when solid $KI$ reacts with conc. $H₂SO₄$

Why add dilute $HCl$ before testing for $SO₄²⁻$ ?