What is the chemical test for carbonate (CO3 2-) ions?
Add dilute nitric acid, HNO3.
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What will be observed?
Effervescence, as carbon dioxide is evolved.
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What is the chemical test for sulphate (SO4 2-) ions?
Add Ba 2+ ions.
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What will be observed?
White precipitate of BaSO4 is formed.
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What is the chemical test for halide (Cl -, Br -, I -) ions?
Add Ag + ions.
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What will be observed?
Cl- - white precipitate of AgCl, soluble in dilute NH3; Br- - cream precipitate of AgBr, soluble in concentrated NH3; I- - yellow precipitate of AgI, soluble in concentrated NH3.
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What is the chemical test for ammonium (NH4 +) ions?
Add sodium hydroxide, NaOH, and heat gently.
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What is observed?
Effervescence, as ammonia gas is evolved; damp, red indicator paper will turn blue.
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What is the chemical test for transition metal ions?
Add sodium hydroxide and ammonia to form a precipitate.
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What is observed if Cu 2+ ions are present?
Blue solution reacts to form a blue precipitate of copper (II) hydroxide; the precipitate is insoluble in excess sodium hydroxide.
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What is observed if Fe 2+ ions are present?
Pale green solution reacts to form a green precipitate of iron (II) hydroxide; the precipitate is insoluble in excess sodium hydroxide; turns brown at surface in air as iron(II) is oxidised to iron(III).
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What is observed if Fe 3+ ions are present?
Pale yellow solution reacts to form an orange-brown preciitateof iron (III) hydroxide; insoluble in excess sodium hydroxide.
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What is observed if Mn 2+ ions are present?
Pale pink solution reacts to form a light brown precipitate of manganese (II) hydroxide which darkens on standing in air; insoluble in excess sodium hydroxide.
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What is observed if Cr 3+ ions are present?
Voilet solution reacts to form a grey-green precipitate of chromium (III) hydroxide; soluble in excess sodium hydroxide forming a dark-green solution.
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Other cards in this set
Card 2
Front
What will be observed?
Back
Effervescence, as carbon dioxide is evolved.
Card 3
Front
What is the chemical test for sulphate (SO4 2-) ions?
Back
Card 4
Front
What will be observed?
Back
Card 5
Front
What is the chemical test for halide (Cl -, Br -, I -) ions?
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