Chemical Test Flashcards by Alice Lowe

Alcohol test

Add: PCl5
Observe: misty white fumes (HCl)

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Alcohol test equation
(Ethanol)

C2H5OH + PCl5 -> C2H5Cl + POCl3 +HCl

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Alkene

Decolourises bromine water

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Alkene test equation

C2H4 + Br2 -> C2H4Br2

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Aldehyde test

Add: Benedicts and heat
Observe: blue -> brick red

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Aldehyde test equation (ethanal)

CH3CHO + [o] -> CH3COOH

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Strontium test

Red flame

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Sodium test

Yellow flame

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Potassium test

Lilac

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Lithium test

Red

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Copper test

Blue/green flame

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Barium test

Apple green flame

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Calcium test

Brick red flame

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NH4+ test

Tunes damp red litmus blue (from NH3)

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Cl- test

Dilute nitric acid and silver nitrate
(HNO3 + AgNO3)
White ppt
Soluble in dilute NH3

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Br- test

Dilute nitric acid and silver nitrate
(HNO3 + AgNO3)
Cream ppt
Dissolves in conc NH3

I- test

Dilute nitric acid and silver nitrate
(HNO3+AgNO3)
Yellow precipitate
Insoluble in NH3

Sulphate

Add BaCl2 and HCl
White precipitate (BaSO4)
Ba2+ + SO4 2- -> BaSO4 (s)

Carbonate test

Add acid and bubble through lime water
Fishes and turns lime water cloudy (CO2)
Ca(OH)2 + CO2 -> CaCO3 + H2O