IGCSE Chemistry: Tests and gas tests for anions

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ammonia (NH3)

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1

ammonia (NH3)

turns damp, red litmus paper blue

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2

carbon dioxide (CO2)

Turns limewater milky

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3

Chlorine (Cl2) gas

bleaches damp litmus paper

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4

hydrogen (H2)

'pops' with a lighted splint

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5

oxygen (O2)

Relights a glowing splint

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6

Sulfur Dioxide (SO2)

turns acidified aqueous potassium manganate(VII) from purple to colourless

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7

carbonate (CO3 2-) - add dilute acid

effervescence, carbon dioxide produced

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8

chloride (Cl-) - acidify with dilute nitric acid, then add aqueous silver nitrate

white ppt.

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9

bromide (Br-) - acidify with dilute nitric acid, then add aqueuous silver nitrate

cream ppt.

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10

iodide (I-) - acidify with dilute nitric acid, then add aqueuous silver nitrate

yellow ppt.

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11

nitrate (NO3-) - add aqueous sodium hydroxide, then aluminium foil; warm carefully

ammonia produced

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12

sulfate (SO4 2-) - acidify, then add aqeuous barium nitrate

white ppt.

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13

sulfite (SO3 2-) - add dilute hydrochloric acid, warm grently and test for the presence of sulfur dioxide

sulfur dioxide produced will turn acidified aqeuous potassium manganate(VII) from purple to colourless

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