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Science alternative to practical > test for anions, cations and gases > Flashcards

test for anions, cations and gases Flashcards

1
Q

Test for ammonia

A

turns damp red litmus paper blue

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2
Q

test for carbon dioxide

A

turns limewater milky

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3
Q

test for chlorine

A

bleaches damp litmus paper

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4
Q

test for hydrogen

A

‘pops’ with a lighted splint

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5
Q

test for oxygen

A

relights a glowing splint

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6
Q

test for carbonate (anions)

A

add dilute acid

- effervescence, carbon dioxide produced

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7
Q

test for chloride (anions)

A

acidify with dilute nitric acid, then add aqueous silver nitrate
- white ppt

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8
Q

test for iodide (anions)

A

acidify with dilute nitric acid, then add aqueous silver nitrate
- yellow ppt

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9
Q

test for nitrate (anions)

A

add aqueous sodium hydroxide, then aluminium foil; warm carefully
- ammonia produced

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10
Q

test for sulphate (anions)

A

acidify, then add aqueous barium nitrate

- white ppt

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11
Q

aluminium (cations) + aqueous sodium hydroxide

A

white ppt, soluble in excess giving a colourless solution

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12
Q

ammonium + aqueous sodium hydroxide

A

ammonia produced on warming

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13
Q

calcium + aqueous sodium hydroxide

A

white ppt, insoluble in excess

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14
Q

copper + aqueous sodium hydroxide

A

light blue ppt, insoluble in excess

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15
Q

Iron II + aqueous sodium hydroxide

A

Green ppt, insoluble in excess

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16
Q

Iron III + aqueous sodium hydroxide

A

Red-brown ppt, insoluble in excess

17
Q

Zinc + aqueous sodium hydroxide

A

White ppt, soluble in excess, giving a colourless solution

18
Q

aluminium + aqueous ammonia

A

white ppt, insoluble in excess

19
Q

calcium + aqueous ammonia

A

no ppt or very slight white ppt

20
Q

copper + aqueous ammonia

A

light blue ppt, soluble in excess, giving a dark blue solution

21
Q

Iron II + aqueous ammonia

A

green ppt, insoluble in excess

22
Q

Iron III + aqueous ammonia

A

Red-brown ppt, insoluble in excess

23
Q

Zinc + aqueous ammonia

A

white ppt, soluble in excess, giving a colourless solution

Science alternative to practical (3 decks)

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