Chemistry - Tests (copy)

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Tests for anions, aqueous cations, gases and flame tests for metal ions

20 Terms

1

carbonate

test: add dilute acid

test result: effervescence, carbon dioxide produced

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2

chloride

test: acidify with dilute nitric acid, then add aqueous silver nitrate

test result: white ppt.

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3

bromide

test: acidify with dilute nitric acid, then add aqueous silver nitrate

test result: cream ppt.

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4

nitrate

test: add aqueous sodium hydroxide, them aluminium foil; warm carefully

test result: ammonia produced

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5

sulfate

test: acidify, then add aqueous barium nitrate

test result: white ppt.

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6

ammonium

effect of aqueous sodium hydroxide: ammonia produced in warming

effect of aqueous ammonia: -

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7

calcium

effect of aqueous sodium hydroxide: white ppt., insoluble in excess

effect of aqueous ammonia: no ppt. or very slightly white ppt.

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8

copper (II) - aqueous cation

effect of aqueous sodium hydroxide: light blue ppt., insoluble in excess

effect of aqueous ammonia: light blue ppt., soluble in excess, giving a dark blue solution

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9

iron (II)

effect of aqueous sodium hydroxide: green ppt., insoluble in excess

effect of aqueous ammonia: green ppt., insoluble in excess

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10

iron (III)

effect of aqueous sodium hydroxide: red-brown ppt., insoluble in excess

effect of aqueous ammonia: red-brown ppt., insoluble in excess

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11

zinc

effect of aqueous sodium hydroxide: white ppt., soluble in excess, giving a colourless solution

effect of aqueous ammonia: white ppt., soluble in excess, giving a colourless solution

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12

ammonia

test and test result: turns damp red litmus paper blue

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13

carbon dioxide

test and test result: turns limewater milky

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14

chlorine

test and test result: bleaches damp litmus paper

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15

hydrogen

test and test result: ‘pops’ with a lighted splint

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16

oxygen

relights a glowing splint

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17

lithium

red flame

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18

sodium

yellow flame

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19

potassium

lilac flame

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20

copper (II) - metal ion

blue-green flame

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