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Flashcards in Tests Deck (21):
0

Hydrogen gas

Mix with air
Ignite
Burns with a squeaky pop

1

Oxygen gas

Relights a glowing splint

2

Carbon dioxide gas

Bubble through limewater (acid and carbonate)
Turns limewater milky

3

Chlorine gas

Damp litmus paper turns white
Moist starch-iodide paper turns blue

4

Ammonia gas

Heat up with sodium hydroxide in a boiling tube
Damp red litmus paper turns blue
Damp universal indicator paper turns purple

5

Carbonate ions using dilute acid

To the solid or an aqueous solution of it
Add dilute hydrochloric/ nitric acid
Bubbles of gas are formed
The gas formed turns limewater milky

6

Surface ions by precipitation with barium chloride solution

To an aqueous solution of the solid under test
Add dilute hydrochloric acid followed by a few drops of barium chloride
White precipitate of barium sulfate formed

7

Halide ions by precipitation with silver nitrate solution (anion)

Aqueous solution of the solid under test
add some dilute nitric followed by a few drops of silver nitrate solution

8

Chloride ion (precipitate test)

White precipitate
(Silver chloride)

9

Bromide ion (precipitate test)

Cream precipitate
(Sliver bromide)

10

Iodide ion (precipitate test)

Yellow precipitate
(Silver iodide)

11

Metal cations

Metal cations
Most metal cations are insoluble, can be precipitated by adding sodium hydroxide

12

Copper (ii) (precipitate)

Blue precipitate

13

Iron (ii) (precipitate)

Green precipitate

14

Iron (iii) (precipitate)

Brown precipitate

15

Flame test

Metal cations
Platinum or inch nichrome wire dipped into hydrochloric acid (put into Bunsen burner first until has no colour) repeat
then into the solid sample

16

Lithium (flame test)

Red

17

Potassium (flame test)

Lilac

18

Calcium (flame test)

Brick red

19

Sodium (flame test)

Yellow/ orange

20

Ammonium ion

Add aqueous sodium hydroxide to the solid
Warm the mixture

Ammonium ions presents -> pungent smelling gas produced
Damp red litmus paper goes blue