Topic 0- Fire Flashcards Preview

IGSCE Chemistry- Part 1 > Topic 0- Fire > Flashcards

Flashcards in Topic 0- Fire Deck (11)
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1

what are the colours for lithium, potassium, calcium and sodium from the flame test?

lithium: red
potassium: lilac
calcium: brick red
sodium: yellow/orange

2

how do you test for ammonium ions?

add aqueous sodium to the solid, or solution, under test and warm the mixture. If ammonium ions are present then a pungent-smelling gas is produced. The gas produces turns damp red litmus paper to blue.

3

how do you test for metal cations?

add sodium hydroxide solution and the metals should change colour.
copper (II)- blue
iron (II)- green
iron (III)- brown

4

how do you test for the anions: chloride, bromide and iodide?

add some dilute nitric acid followed by a few drops of silver nitrate solution:
- chloride ion: white precipitate
- bromide ion: cream precipitate
- iodide ion: yellow preciptate

5

how do you test for sulfate ions?

add dilute hydrochloric acid followed by a few drops of barium chloride solution with the sulfate ions.
Result: white precipitate (of barium sulfate)

6

how do you test for carbonate ions?

to either the solid, or an aqueous solution of the solid, under test add dilute hydrochloric (or nitric) acid
Result: bubbles of carbon dioxide gas. Test: will turn limewater milky

7

what is the test for hydrogen?

mix with air and ignite = squeaky pop

8

what is the test for oxygen?

inset glowing splint= splint relights

9

what is the test for carbon dioxide?

bubble through limewater= limewater turns milky

10

what is the test for ammonia?

damp red litmus paper= turns blue

11

what is the test for chlorine?

damp red litmus paper= turns white