Chemical analysis

Question 1

Flame tests can be used to identify what?

Answer 1

Metal ions

Question 2

What color flame do lithium (Li) compounds result in?

Answer 2

Crimson red

Question 3

What color flame do sodium (Na) compounds result in?

Answer 3

Yellow

Question 4

What color flame do potassium (K) compounds result in?

Answer 4

Purple

Question 5

What color flame do calcium (Ca) compounds result in?

Answer 5

Red

Question 6

What color flame do Barium (Ba) compounds result in?

Answer 6

Green

Question 7

Precipitate color - sodium hydroxide is reacted with Magnesium 2+

Answer 7

White

Question 8

Precipitate color - sodium hydroxide was reacted with Aluminum 3+

Answer 8

White - dissolves in

excess sodium hydroxide solution.

Question 9

Precipitate color - sodium hydroxide was reacted with Ca2+

Answer 9

White

Question 10

Precipitate color - sodium hydroxide was reacted with Cu2+

Answer 10

Blue

Question 11

Precipitate color - sodium hydroxide was reacted with Fe2+

Answer 11

Green

Question 12

Precipitate color - sodium hydroxide was reacted with Fe3+

Answer 12

Brown

Question 13

What happens when carbonates react with dilute acids?

Answer 13

Carbon dioxide formed.
Carbon dioxide produces a white precipitate
with limewater.
This turns limewater cloudy.

Question 14

What can be used to test for the presence of halide ions?

Answer 14

Silver nitrate solution + dilute nitric acid.

Question 15

What colour precipitate is silver chloride?

Answer 15

White

Question 16

What colour precipitate is silver bromide?

Answer 16

Cream

Question 17

What colour precipitate is silver iodide?

Answer 17

Yellow

Question 18

How to test for the presence of sulfate ions? (SO4 2-)

Answer 18

React the compound with barium chloride solution and dilute hydrochloric acid. A white precipitate will be formed.