C3: Tests For Positive Ions

Question 0

What colour does lithium turn in a flame?

Answer 0

Bright red

Question 1

What are the two ways to test for positive ions?

Answer 1

Flame test

Sodium hydroxide

Question 2

What colour does sodium turn in a flame?

Answer 2

Golden yellow

Question 3

What colour does potassium turn in a flame?

Answer 3

Lilac

Question 4

What colour does calcium turn in a flame?

Answer 4

Brick red

Question 5

What colour does barium turn in a flame?

Answer 5

Green

Question 6

What groups does the flame test work for?

Answer 6

Groups 1&2

Question 7

What is the platinum wire dipped in before it’s covered in the substance and put under the flame?

Answer 7

Hydrochloride acid

Question 8

What three ions produce a white precipitate?

Answer 8

Aluminium
Calcium
Magnesium

Question 9

If there is a white precipitate, which was made by adding sodium hydroxide, and MORE sodium hydroxide is added, what metal ion dissolves?

Answer 9

Aluminium

Question 10

What three ions produce a coloured precipitate?

Answer 10

Copper (II)
Iron (II)
Iron (II)

Question 11

What colour precipitate does copper II make?

Answer 11

Light blue

Question 12

What colour precipitate does iron II make?

Answer 12

Dirty green

Question 13

What colour precipitate does iron III make?

Answer 13

Redish-brown

Question 14

What does ammonium and sodium hydroxide produce when reacted together?

Answer 14

Ammonia and water

Nh4 + oh- —> nh3 + h20

Question 15

How do you test for ammonium ions?

Answer 15

Add sodium hydroxide
Warm the solution
Ammonia is given off as a gas
Use red litmus paper to detect it

Question 16

Is ammonia gas acid or alkaline?

Answer 16

Alkaline