Elements of Life: Making Salts & Precipitation Reactions

Question 1

How do you make soluble salts

Answer 1

Metal / insoluble base + acid

Question 2

Rhyme for stages of making soluble salt from insoluble base + acid eg. Copper sulphate ( blue crystals )

Answer 2

1. Heat acid gently
2. Add insoluble substance until it no longer reacts ( in excess )
3. Filter off leftover insoluble substance
4. Heat solution to evaporate some water until crystals start to form
5. Leave solution to cool- more crystals form as cools
6. Filter off and wash the crystals of the salt
7. All the crystals to dry

Question 3

Sodium hydroxide + copper =?

Answer 3

BLUE

copper hydroxide precipitate

Question 4

Sodium hydroxide + iron (II) =?

Answer 4

DIRTY GREEN

iron (II) hydroxide precipitate

Question 5

Sodium hydroxide + iron (III) =?

Answer 5

ORANGE BROWN

iron (III) hydroxide precipitate

Question 6

Potassium iodide + lead = ?

Answer 6

BRIGHT YELLOW

lead iodide precipitate

Question 7

Silver nitrate + chlorine =?

Answer 7

WHITE

silver chloride precipitate

Question 8

Silver nitrate + bromine =?

Answer 8

CREAM

silver bromide

Question 9

Silver nitrate + iodine =?

Answer 9

PALE YELLOW

silver iodide precipitate

Question 10

Barium chloride + (something sulphate ) =?

Answer 10

WHITE

barium sulphate precipitate