C7. Acids, bases and salts

Question 1

Acid + metal =

Answer 1

salt + hydrogen

Question 2

Acid + hydroxide =

Answer 2

salt + water

Question 3

Acid + oxide =

Answer 3

salt + water

Question 4

acid + metal carbonate =

Answer 4

salt + carbon dioxide + water

Question 5

acid + ammonia solution =

Answer 5

salt + water

Question 6

When sulfur burns with oxygen, what color is the flame?

Answer 6

blue

Question 7

What are salts?

Answer 7

ionic compounds

Question 8

Explain the experiment for salts

Answer 8

Warm some acid gently (to speed up the reaction)
Add to the acid an excess of either the metal, metal oxide or metal carbonate. This ensures all the acid has been neutralised . For the reactions involving metals or metal carbonates you may need to leave aside until the evolution of gas has stopped.
Filter the mixture to remove the excess solid (Figure 2).
Transfer to an evaporating dish and evaporate some of the water off over a Bunsen burner until crystals start to form.
Leave to cool.
Filter to get the crystals.
Dry the crystals on filter paper.