Making Salts

Question 1

Give examples of soluble salts

Answer 1

Chlorides, Sulphates and Nitrates.

Question 2

Give examples of an insoluble base

Answer 2

Metal oxide or metal hydroxide

Question 3

What is the process of making soluble salts using a metal oxide/hydroxide?

Answer 3

1. Add excess metal oxide/hydroxide to your acid and stir to dissolve to form a salt.
2. Filter out the excess.
3. Allow H2O to evaporate leaving the salt.

Question 4

What is the process of making soluble salts using an alkali and acid? (titration)

Answer 4

1. Add exactly the right amount of acid and alkali using the indicator to give the exact neutralisation.
2. Repeat with the same volume without indicator to avoid contamination.
3. Evaporate off water, leaving the salt.

Question 5

What is the process of making insoluble salts (the precipitation reaction) ?

Answer 5

1. Mix two solutions that contain the required ions.

2. Filter to leave the salt.

Question 6

Where can can the precipitation reaction be used in industry?

Answer 6

In water purification

1. Removing poisonous ions
2. Removing hardness on water
3. Treating sewage.