C13 - Carbonates

Question 1

Manufacturing calcium oxide (lime) (3 steps)

Answer 1

By thermally decomposing calcium carbonate (limestone)
1. Takes place in a furnace called a lime kiln which rotates and the limestone is heated by current of strong hot air
2. Since this is a reversible reaction, the carbon dioxide produced is carried out of the kiln
3. The calcium oxide is removed at the bottom of the kiln

Question 2

Use of limestone

Answer 2

Used to treat acidic soil and industrial waste in order to neutralise it
* sulfur dioxide that factories produce are reacted with calcium oxide so that it doesn’t mix with the air and cause acid rain