3.4.4 Acid + Base reaction

Question 1

What do bases form when reacting with acid?

Answer 1

Salt and water

Question 2

Acid + Base —>

Answer 2

Salt + Water

Question 3

What is an observation of the base + acid reaction?

Answer 3

The base disappears

Question 4

Why does the base disappear in an acid + base reaction?

Answer 4

It is used up

Question 5

How to make soluble salt crystals with an acid + base reaction, from an insoluble base?

Answer 5

• Add excess base to hot acid. Hot acid has more energy so it will react faster with the base.
• Filter out the excess base. The salt solution is the filtrate and is collected in an evaporating basin.
• Heat the salt solution until the crystals start to form around the edges. This saturates the solution so that crystals form more efficiently.
• Leave the salt solution to crystallise. Evaporation of water allows crystals to form.
• Dry the crystals by dabbing them with a paper towel.