Neutralisation is a chemical reaction between an acid and a base producing a salt and water. Neutralisation may be required when pH decreases too much or rises too high.
Reasons for neutralisation
- In acidic leaching
- to discharge water of acceptable quality
- In bioleaching
- to adjust the environment to suit the bioleaching microbes. Decrease or increase pH (even though bioleaching microbes are acidophiles, pH can sink too low even for them).
The reaction between hydrochloric acid and sodium hydroxide solutions is an example of a neutralisation reaction:
Hydrochloric acid + sodium hydroxide → sodium chloride + water
HCl (aq) + NaOH (aq) → NaCl(aq) + H2O(l)
A substance used to neutralise an acidic solution. Examples of neutralisation agents include hydroxides such as sodium hydroxide and carbonate compounds such as calcium carbonate.