About 200 Mt of sodium chloride are consumed every year in the world.
Some sodium chloride will be added to food, some will be used as a highway de-icing agent in cold climates, but most of it will be used in industries such as leather tanning, dye manufacturing, paper production, and in the production of other chemicals such as sodium carbonate, sodium hydroxide and chlorine.
The largest source of sodium chloride is the world's oceans.
So, how hard can it be to produce sodium chloride?
Surely you just evaporate the water off seawater and "hey presto", sodium chloride!
In reality, it's not quite that simple .....
To subscribe to AUS-e-NEWS, AUS-e-TUTE's free quarterly newsletter, email :