53 days before CSEC Chemistry Paper 2
Daily revision is from Acids, Bases & Salts.
Acid anhydride literally means acid “without hydrogen” or what we would call a “dry acid” since the hydrogen is coming fro the water. (See below) (Prefix ‘an” means without and “hydride” from word which means hydrogen.
The formal definition is the oxide of a non-metal which forms an acid when dissolved in water.
To break that down further, a compound made of a non-metal and oxygen, which when you wet it up or add water to it, becomes an acid.
1. Sulphur dioxide (1 (atom) of sulphur with 2 (atoms) of oxygen
SO2 (g) + H2O (l)–> H2SO3 (aq) (numbers are subscripts)
2. Carbon dioxide (1 (atom) of carbon with 2 (atoms) of oxygen.
CO2 (g) + H2O(l) –> H2CO3 (aq)
3. nitrogen dioxide aka nitrous (IV) oxide (1 (atom) of nitrogen with 2 (atoms) of oxygen.
NO2 (g) + H2O (l) –> HNO3 (aq)
The acids formed are sulphurous acid, carbonic acid and nitric acid respectively.
These acid anhydrides (SO2, CO2 and NO2…plus many more) all give rise to acid rain when their vapours mix with water vapour and they form aqueous acids now.
Aqueous means they are now in the presence of water. (Aqua).
So there you have it, Chemistry has a lot to do with origin of words.
Also, it cannot be an acid if it is “without hydrogen.”
Will pick up on <– “this” tomorrow as the countdown continues.
Contributed by: Kemil Walford