9. Hydrates

Some ionic compounds release water when heated.
The water molecules are loosely bonded within the
solid crystal at regular intervals.

Ex: Na2CO3 • 10 H2O is sodium carbonate decahydrate




The “ • “ indicates a weak bond between the Na2CO3 and
the ten water molecules.
First part of compound named according to IUPAC rules.
Second part is the number of water molecules using
the prefix system.
Try These
CuSO4•5H2O
Ca(NO3)2•3H2O
manganese (II) chloride tetrahydrate
zinc sulphate heptahydrate
10. Other Commonly Named Chemicals and Formulas
Common names are often used chemistry.
IUPAC Name
Sodium bicarbonate
Dinitrogen monoxide
Sodium thiosulphate
Nitrogen trihydride
Formula
NaHCO3
N2O
HCl(aq)
Na2S2O3
H2O
Common Name
baking soda
laughing gas
muriatic acid
hypo