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Naming Hydrates
 


Naming a Hydrate

Hydrates are compounds that attract and bond with water molecules when they crystallize. The two parts of a hydrate are the anhydrous salt and the water of hydration. The ratio of these water molecules in the compound is always a whole number. A sample hydrate formula is written as follows: CuSO4•5H2O. CuSO4 is the anhydrous salt and 5H2O is the water of hydration.

Example: Name CuSO4•5H2O
Description of Action
Action
1. Name the salt.

CuSO4 is copper(II) sulfate

2. Determine the prefix to be used based on the number of water molecules. The list of prefixes used in naming hydrates are listed in a chart below. There are 5 water molecules, so you should use the prefix penta-.

copper(II) sulfate penta-
3. Add the word "hydrate" to the end of the prefix. copper(II) sulfate pentahydrate

The prefixes used for naming hydrates are as follows:
Prefix
Moles of Water
Name
Formula
mono-
1
monohydrate
XY•H2O
di-
2
dihydrate
XY•2H2O
tri-
3
trihydrate
XY•3H2O
tetra-
4
tetrahydrate
XY•4H2O
penta-
5
pentahydrate
XY•5H2O
hexa-
6
hexahydrate
XY•6H2O
hepta-
7
heptahydrate
XY•7H2O
octa-
8
octahydrate
XY•8H2O
nona-
9
nonahydrate
XY•9H2O
deca-
10
decahydrate
XY•10H2O

You may also find these related tutorials helpful
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