Hydrates are ionic compounds that contain weakly bound water molecules. We can recognize a hydrate by noticing *_ H2O after the ionic formula such as: Ba(OH)2*8H2O.
To name a hydrate, we name the ionic compound followed by prefix representing the number of water molecules and then hydrate.
Prefixes are:
mono=1, di=2, tri=3, tetra=4, penta=5, hexa=6, repta =7, octa=8, nona=9, deca=10
Let's do some examples.
Ba(OH)2*8H2O = barium hydroxide octahydrate
CuSO4*5H2O = copper(II) sulfate pentahydrate
MgSO4* 7H2O = magnesium sulfate heptahydrate
CaSO4*2H2O = calcium sulfate dihydrate
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