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How To Name Hydrates With Examples

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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