Hydrated ionic compound
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Hydrated ionic compounds are those ionic compounds which contain water molecules inside their crystal lattice.[1] The water is not chemically bonded to the crystal in any way, and may be driven off by heating the hydrated compound.
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[edit] Rules for naming
There exist two systems for the naming of hydrated ionic compounds.
[edit] First system
- The ionic compound must be named using the proper rules for naming ionic compounds.
- The correct Greek prefixes must be added to the term "hydrate" as to indicate the number of water molecules per formula unit. Example: Monohydrate(one), Dihydrate(two), Trihydrate(three) etc.[2]
- To write the chemical formula; write the ionic compound then write a "dot" followed by "H2O" with the number corresponding to the prefix attached to the "hydrate" from the "word" equation. Example(s):[2]
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- ZnCl2 • 6H2O is zinc chloride hexahydrate
- Ba(OH)2 • 8H2O is barium hydroxide octahydrate
[edit] Second system
Naming prefixes include:
- Hemi - 1/2
- Mono - 1
- Di - 2
- Tri - 3
- Tetra - 4
- Penta - 5
- Hexa - 6
- Hepta - 7
- Octa - 8
- Nona - 9
- Deca - 10
If there is no water, the prefix is anhydrous.
[edit] References
- ^ Roebuck, C.M. (2000). Excel Preliminary Chemistry: New Course. Pascal Press. p. 85. ISBN 9781740200868.
- ^ a b Kenkel, John; Paul B. Kelter, David S. Hage (2000). Chemistry: An Industry-based Introduction. CRC Press. p. 119. ISBN 9781566703031.
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