Naming Hydrates

There are many solid compounds that release water when heated at fairly low temperatures. In these compounnds the water molecules are loosely bonded within the solid crystal at regular intervals.

CuSO_4H20

The penta indicates five water molecules for each copper (II) sulphate particle and the " " indicates a weak bond between the CuSO₄ and the five water molecules.

The table below shows the prefixes which are used to indicate the number of water molecules.

mono	one
di	two
tri	three
tetra	four
penta	five
hexa	six
hepta	seven
octa	eight
nona	nine
deca	ten

Remember...practice makes perfect!

1. zinc sulphate heptahydrate ZnSO4 . 7H2O

2. copper (I) sulphite monohydrate Cu2SO3 . H2O

3. cobalt (II) fluoride tetrahydrate CoF2 . 4H2O

4. lithium nitrate trihydrate LiNO3 . 3H2O

5. sodium sulphate decahydrate Na2SO4 . 10H2O

6. calcium nitrate trihydrate Ca(NO3)2 . 3H2O

7. calcium sulphate hexahydrate CaSO4 . 6H2O

8. sodium phosphite tetrahydrate Na3PO3 . 4H2O

9. aluminum hypochlorite octahydrate Al(ClO)3 . 8H2O

10. cesium carbonite dihydrate Cs2CO2 . 2H2O

11. Na₂SO₄ 10H₂O sodium sulphate decahydrate

12. LiNO₃ 3H₂0 lithium nitrate trihydrate

13. Cu₂SO₃ 3H₂0 copper sulphate trihydrate

14. Ca(N0₃) ₂ 2H₂0 calcium nitrate dihydrate

15. NaCl0₄ H₂0 sodium perchlorate monhydrate

16. MgS0₄ 7H₂0 magnesium sulphate heptahydrate

17. Cs₂CO₂ 2H₂0 cesium carbonite dihydrate

18. ZnS0₄ 7 H₂0 zinc sulphate heptahydrate

19. Na₃P0₃ 4H₂0 sodium phoshite tetrahydrate

20. Ni(N0₃) ₂ 6H₂0 nickle nitrate hexahydrate

Try the nomenclature test and hand it in to your teacher!

E-mail me and let me know how you did! dbilic@sympatico.ca

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