Rule 1: Include the water at the end of the formula. There is a dot separating the regular compound formula and the water.
Rule 2: Put a number after the dot and before the H2O to indicate how many water molecules are associated with the compound.
WRITING FORMULAS
Rule 1: Name the regular part of the compound as usual.
Rule 2: After the regular compound name, put the word "hydrate".
Rule 3: Use a number
prefix in front of "hydrate" to show how many water molecules are
associated with the compound.
| 1 = mono | 6 = hexa | |
| 2 = di | 7 = hepta | |
| 3 = tri | 8 = octa | |
| 4 = tetra | 9 = nona | |
| 5 = penta | 10 = deca |