Hydrates
Hydrates ­ compounds containing water molecules in a definite ratio as part of the crystal
Anhydrous ­ compound that does not have water molecules attached
Hygroscopic ­ compound that is easily hydrated; anhydrous substance that absorbs moisture from the air
Hydrates
Naming hydrates
name the compound like usual and describe the number of water molecules using the prefixes shown below
•H2O
monohydrate
•2H2O dihydrate
•3H2O trihydrate
•4H2O
•5H2O
•6H2O
•7H2O
•8H2O
•9H2O
•10H2O
Hydrates
CoCl2 (anhydrous)
CoCl2•6H2O
Hydrates
Name or write formulas for the following compounds.
MgCl2•6H2O
NaH2PO4•9H2O
sodium chromate tetrahydrate
lead (II) acetate trihydrate
Hydrates
A 15.67 g sample of magnesium carbonate was heated, without decomposing the carbonate, to drive off the water. The mass was reduced to 7.58 g. What is the formula of the hydrate?
Hydrates
Given that the molar mass of Na2SO4•nH2O is 322.1 g/mol, calculate the value of n.
Hydrates
What is the percent of water in cobalt(II) chloride hexahydrate?