Chapter 3: Amount of substance (3.1-3.4)
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Water of crystallisation
water molecules that are bounded into a crystalline structure of a compound
Moles =
mass / Mr
Explain what the difference is between a hydrated and an anhydrous salt
Hydrated salts have water within their crystals when the crystals are formed from water; an anhydrous salt is where the crystal has had the water driven out. Water of crystallisation occurs for two reasons
What is the difference between one mole go H and one mole of H2?
One mole of H is one mole of hydrogen atoms and one mole of H2 is one mole of hydrogen molecules.
Why do blue crystals of hydrated copper (ii) sulphate turn white when heated?
Bonds holding the water within the crystal are broken and the water is driven off.
How do you work out the water of crystallisation?
1) Calculate the amount, in mol, of the anhydrous salt formed 2) Calculate the mass and amount , in mol, of water 3) Divide by the smallest number of moles: simplest whole number ratio 4) Write down the value of X and write in the formula of the salt