Al2 (SO4) 3 +

3 Ca (OH) 2 →

3_CaSO4 + ? Al (OH) 3

Word equation

Al2 (SO4) 3 + 3 Ca (OH) 2 → 3CaSO4 + 2Al (OH) 3

Explanation:

1 mole of aluminium sulfate on reaction with 3 moles of calcium hydroxide gives 3 moles of calcium sulfate and 2 moles of aluminium hydroxide.

Al2 (SO4) 3 + 3 Ca (OH) 2 → 3CaSO4 + 2Al (OH) 3

here we have 2 moles of aluminium hydroxide so that aluminium on both the side can balance.