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QUESTION

# What is the formula for aluminum sulfate?

Al_2(SO4)_3

Aluminium cations carry a 3+ charge and sulfate anions carry a 2- charge, which means that in order to get a neutral compound, you're going to need two aluminium cations and three sulfate anions.

2Al^(3+) + 3SO_4^(2-) => Al_2(SO4)_3