CHEMISTRY
posted by Anonymous .
Here's one last equation I can't balance:
Al{subscript 2}(SO{subscript 4}){subscript 3} + ZnCl{subscript 2} > AlCl{subscript 3} + ZnSO{subscript 4}
Please help, and thanks again.
Responses
Al2(SO4)3 + 3ZnCl2 > 2AlCl3 + ?___ZnSO4
What is your thinking? What goes in the blank?
I would guess that a 3 goes there. Am I correct?

CHEMISTRY 
DrBob222
Yes, a 3 goes there but why are you guessing? There are 3 Zn on the left so you need 3 Zn on the right. There are 3 SO4 [from Al2(SO4)3] on the left so you need 3 SO4 on the right. Placing a 3 in front of ZnSO4 does the job of providing 3 Zn and 3 sulfate ions on the right.
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