A good practice for balancing equations with polyatomic ions is:

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Chemistry

6 May, 03:11

A good practice for balancing equations with polyatomic ions is:

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Aria Donaldson · Answer 1

For example to balance the equation:

AlCl3 + Na2SO4 - - - > Al2 (SO4) 3 (ppt) + NaCl

Balance the polyvalent atoms (Al, SO4) first. Then everything else falls into line. You need two Al's on the reactants side, but you also need 3 sulfates, so:

2AlCl3 + 3Na2SO4 - - - > Al2 (SO4) 3 + 6NaCl