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27-06-2016
Chemistry

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A good practice for balancing equations with polyatomic ions is:

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Аноним Аноним

27-06-2016

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

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