Word equation and balanced equation help!?

Ensure the number of atoms and charge is the same on both the left and right side of the equation. Since you start with Br2, I'd expect 2 Br atoms or ions on the right hand side. Br?

+ S2O3^2- + H2O -> 2Br^- + SO4^2- + H+ (not balanced) Now look at the sulfur atoms and you'll see these need work as well. Br? + S2O3^2- + H2O -> 2Br^- + 2SO4^2- + H+ (not balanced) Next look at the oxygen atoms Br?

+ S2O3^2- + 5H2O -> 2Br^- + 2SO4^2- + H+ (not balanced) Next look at the hydrogen atoms Br? + S2O3^2- + 5H2O -> 2Br^- + 2SO4^2- + 10H+ (not balanced) Lastly balance the amount of bromine to ensure charges match. Bromine is the obvious candidate to adjust, since it doesn't effect the ionic compound SO4^2- in the product.

4Br? + S2O3^2- + 5H2O -> 8Br^- + 2SO4^2- + 10H+ (balanced).

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