Question

Balance the Redox Equation using the 1/2 rxn method:
1.) S₂O₃^2-(aq) + I₂(aq) ---> S₄O₆^2- (aq) + I^-(aq)

Balance the Redox Equation using the 1/2 rxn method (acidic):
1.) HSO₃^-(aq) + MnO₄^-(aq) ---> Mn²⁺ (aq) + SO₄^2- (aq)
2.) H₂O₂(aq) ---> O₂(g)

Balance the Redox Equation using the 1/2 rxn method (basic):
1.) HSO₃^-(aq) + MnO₄^-(aq) ---> MnO₄^2-(aq) + SO₄^2-(aq)
2.) MnO₄^2-(aq) ---> MnO₂ (aq)

Answer 1

Ans 1 :

Start balancing the reaction by writing the two half reaction oxidation and reduction seperately.

Then balance all the other atoms , except hydrogen and oxygen.

Balance oxygen and hydrogen atoms by adding water molecules and protons respectively.

Now add electrons to balance the charges , and then make electron gain = electron lost.

Then add the two half reactions together and simplify,to get the balanced reaction as :

2S2O32-(aq) + I2(aq) ---> S4O62- (aq) + 2I-(aq)