47 3. Balance the following redox reaction under acidic conditions using the half-reaction method. Na2S2O3 (aq)...

Question

Question

47 3. Balance the following redox reaction under acidic conditions using the half-reaction method. Na2S2O3 (aq) + 12 (aq) → N

Answer 1

Answer #1

Na2S2O3(aq) + I2(aq) ---------> NaI(aq) + Na2S4O6(aq)

Skeleton ionic equation

S2O3^2-(aq) + I2(aq) ---------> I^-(aq) + S4O6^2-(aq)

oxidation half reaction reduction half reaction

S2O3^2-(aq) -----> S4O6^2-(aq) I2(aq) --------> I^-(aq)

2S2O3^2-(aq) -----> S4O6^2-(aq) I2(aq) --------> 2I^-(aq)

2S2O3^2-(aq) -----> S4O6^2-(aq)+2e^- I2(aq)+2e^- --------> 2I^-(aq)

2S2O3^2-(aq) -----> S4O6^2-(aq)+2e^-

I2(aq)+2e^- --------> 2I^-(aq)

---------------------------------------------

2S2O3^2- (aq) + I2(aq) ---------> S4O6^2- (aq) + 2I^- (aq)

2Na2S2O3(aq) + I2(aq) ---------> 2NaI(aq) + Na2S4O6(aq)

Answer 2

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