Redox reactions. What am I doing wrong? Map Sapling Learning macmillan learning

Question

Redox reactions.

What am I doing wrong?

Map Sapling Learning macmillan learning For a particular redox reaction NO2 is oxidized to NO3 and Fe3+ is reduced to Fe2 Complete and balance the equation for this reaction in basic solution. Phases are optional. NO, + 2 Fe3 + + H2O No, +3Fe2 + +20H- No; +3Fe+20 There is additional feedback available! View this feedback by clicking on the bottom divider bar. Click on the divider bar again to hide the additional feedback. Close Previous Give Up & View Solution Try Again Next Exit

Explanation / Answer

Basic means OH- not H2O and also you have taken 2Fe3+ left side and showing 3Fe3+ at right side of equation this means one more Fe ion excess in product.

Half reaction 1: NO2- + 2OH- --> NO3- + H2O + 2e-
Half reaction 2: Fe3+ + e- --> Fe2+
Multiply the second half reaction by 2 to eliminate all e-
So,
NO2- + 2Fe3+ + 2OH- --> NO3- + 2Fe2+ + H2O

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