1. Iodic acid, HIO3, can be prepared by reacting iodine, I2, with concentrated nitric acid. The skeleton equation is: I2(s) + NO3 - (aq) → IO3 - (aq) + NO2(g). Balance this equation using the half reaction method.
Solution:
Unbalanced chemical equation: I2(s) + NO3−(aq) → IO3−(aq) + NO2(g)
Oxidation half-reaction:
I20 + 6H2O − 10e− → 2IO3− + 12H+
Reduction half-reaction:
NO3− + 2H+ + e− → NO2 + H2O
Net reaction:
I20 + 10NO3− + 8H+ → 2IO3− + 10NO2 + 4H2O
Balanced chemical equation: I2(s) + 10NO3−(aq) + 8H+(aq) → 2IO3−(aq) + 10NO2(g) + 4H2O(l)
I2(s) acts as reducing agent
NO3−(aq) acts as oxidizing agent
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