Box 15.9 deals with the nitrogen cycle and the removal of nitrates and nitrites from waste water.
(a) Urea is used to reduce |NO2] to N2. Write a balanced equation for ihe reaction of HNO2 with urea,
(b) (b) Sulfamic acid is also used to reduce [NO2J~ to N2 during water treatment. Give an equation for this reaction, (c) Nitrites can be removed using H2O2, [OCl| or HOC1 as oxidants. How does the reduction potential for the following process depend on pH? [NO3]~(aq) + 3Hh(aq) + 2e~^ HNO2(aq)+H2O(l)
Suggest products for the reduction of H2O2 and HOC1 in acidic, aqueous solution. Give equations for the reactions of H2O2 with [NO2| in acidic solution, and for [OCl| with |NO21 in alkaline solution.
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