Nitrite (NO 2 - ) can be determined by oxidation with excess Ce 4+ , followed by
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Nitrite (NO2-) can be determined by oxidation with excess Ce4+, followed by back titration of the unreacted Ce4+. A 4.030-g sample of solid containing only NaNO2 (FM 68.995) and NaNO3 was dissolved in 500.0 mL. A 25.00-mL sample of this solution was treated with 50.00 mL of 0.118 6 M Ce4+ in strong acid for 5 min, and the excess Ce4+ was back-titrated with 31.13 mL of 0.042 89 M ferrous ammonium sulfate.
Calculate the weight percent of NaNO2 in the solid.
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