An 8.13-g sample of an ant-control preparation was decomposed by wet-ashing with H2SO4 and HNO3. The As

Question:

An 8.13-g sample of an ant-control preparation was decomposed by wet-ashing with H2SO4 and HNO3. The As in the residue was reduced to the trivalent state with hydrazine. After removal of the excess reducing agent, the As(III) required a 31.46-mL titration with 0.03142 M I2 in a faintly alkaline medium. Express the results of this analysis in terms of percentage of As2O3 in the original sample.