8.5: Problems
24. Two methods have been proposed for the analysis of pyrite, FeS 2, in impure samples of the ore. In the first method, the sulfur in FeS 2 is determined by oxidizing it to (text{SO}_4^{2-}) and precipitating it as BaSO 4. In the second method, the iron in FeS 2 is determined by precipitating the iron as Fe(OH) 3 and isolating it as Fe 2 …