Two methods have been proposed for the analysis of sulfur in impure samples of pyrite, FeS₂. Sulfur can be determined in a direct analysis by oxidizing it to SO₄ ^2– and precipitating it as BaSO4. An indirect analysis is also possible if the iron is precipitated as Fe(OH)₃ and isolated as Fe₂O₃. Which of these methods will provide a more sensitive determination for sulfur? What other factors should be considered in deciding between these methods?

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Abstract A series of thermodynamic calculations are performed for the roasting of pyrite in changing ... View the full answer