To determine the amount of magnetic, Fe 3 O 4 , in an impure ore, a 1 5419 g sample is dissolved in concentrated HCl, giving a mixture of Fe 2 and Fe 3 After adding HNO 3 to oxidize Fe 2 to Fe 3 and diluting with water, Fe 3 is precipitated as Fe(OH) 3 by adding NH 3 Filtering, rinsing, and ignitin...

In this calculationwe assume that iron is not lost and t ...

To determine the amount of magnetic, Fe 3 O 4 , in an impure ore, a 1.5419-g

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Question:

To determine the amount of magnetic, Fe ₃O ₄, in an impure ore, a 1.5419-g sample is dissolved in concentrated HCl, giving a mixture of Fe ²⁺ and Fe ³⁺. After adding HNO ₃ to oxidize Fe ²⁺ to Fe ³⁺ and diluting with water, Fe ³⁺ is precipitated as Fe(OH) ₃ by adding NH ₃. Filtering, rinsing, and igniting the precipitate provides 0.8525 g of pure Fe ₂O ₃. Calculate the %w/w Fe ₃O ₄ in the sample.