18. Solving a chemistry problem
5. To determine lead in the ore, a 5.0000 g sample of the ore was taken. When dissolved in acid, the Pb2+ ion was precipitated in the form of lead chromate. The precipitate was filtered off and dissolved in a mixture of potassium iodide and hydrochloric acid. The iodine released as a result of the reaction was titrated with a 0.05000 N solution of thiosulfate - 42.00 ml of which was consumed. How much lead (in%) did the ore contain?
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