Copper refining traditionally involves roasting insoluble sulfide ores (CuS) with oxygen. Unfortunately, the process produces large quantities

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Copper refining traditionally involves “roasting” insoluble sulfide ores (CuS) with oxygen. Unfortunately, the process produces large quantities of SO2(g), which is a major contributor to pollution and acid rain. An alternative process involves treating the sulfide ore with HNO3(aq), which dissolves the CuS without generating any SO2. The unbalanced chemical expression for the reaction is given below.

CuS(s)+ NO3-(aq) → Cu2+(aq) + NO(g) + HSO4-(aq)     (not balanced)

What volume of concentrated nitric acid solution is required per kilogram of CuS? Assume that the concentrated nitric acid solution is 70% HNO3 by mass and has a density of 1.40 g/mL.

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General Chemistry Principles And Modern Applications

ISBN: 9780132931281

11th Edition

Authors: Ralph Petrucci, Jeffry Madura, F. Herring, Carey Bissonnette

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