One way in which the useful metal copper is produced is by dissolving the minera
ID: 501359 • Letter: O
Question
One way in which the useful metal copper is produced is by dissolving the mineral azurite, which contains copper(II) carbonate, in concentrated sulfuric acid. The sulfuric acid reacts with the copper(II) carbonate to produce a blue solution of copper(II) sulfate. Scrap iron is then added to this solution, and pure copper metal precipitates out because of the following chemical reaction: Fe(s) + CuSO_4(aq) rightarrow Cu(s) + FeSO_4(aq) Suppose an industrial quality-control chemist analyzes a sample from a copper processing plant in the following way. He adds powdered iron to a 300. mL copper(II) sulfate sample from the plant until no more copper will precipitate. He then washes, dries, and weighs the precipitate, and finds that it has a mass of 88. mg. Calculate the original concentration of copper(II) sulfate in the sample.Explanation / Answer
Fe (s) + CuSO4 (aq) -------------> FeSO4 (aq) + Cu (s)
mass of Cu = 88.0 mg = 0.088 g
moles of CuSO4 = moles of Cu = 0.088 / 63.55
= 1.38 x 10^-3 mol
volume of solution = 300 mL
conentration of CuSO4 = 1.38 x 10^-3 / 0.3
= 4.62 x 10^-3 M
conentration ofCuSO4 = 0.29 g/L
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.