One way in which the useful metal copper is produced is by dissolving the minera

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) cuso4(aq) Cu(s) Feso4(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 350. 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 147. mg. Calculate the original concentration of copper(II) sulfate in the sample. Be sure your answer has the correct number of significant digits.

Explanation / Answer

1. Original concentration of CuSO4(aq)= 2.31X10^-3mol/0.350L= 6.61X10^-3M

or 1.05 g/L

2. 0.033 mol of FeBr2 therefore moles of [Br-]= 0.066mol

moles of Ag+= 0.035mol

moles of Br- remaining in solution= 0.031mol

molarity of Br-= 0.031/0.050L= 0.62M

1st and third reactions are redox reactions

1st- Zn-reducing agent ; oxidizing agent is CuSO4

3rd reaction- C(s) is the reducing agent; oxidizing agent is O2 (g)

Related Questions

Navigate

• Browse (All)
• Browse O
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.