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 100.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 141.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

Fe (s) + CuSO4 (aq) Cu (s) + FeSO4 (aq)

Mass of Cu obtained = 141 mg. = 0.141 g.

Molar mass of Cu = 0.141 / 63.5 = 0.00222 mol

Accoding to above banlanced equation,

1 mol Cu is formed from 1 mol CuSO4

then, 0.00222 mol Cu can be formed from 0.00222 mol CuSO4

So, moles of copper sulphate in original solution = 0.00222 mol

Volume of solution = 100. mL = 0.100 L

Therefore,

Molarity of original copper sulphate solution = 0.00222 / 0.100 = 0.0222 M

Related Questions

Navigate

• Browse (All)
• Browse O
• Subjects

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