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 azunite, which contains ) carbonate, in concentrated sulfurie 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 folowing chemical reaction: Fe(s) +CusO4(aq)Cu(s) +FeSO (a) Suppose an industrial quality-control chemist analyzes a sample from a copper processing plant in the following way. He adds powdered iron to a 400, ml copper(II1) 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(!I) sulfate in the sample. Be sure your answer has the correct number of significant digits

Explanation / Answer

Mass of Cu ppt that was collected = 88 mg = 0.088 g

Moles of Cu collected = Mass/MW = 0.088/63.54 = 0.00138

So,

Moles of CuSO4 that were present in the solution sample = 0.00138

So,

Conc of the sample = Moles/Volume in liters = 0.00138/0.4 = 0.00345 M

Hope this helps !

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