for a reactant in solution One way in which the useful metal copper is produced
ID: 304095 • Letter: F
Question
for a reactant in solution 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) + Feso,(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 250. 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 134. 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
Molar mass of Cu = 63.55 g/mol
mass of Cu = 0.134 g
mol of Cu = (mass)/(molar mass)
= 0.134/63.55
= 2.109*10^-3 mol
According to balanced equation
mol of CuSO4 reacted = moles of Cu formed
= 2.109*10^-3 mol
Molar mass of CuSO4,
MM = 1*MM(Cu) + 1*MM(S) + 4*MM(O)
= 1*63.55 + 1*32.07 + 4*16.0
= 159.62 g/mol
mass of CuSO4 = number of mol * molar mass
= 2.109*10^-3*1.596*10^2
= 0.3366 g
concentration = mass of CuSO4 / volume in L
= 0.3366 g / 0.250 L
= 1.35 g/L
Answer: 1.35 g/L
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