A schematic of the cycle of copper reactions is shown below. (2) Cu(s) Cu(NO32 (

Question

A schematic of the cycle of copper reactions is shown below. (2) Cu(s) Cu(NO32 (aq) HNO3 Cu(OH)2(s) NaOH Zn(s) H2SO4 CuSO4 (aq) CuO(s) (4) Solid copper is initially dissolved in concentrated nitric acid (1), producing Cu(NO3) and gaseous NO2. To this solution, sodium hydroxide is added (2), resulting in the precipitation of Cu(oH)2. Upon heating (3), the Cu(oH)2 decomposes to cuo. sulfuric acid is added to the Cuo (40, producing Cuso,. Finally, solid zinc is added (5) and solid copper is regenerated. By massing the copper before and after this cycle of eactions, the percent recovery can be calculated. mass Cu (after) x 100 mass Cu (before) Percent Recovery TY PRECAUTIONS centrated (16 M) nitric acid is a potent oxidizing agent, which may produc skin discoloration, and lung irritation. As such, the nitric acid mu ain in the fume hood at all times. In addition, the dissolution of copper wire in th ic acid produces toxic NO2 gas; this reaction must also take place in the fume hoo lly, methanol is flammable and its vapors are toxic. Use it in the fume hood an it away from open flames.

Explanation / Answer

2NaOH(aq]+Cu(NO3)2(aq]Cu(OH)2(s]+2NaNO3(aq)

No.of moles of copper(II) nitrate = 0.8024/187.56 = 4.27 milli moles

No.of moles of NaOH required according to stoichiometry of the reaction = 2*4.27 = 8.55 milli moles

Volume required = 8.55/3 = 2.85 ml

Moles of copper(II) hydroxide produced according to stoichiometry assuming 100%yield = 4.27*1 =4.27 millimoles

Mass of copper(II) hydroxide produced assuming 100%yield= 4.27*10^-3*97.561 = 0.417 gms

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