Question
Asked Oct 15, 2019

27) The cycle of copper reactions illustrates important principles of chemical reactions. The cycle begins with elemental copper, which in a first reaction is oxidized to copper(II) cation. Copper(II) is then carried through different solid forms. In the last step, copper(II) cation is reduced, the copper metal is regenerated, and the cycle is closed. The five key steps are (see attached picture). Assume that you want to carry out a sequence of cycle reactions. 

By how much is zinc oxidized in the fifth reaction?

 

1. ЗСu(s) + 2NO3 + 8H*
2. Cur (аq) + 20Н (аq) — Сu(ОН), (s)
3. Cu(ОН), (s)
ЗСи* (аq) + 4Н2О + 2NO
— СuО(s) + H2O
(аq) + HэО
Zn2(aq) Cu(s)
4. CuO(s)2H Cu2
2+
5. Cu" (аq) + Zn(s
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1. ЗСu(s) + 2NO3 + 8H* 2. Cur (аq) + 20Н (аq) — Сu(ОН), (s) 3. Cu(ОН), (s) ЗСи* (аq) + 4Н2О + 2NO — СuО(s) + H2O (аq) + HэО Zn2(aq) Cu(s) 4. CuO(s)2H Cu2 2+ 5. Cu" (аq) + Zn(s

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check_circleExpert Solution
Step 1

Number of equivalents = number of moles × n- factor

Number of moles = Molarity ×Volume

Therefore,

Number of equivalents = Molarity ×Volume × n- factor

Where, n-factor is valence or charge.

The required reaction is given below.

Cu2 (aq)+Zn (s)Zn2(aq)+Cu(s)
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Cu2 (aq)+Zn (s)Zn2(aq)+Cu(s)

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Step 2

Here, 1 equivalent of Cu2+ is reacting with 1 equivalent of Zn. According to law of equivalents, it can be written ...

1
-x2 0.0315
63.5
Number of equivalent of copper
Number of equivalents of copper Number of equivalents of Zn
0.0315 Number of moles of Zn x n-factor
Number of moles of Zn x 2
0.0315
0.0315
=0.0157 mol
2
Number of moles of Zn
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1 -x2 0.0315 63.5 Number of equivalent of copper Number of equivalents of copper Number of equivalents of Zn 0.0315 Number of moles of Zn x n-factor Number of moles of Zn x 2 0.0315 0.0315 =0.0157 mol 2 Number of moles of Zn

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