Question

Question 15 of 15 incorrect ncorech incorrect incorrect incorrect Consider two oeils, the first with AIand Ag electrodes, and the second with Zn and Ni electrodes, each in appropriate 100 M solutions oftheir ons a)rt connected as voitaic cells in series, which two metals are plated, and what is the total potential? Al(s) Number Ag(s Ni(s b) If connected such that one cell acts as a battery to power the other as an electrolytic cell, which two metals are plated, and what is the total potential? Ag(s) Zn(s) E Ni(s) c) lf 3-20 g of metal is plated in the voltaic cell, how much metal is plated in th o Previous ® Give up s view solution check Answer o Ned AExit H Hint

Answer 1

a) Al $\rightarrow$ Al³⁺ + 3e^-                 E= +0.67V

Ag⁺ + e- $\rightarrow$ Ag                    E= +0.80V

Zn $\rightarrow$ Zn²⁺ + 2e^-                   E= +0.76V

Ni²⁺ + 2e^-$\rightarrow$ Ni                    E= -0.25V
......... ............... ........         E = +1.98V total potential

Ni and Ag plated out.

b) Ni and Ag are plated out; the potential is the same i.e E=+1.98V

c) Atomic weights: Ag=108, Ni=59

$= 4.70gAg\; \ast \; \frac{1molAg}{108gAg}\ast \frac{2molNi}{1molAg}\; \ast \frac{59gNi}{1molNi} = 5.13g\: Ni$