25.The following cell is initially at standard-state conditions. Which of the fo

Question

25.The following cell is initially at standard-state conditions. Which of the following statements is true after the cell is allowed to discharge (do work) for a period of time? Voltm eter Cu Zn* NO, Zn sa NO NO Cu Zn2+(aq) + 2e-Zn(s): Eo =-0.76 V Cu2+(aq) + 2e Cu(s); Eo = 0.34 V A) Initially Ecel,--1.10 V, and it will become more negative with time. B) Ecell does not change with time. C) InitiallyEcell=-T.10 V,and it will become more positive with time.. D) Initially Ece,-+ 1.10 V, and it will become more negative with time. E) Initially Eell 1.10 V, and it will becomes more positive with time

Explanation / Answer

Zn is losing electron

So, it is anode

So,

Eocell = Eo cathode - Eo anode

= 0.34 - (-0.76)

= 1.10 V

This is Ecell at standard condition

As time progress, more Zn2+ will form and [Cu2+] will reduce

E= Eo - 0.059/n * log ([Zn2+]/ [Cu2+])

So, with time, E will decrease

Answer: D

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