Potential difference, electrical work done and AG for the cell reaction

12 Potential difference, electrical work done and AG for the cell reaction 

This cell has a positive emf. Hence the reactions acmally occurring are the same as those inferred from the way in which the cell is written. 

Left hand electrode is negatively charged, electrons are produced and reaction is Zn(s) — Zn +(aq) + 2e. 

Right hand electrode is positively charged, electrons flow to it from the Zn(s) Zn (aq) electrode and the reaction is 2AgCl(s) + 2e — 2Ag(s) + 2Cl (aq). 

If Zn(s) is dipped into a solution of Zn (aq) ions nothing happens. But if it is joined by a wire which allows electrons to flow along it, and if, at the end of the wire, there is something which will take up these electrons then the Zn will start going into solution as Zn (aq) and will generate electrons. It will continue to do so until either the Zn(s) is all used up, or until the system receiving the electrons can no longer take them up. 

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