Question

A voltaic cell which is constructed with Sn+2/Sn (Ereduction=-0.14V) and Zn+2/Zn (Eoxidation=-0.76V) is represented by Zn|Zn+2(1M)||Sn+2|Sn(1M). What is the emf of the cell?

Answer 1

`E_text(cell) = "+0.62 V"`

Explanation:

To answer this question, we determine the standard potential of the voltaic cell using the two half-cell potentials.

`color(white)(mmmmmmmmmmmmmmmmmmmmmmmmmmm)E^@"/V"`
Anode: `color(white)(m)1×["Zn(s)" → "Zn"^"2+""(aq)" + "2e"^"-"]color(white)(mmmmmmml)"+0.76"`
Cathode: `1×["Sn"^"2+""(aq)" +"2e"^"-" → "Sn(s)"]color(white)(mmmmmmmm)"-0.14"`
Cell: `color(white)(mmmmll)"Zn(s)" + "Sn"^"2+""(aq)" →"Zn"^"2+""(aq)" + "Sn(s)"color(white)(m)"+0.62"`

`E_text(cell)^@ = "+0.62 V"`