Question

Explain daniel cell with cell diagram, representation and process taking place in the cell.

Answer 1

An electrochemical cell is a device which can convert the chemical energy to electrical energy. A good example is Daniel cell.

Daniel cell consists of 2 half cells:

A Zn rod placed in contact with $ZnS{O}_4$ & a Cu metal in contact with $CuS{O}_4$ solution. These are connected by salt bridge consisting a saturated solution of either $KCl,KN{O}_{3}orN{H}_{4}N{O}_3$.

(Refer to Image)

Cell reactions:

At Anode :

$Z{n}_{\left(s\right)}⟶Z{n}_{\left(aq\right)}^{2+}+2e-$ (Oxidation)

At Cathode :

$C{u}_{\left(aq\right)}^{2+}+2e^{-}⟶C{u}_{\left(s\right)}$ (Reduction)

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Overall reaction,

$Z{n}_{\left(s\right)}+C{u}_{\left(aq\right)}^{2+}⟶Z{n}_{\left(aq\right)}^{2+}+C{u}_{\left(s\right)}$