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Explain about the Galvanic cell

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Galvanic Cell

  • The Daniel cell is a typical galvanic cell. It is designed to make use of the spontaneous redox reaction between zinc and cupric ion to produce an electric current.
  • The Daniel cell can be conventionally represented as
    \\\mathrm{Zn}(\mathrm{s})\left|\mathrm{ZnSO}_{4}(\mathrm{aq})\right|\left|\mathrm{CuSO}_{4}(\mathrm{aq})\right| \mathrm{Cu}(\mathrm{s})\\\mathrm{ \quad \quad \quad \quad \quad \: \: \: \: Saltbridge}
  • The Daniel cell reaction is represented as:
    $\mathrm{Zn}(\mathrm{s})+\mathrm{Cu}^{2+}(\mathrm{aq}) \rightarrow \mathrm{Zn}^{2+}(\mathrm{aq})+\mathrm{Cu}(\mathrm{s})$
  • In Daniel cell, electrons flow from zinc electrode to copper electrode through the external circuit while metal ions flow from one-half cell to the other through  the salt bridge.
  • Here current flows from the copper electrode to zinc electrode that is, cathode to anode in the external circuit.
  • Daniel cell is a reversible cell while a voltaic cell may be reversible or irreversible.
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