ELECTROCHEMISTRY SERIES PART 3

ELECTROCHEMISTRY

Quantitative Electrolysis

Faraday discovered that the mass of substance discharged is proportional to the quantity of current passing it.

1 Coulomb  =  Current    x time      C – quantity of electricity

C   =  It                                                 t – time in seconds                     I – current in amperes

1 mole of electron has a charge of 96, 500C so;

M+    +   e   →   M        requires 96, 500C

M2+   +  2e  →  M        requires  2  x  96, 500C

M3+   +

E.g. What mas of magnesium is deposited at the cathode by passing  2A through molten MgCl2 for 30 min?

  1. C  = It
  2. To find mass  Mg2+   +  2e   →  Mg requires …….
  3. 1mol Mg   =   24g

Applications of Electrolysis

  • Electrolysis is used to produce sodium Na.
  • Electroplating

Electroplating

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