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UPSC Chemistry

Nidhi T.
26/08/2017 0 0

Explain the scientific basis of functioning of fluoride ion selective electrode.

  • Indicator electrodes are usually ion-selective electrodes that are sensitive to a specific ion.
  • The potential of an ideal indicator electrode changes rapidly and in a reversible way, and is strongly related with the concentration of the analyte. One important group of indicator electrodes is membrane electrodes, such as the fluoride ion selective electrode.
  • A fluoride ion selective electrode is a type of ion selective electrode sensitive to the concentration of the fluoride ion. A common example is the lanthanum fluoride electrode. In the lanthanum fluoride electrode, the sensing element is a crystal membrane of lanthanum fluoride (LaF3), doped with europium fluoride (EuF2).
  • The inner surface of the crystal is in contact with the inner reference solution, and the outer surface of the crystal is in contact with the solution containing the analyte . A potential develops across the membrane that depends on the difference in the concentration of fluoride ion on each side of the membrane.
  • Since the concentration of the internal solution is fixed, the potential developed across the membrane is related to the concentration of the analyte.

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