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The function of a salt bridge in a galvanic cell is to

  • A.supply the ions consumed in the cell reaction
  • B.increase the cell's EMF above its standard value
  • C.prevent the electrodes from becoming polarised in use
  • D.complete the circuit while preventing the solutions mixing

Answer: D

It carries the ionic current and neutralises the charge that would otherwise build up in each compartment, so the cell can keep working. Potassium chloride is used because its cation and anion have almost equal mobilities.

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