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Potassium chloride is the usual salt bridge electrolyte because its ions have nearly equal

  • A.ionic mobilities
  • B.ionic radii in solution
  • C.hydration energies
  • D.standard electrode potentials

Answer: A

Equal mobilities mean the two ions diffuse across the junction at the same rate, so almost no charge separation and hence almost no liquid junction potential develops. A salt whose ions moved at different rates would introduce an unwanted EMF.

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