Class 12 Chemistry Electrochemistry Weak electrolytes

Weak electrolytes

  • A substance which forms ions in an aqueous solution do not dissociate completely at moderate concentrations is known as weak electrolyte.
  • For example, HC2H3O2 (acetic acid), H2CO3 (carbonic acid), etc.
  • The conductance of the solution increases with dilution of solution.
  • The interionic forces of attraction are not strong at a low concentration.
  • The slope for Λm vs c1/2 is not linear even at a lower concentrations.

  • These electrolytes have lower degree of dissociation at higher concentrations.
  • The value of Λchanges with dilution due to increase in the degree of dissociation.
  • Ëm increases sharply on dilution exclusively at lower concentrations.
  • At infinite dilutionwhen concentration approaches to zero, the electrolyte dissociates completely. But at lower concentration the conductivity of a solution is low to an extent that cannot be even measured.

 

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