Weak electrolytes are only partly dissociated in solutions. The extent to which they are dissociated in a given solution is known as the 'Degree of dissociation'. Which of the following statements for this degree of dissociation in aqueous solution is true?
(A)It is inversely proportional to the square root of initial concentration of the electrolyteCorrect
(B)It is directly proportional to the initial concentration of the electrolyte
(C)It is independent of the initial concentration of the electrolyte
(D)It depends on the equilibrium concentration of the electrolyte
Answer: (A)
Solution
By Ostwald's dilution law, α≈√(Ka/C), i.e. α∝1/√C.