For polyprotic acids, ionization constants for successive ionization steps decrease rapidly That is,K a1 K a2 K a3 The ionization constants for the first two steps in the ionization of Fe(H 2 O) 6 3 (reactions 24 10 and 24 11) are more nearly equal in magnitude Why does this multistep ionization seem not to follow the pattern for polyprotic acids Reaction 24 10 Reaction 24 11 Fe(HO)6 HO FeOH(HO)5 2 H3O K 9 x 104 (24 10)

Question: For polyprotic acids, ionization constants for successive ionization steps decrease rapidly. That is,K a1 K a2 K a3 . The ionization constants for

For polyprotic acids, ionization constants for successive ionization steps decrease rapidly. That is,K_a1 ≫ K_a2 ≫ K_a3. The ionization constants for the first two steps in the ionization of [Fe(H₂O)₆]³⁺ (reactions 24.10 and 24.11) are more nearly equal in magnitude. Why does this multistep ionization seem not to follow the pattern for polyprotic acids?

Reaction 24.10

Reaction 24.11

[Fe(HO)6]+ + HO = [FeOH(HO)5]2+ + H3O+ K =9 x 104 (24.10)

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