Questions/P Block elements G15-18/Why is $$K_{a2} \ll ...
Group 16 ElementsP Block elements G15-18

Why is Ka2≪Ka1K_{a2} \ll K_{a1} for H2SO4H_{2}SO_{4} in water?

Expert Answer

H2SO4H_{2}SO_{4} is a strong acid (Ka1K_{a1} is large) ionizing to H3O+H_3O^+ and HSO4−HSO_4^-. The ionization of HSO4−HSO_4^- to SO42−SO_4^{2-} (Ka2K_{a2}) is very small.

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