In polyprotic acids, the first ionizable hydrogen always ionizes to a greater extent than the second or third ionizable hydrogen(s).

Question

Quizplus · Accepted Answer

This is because the first ionization removes the hydrogen from the most electronegative atom, making it easier for subsequent ionizations to occur. As more hydrogen ions are removed, the remaining ones are held more tightly by the remaining atoms, making them more difficult to remove.

In Polyprotic Acids, the First Ionizable Hydrogen Always Ionizes to a Greater