What is acid with two ionizable protons?

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Answer 1 · 2017-04-06T05:01:12

#"A diacid............"#

And the best example is #"sulfuric acid"#, which can donate two protons to aqueous solution:

#H_2SO_4(aq) rightleftharpoons HSO_4^(-) + H_3O^+#

This equilibrium lies quantitatively to the right,

The second equilibrium, that which describes the acidity of #"bisulfate anion"#, lies to the right........

#HSO_4^(-) +H_2O rightleftharpoons SO_4^(2-) + H_3O^+#

Overall:

#H_2SO_4 + 2H_2O rarr 2H_3O^+ + SO_4^(2-)#.

We could find other diacids, but NONE as strong as #"sulfuric acid"#.