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Polyprotic acids contain more than one dissociable proton. Each dissociation step has its own acid-dissociation constant,...

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Chemistry

Polyprotic acids contain more than one dissociable proton. Eachdissociation step has its own acid-dissociation constant, Ka1, Ka2,etc. For example, a diprotic acid H2A reacts as follows:H2A(aq)+H2O(l)⇌H3O+(aq)+HA−(aq) Ka1=[H3O+][HA−][H2A]HA−(aq)+H2O(l)⇌H3O+(aq)+A2−(aq) Ka2=[H3O+][A2−][HA−] In general,Ka2 = [A2−] for a solution of a weak diprotic acid because[H3O+]≈[HA−].

Many household cleaning products contain oxalic acid, H2C2O4, adiprotic acid with the following dissociation constants:Ka1=5.9×10−2, Ka2=6.4×10−5. Part A Calculate the equilibriumconcentration of H3O+ in a 0.20 M solution of oxalic acid. Expressyour answer to two significant figures and include the appropriateunits.

Answer & Explanation Solved by verified expert
3.7 Ratings (713 Votes)
For the first dissociationH2C2O4 H HC2O4 Ka1 005IC 02 0 0EC 02x x xKa1 H HC2O4 H2C2O40059 x2 02xx2 0059 02 xx2 00118    See Answer
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