H2C2O4 (aq) + H2O (l) ⇌ HC2O4- (aq)
HC2O4- (aq) + H2O (l) ⇌ C2O42- (aq)
Oxalic acid (H2C2O4) is found in toxic concentrations in rhubarb leaves. The acid forms two ions, HC2O4− and C2O42−, by the sequential loss of H + ions. Draw Lewis structures for the three species, and comment on the relative lengths and strengths of their carbon-oxygen bonds. The connections among the atoms are shown below with single bonds only.
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