You are performing titrations on several unknown acids. From your efforts you generate several titration curves. If you were told the chemical structure of the putative acids, which acid would correspond to a titration curve with exactly two equivalence points?
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Correct Answer: A. H2SO3
Generally speaking, the equivalence point is the point on a titration curve in which the number of moles of acid is equal to the number of moles of base. In an acid with one proton, there is one equivalence point; however di- and triprotic acids have more than one acidic hydrogen atom. A titration curve with two equivalence points suggests that the acid has two hydrogen atoms. Of the above choices, sulfurous acid (H2SO3) would be the only suitable choice.
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Photo attributed to Rudolf_Schuba.
