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Consider the following information about the diprotic acid, ascorbic acid. ( H2As for short, molar mass 176.1) H2AsHAs+H+pKa1=4.10(Ka=7.9105)HAsAs2+H+pKa2=11.79(Ka2=1.61012) The titration curve for disodium ascorbate, Na2As,

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Consider the following information about the diprotic acid, ascorbic acid. ( H2As for short, molar mass 176.1) H2AsHAs+H+pKa1=4.10(Ka=7.9105)HAsAs2+H+pKa2=11.79(Ka2=1.61012) The titration curve for disodium ascorbate, Na2As, with standard HCl is shown below: Which of the following is a major species present at point IV? H2As HAs As21 H+ none of these

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