Answered: Predict the stronger acid in each…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter14: Acids And Bases

Section: Chapter Questions

Problem 45E: Use Table 13-2 to order the following from the strongest to the weakest acid. HClO2,H2O,NH4+,HClO4

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Question

Predict the stronger acid in each pairH2C2O4 or HC2O4 -

Expert Solution

Step 1

H₂C₂O₄ and HC₂O₄^- are acidic in nature.

Step 2

Acids are the substance that is capable of donating H⁺ion to a basic substance. Since both of the compounds contain hydrogen atom and hence it can be released as H⁺ ion and they are acidic in nature.

$H_{2} C_{2} O_{4} {→ HC}_{2} {O_{4}}^{-} + H^{+} {HC}_{2} {O_{4}}^{-} \to C_{2} {O_{4}}^{-} {+ H}^{+}$

Step 3

Oxalic acid is a stronger acid than HC₂O₄^-. It is very easy for oxalic acid to donate an H⁺ to a base when compared with HC₂O₄^-, it can be explained by using the conjugated acid base concepts.

Oxalic acid loses an H⁺ ion to form HC₂O₄^-, since HC₂O₄^- is the conjugated base of the oxalic acid, HC₂O₄^- has a greater tendency to accept an H⁺ ion.

$H_{2} C_{2} O_{4} {⇔ HC}_{2} {O_{4}}^{-} {+ H}^{+}$

That is the chances of removal of H⁺ ion by an oxalic acid is greater than that of HC₂O₄^- ion.

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