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Consider two acids: (ch3)3cco2h (pivalic acid, pka = 5.0) and hco2h (formic acid, pka = 3.8). Which acid forms the stronger conjugate base? Select the single best answer.

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Answer:

  • Pivalic acid forms a strong conjugate base.

Explanation:

  • Strong acid has weak conjugate base
  • Weak acid has strong conjugate base

As in this case, pivalic acid is weak acid (Due to electron donating effect of tert. butyl group) having pka value of 5.0 , so its conjugate base will be strong as compare to formic acid which is stronger acid.

Summary:

  • As pivalic acid is weak acid as compare to formic acid, so its conjugate base will be strong and vice versa.

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