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15 September, 06:38

The diprotic acid h2co3 can produce two buffers depending on the ph of the solution. identify the conjugate acid/base pair from carbonic acid that would form the most basic buffer.

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Answers (2)
  1. 15 September, 07:25
    0
    Considering the answers;

    a) CO₃²⁻ and OH⁻

    b) CO₃ and CO₃²⁻

    c) H₂CO₃ and CO₂⁻³

    d) H⁺ and H₂CO₃

    e) H₂CO₃ and HCO₃⁻

    The correct answer is e) H₂CO₃ and HCO₃⁻; however, the HCO₃⁻ and CO₃²⁻ pair would be more basic than the carbonic / bicarbonate pair. A buffer is a mixture of a conjugate acid-base pair that can resist changes in pH upon addition of an acid or a base. Carbonic acid is formed when carbon dioxide is dissolved in water; Bicarbonate buffer system consists of carbonic acid, a weak acid, and the bicarbonate anion, its conjugate base.
  2. 15 September, 09:58
    0
    These are the choices for this question:

    a) CO ₃²⁻ and OH ⁻

    b) CO ₃ and CO ₃²⁻

    c) H ₂ CO ₃ and CO ₂⁻³

    d) H ⁺ and H ₂ CO ₃

    e) H ₂ CO ₃ and HCO ₃⁻

    This is the best answer for the choices given is e) but the HCO ₃⁻ and CO ₃²⁻ pair would be more basic than the carbonic / bicarbonate pair.
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