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Calculate the pKa of HCO3- and the ratio of its conjugate base to acid using the Henderson-Hasselbalch equation.

Chemistry

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Step-by-step solution

2 steps
  1. Calculate the pKa\text{pK}_a from the given Ka\text{K}_a value for HCO3−\text{HCO}_3^-.

    The Ka\text{K}_a for HCO3−\text{HCO}_3^- is 4.7×10−114.7 \times 10^{-11}.

    pKa=−log⁡(Ka)\text{pK}_a = -\log(\text{K}_a) pKa=−log⁡(4.7×10−11)\text{pK}_a = -\log(4.7 \times 10^{-11}) pKa≈10.3279\text{pK}_a \approx 10.3279
  2. Use the Henderson-Hasselbalch equation to find the ratio of the conjugate base

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