Question

Enter your answer in the provided box. the ph of a bicarbonate-carbonic acid buffer is 7.06. calculate the ratio of the concentration of carbonic acid (h2co3) to that of the bicarbonate ion (hco3−). (ka1 of carbonic acid is 4.2 × 10−7.)

Answer 1

The ratio would be 12.6 of carbon acid

Answer 2

The ratio of the concentration of carbonic acid to that of the bicarbonate ion in a buffer with a pH of 7.06 is 0.22.

We have a buffer system of bicarbonate-carbonic acid with a pH of 7.06.

What is a buffer system?

A buffer system is a solution that resists change in pH when acids or bases are added to it.

How is a buffer system formed?

In can 2 formed in 1 of 2 ways:

• A weak acid and its conjugate base.
• A weak base and its conjugate acid.

We have a buffer system formed by a weak acid (H₂CO₃) and its conjugate base (HCO₃⁻). We can calculate the ratio of [H₂CO₃]/[HCO₃⁻] using the Henderson-Hasselbach's equation.

pH = pKa + log ([HCO₃⁻]/[H₂CO₃])

7.06 = (-log 4.2 × 10⁻⁷) + log ([HCO₃⁻]/[H₂CO₃])

0.66 = log ([HCO₃⁻]/[H₂CO₃])

[H₂CO₃]/[HCO₃⁻] = 0.22

The ratio of the concentration of carbonic acid to that of the bicarbonate ion in a buffer with a pH of 7.06 is 0.22.

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