The ph of blood is 7.35. it is maintained in part by the buffer system composed of carbonic acid (h2co3) and the bicarbonate (hydrogen carbonate, hco3-) ion. what is the ratio of [bicarbonate]/[carbonic acid] at this ph? for carbonic acid, ka1 = 4.2 10-7.a) [bicarbonae]/[carbonic acid] = 0.11.b) [bicarbonate]/[carbonic acid] = 9.4.c) [bicarbonate]/[carbonic acid] = 0.38.d) none of the above ratios is correct. e) [bicarbonate]/[carbonic acid] = 2.65.

b) [bicarbonate]/[carbonic acid] = 9.4

Explanation:

The pH of a buffer system is given by the Henderson-Hasselbach equation:

Where pka = -log (Ka) = -log(4.2x10⁻⁷) = 6.38

Now we solve for [bicarbonate] / [carbonic acid]:

So the answer is b).

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