The PH of Blood Is 7

question 115

Multiple Choice

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, K_a1 = 4.2 × 10^-7.

• A) [bicarbonate]/[carbonic acid] = 0.11
• B) [bicarbonate]/[carbonic acid] = 0.38
• C) [bicarbonate]/[carbonic acid] = 2.65
• D) [bicarbonate]/[carbonic acid] = 9.4
• E) None of the above ratios is correct.

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