A biochemist is studying a buffer system in blood with a pKa of 6.1. If the pH of the blood is 7.4, what is the ratio of bicarbonate (HCO3-) to carbonic acid (H2CO3)?

• A. Ratio = 10^(7.4 - 6.1) = 1.95
• B. Ratio = 10^(7.4 - 6.1) = 19.95
• C. Ratio = 10^(7.4 - 6.1) = 0.95
• D. Ratio = 10^(7.4 - 6.1) = 0.05

Answer: (B)