At a normal blood pH, what is the ratio of bicarbonate to carbonic acid in the blood?

1. The bicarbonate-carbonic acid buffer system relies on a specific balance between the two forms. 2. At normal pH, bicarbonate is present in much greater amount than carbonic acid. 3. This ratio is 20:1. 4. This large excess of bicarbonate makes the system especially efficient at buffering acids, which are more common as metabolic wastes. 5. So 20:1 is correct. _Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 26 "Fluid, Electrolyte, and Acid-Base Balance", p.1265 §Bicarbonate-Carbonic Acid Buffer_