Carbon dioxide (CO₂) is readily soluble in water, according to the equation CO₂ + H₂O ↔ H2CO3. Carbonic acid (H2CO3) is a weak acid. Respiring cells release CO₂ into the bloodstream. What will be the effect on the pH of blood as that blood first comes in contact with respiring cells?

Question

Quizplus · Accepted Answer

As respiring cells release CO₂, it diffuses into the bloodstream and reacts with water to form carbonic acid (H2CO3), which is a weak acid. This reaction releases hydrogen ions (H+) into the blood, thus decreasing the blood pH slightly. Therefore, the best answer is A, blood pH will decrease slightly.

Carbon Dioxide (CO₂) Is Readily Soluble in Water, According to the Equation