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

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 pH of blood as that blood first comes in contact with respiring cells?

A) Blood pH will decrease slightly.
B) Blood pH will increase slightly.
C) Blood pH will remain unchanged.
D) Blood pH will first increase, then decrease as CO₂ combines with hemoglobin.
E) Blood pH will first decrease, then increase sharply as CO₂ combines with hemoglobin.

Correct Answer:

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