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Decreases, because pCO2 is an acid (carbonic acid gas). On the cellular level the CO2 diffuses into the red blood cell (from periferal tissue) and is in the combination with H2O forming H+ and HCO3-:

CO2 + H2O <-> H2CO3 <-> H+ + HCO3-.

The H+ cannot diffuse out (bigger concentration cause diffusion) of the red blood cell, because its membrane is relatively impermeable to cations. However, the bicarbonate (HCO3-) can diffuse, which leaves hydrogen-ions accumulated in the blood and the pH decreases.

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