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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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15y ago
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14y ago

CO2(g) + H2O(l) <---> H2CO3(aq) <---> H+ + HCO3-(aq) <---> 2H+ + CO32-(aq).

As the above reactions indicate, when carbon dioxide dissolves in water or an aqueous solution, it forms carbonic acid which dissociates to release protons. This directly increases the amount of dissolved hydronium and decreases the pH. The dissociation constants are not overly high, but they are enough to affect the pH of blood.

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12y ago

yes because an acid is below 7 and an alkali is above 7

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6y ago

The pH decrease because carbonic acid is formed.

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12y ago

hydrogen ion concentration decreases

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7y ago

The acidity increase.

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Q: When pH decreases does hydrogen ion concentration increase or decrease?
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What does an increase pH of 1 represent?

A decrease in hydrogen ion concentration by factor of 10


What does an increase of 1 number represent?

A decrease in hydrogen ion concentration by factor of 10


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