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• As a byproduct of cellular metabolism,${\mathrm{CO}}_2$is constantly created in our cells.
• The bulk of ${\mathrm{CO}}_2$carried to the lungs for elimination, while the rest dissolves in bodily excretions such as plasma and saliva, producing carbonic acid.

• Bicarbonate is formed when carbonic acid dissociates.${\mathrm{HCO}}_3^{-}$and ${\mathrm{H}}_3{\mathrm{O}}^{+}$are two examples of this. .
• The kidneys supply more of the anion ${\mathrm{HCO}}_3^{-}$,resulting in an essential buffer system in the bodily fluid - the ${\mathrm{H}}_2{\mathrm{CO}}_3/{\mathrm{HCO}}_3^{-}$buffer.

${\mathrm{CO}}_2\left(g\right)+{\mathrm{H}}_2\mathrm{O}\left(l\right)↔{\mathrm{H}}_2{\mathrm{CO}}_3\left(\mathrm{aq}\right)↔{\mathrm{H}}_3{\mathrm{O}}^{+}\left(aq\right)+{\mathrm{HCO}}_3^{-}\left(aq\right)$

• Excess ${\mathrm{HCO}}_3^{-}$mixes with ${\mathrm{HCO}}_3^{-}$carbonic acid, while excess - - reacts with biological fluids.

${\mathrm{H}}_2{\mathrm{CO}}_3\left(aq\right)+{\mathrm{OH}}^{-}\left(aq\right)→{\mathrm{H}}_2\mathrm{O}\left(l\right)+{\mathrm{HCO}}_3{}^{-}(aq)$

• Carbonic acid content in the body is directly related to the partial pressure of ${\mathrm{CO}}_2$
  

• When you breathe quickly, our body's ${\mathrm{CO}}_2$level drops, and our $\left[{\mathrm{H}}_2{\mathrm{CO}}_3\right]$, The balance alters to produce less ${\mathrm{H}}_3{\mathrm{O}}^{+}$, resulting in a pH rise.

$\mathrm{pH}=-\log \left[{\mathrm{H}}_3{\mathrm{O}}^{+}\right]$

${\mathrm{H}}_3{\mathrm{O}}^{+}?\mathrm{pH}?$

• As a result, the concentration of the${\mathrm{H}}_3{\mathrm{O}}^{+}$decreases ,$\mathrm{pH}$is also increases.