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En el tampón extracelular HCO3/CO2 es especialmente importante en la fisiología del equilibrio ácido-base. Este tampón se forma a partir del CO2 que reacciona con el agua para formar ácidocarbónico y H+ en la misma proporción: CO2 + H2O < ----> H + HCO3 . A través de este sistema amortiguador y de ka ecuación de Henderson-Hasselbalch es posible estimar el valor de pH en el plasma. Ácido carbonico como dador de protones y bicarbonato como aceptor de protones. La reacción general es: CO2 + H2O < ---> H + HCO3 (pKa=6.1). El ácido carbonico prácticamente no existe porque al hacer la...