Why can sodium carbonate pass through the stomach wall into our blood?
the bicarbonate anion is transported out of th stomach in exchange for plasma chloride by an anion transporter that is a simple antiport .This is used to maintain electroneutrality and to be sure than the equilibrium for formation of H+ from H2CO3 ( for the H+ in HCl of stomach acid ) is directed toward ionization of H2CO3 —–> H+ + HCO3^-1 by removing HCO3^-1 and using Le-Chatelier’s Principle to ensure H+ production.
