Blood pH is controlled by concenrration of H2CO3 and HCO3−. In the presence of NaHCO3, pH of blood is

Acidic buffer solution is prepared by mixing a weak acid and its salt with a strong base.Thus, a mixture of H2​CO3​ and HCO3-​ acts as an acidic buffer solution.The expression for the pH of the acidic buffer solution is as given below:pH=pKa+log [salt][Acid] ​  In the presence of NaHCO3​, the concentration of salt increases. Hence, the term log[salt]​/[Acid] increases. This increases the pH of blood.