Aging and Blood Buffers
When a person drinks alkaline water which is high in alkalinity, or a cola drink which is high in acidity, the blood pH value does not seem to change much. The reason is that in blood there are two types of buffers to regulate and maintain the blood pH value to within a very narrow range of 7.38 and 7.41.
One is an acid buffer, carbonic acid (H2CO3), which is the combination of water and carbon dioxide. (H2O + CO2 = H2CO3). The other is an alkaline buffer, bicarbonate, usually potassium bicarbonate (KHCO3) or sodium bicarbonate (NaHCO3).