Question

why we write Hydrogen carbonate as HCO3- instead of H2CO3 ​

Answer 1

Answer:

CO2 and water form carbonic acid or H2CO3, which is in equilibrium with bicarbonate (HCO3-)and hydrogen ions (H+). ... For example, an increase in CO2 will result in increased carbonic acid formation (H2CO3) which leads to an increase in both HCO3- and H+ (\pH).