Carbon dioxide is present maximally in
Bicarbonate (HCO3-) is an anion of carbonic acid in which only one of the hydrogen atoms have been removed, as in sodium bicarbonate (NaHCO3). Also called hydrogen carbonate.Ref: Ganong&;s review of medical physiology; 23ed edition, page no: 612
Dissolved form
HCO3 form
RBC's
Plasma
Respiratory system