Final answer:
The common name for the HCO3- ion is bicarbonate.
Step-by-step explanation:
The common name for the HCO3- ion is bicarbonate.
When naming acids as ionic compounds, the name of the cation element (in this case, hydrogen) is followed by the name of the anion without the -ion ending. In this case, the anion is carbonate, so the name becomes hydrogen carbonate. This is commonly referred to as bicarbonate.
Other examples of common polyatomic ions include hydroxide (OH-), hypochlorite (ClO-), and dihydrogen phosphate (H2PO4-).