Which is the conjugate base of the bicarbonate ion, HCO3-?

CO3 2-

yes

To determine the conjugate base of the bicarbonate ion, HCO3-, you need to understand the concept of conjugate acids and bases.

The bicarbonate ion, HCO3-, can act as an acid by donating a proton (H+). In this case, the proton would be removed from the hydrogen atom, resulting in the formation of the conjugate base.

To find the conjugate base, simply remove the hydrogen atom from HCO3-. By doing so, you are left with the carbonate ion, CO3 2-.

Therefore, the conjugate base of the bicarbonate ion, HCO3-, is the carbonate ion, CO3 2-.