## General Chemistry: Principles and Modern Applications (10th Edition)

(a) ${IO_3}^-$ (b) $C_6H_5COO^-$ (c) ${PO_4}^{3-}$ (d) $C_2H_5NH_2$
To find the conjugate base of an acid, all you need to do is remove one H atom from the formula, and subtract 1 from the charge. (Because you removed one $H^+$) Conjugate bases are the result from removing a proton from an acid.