Name the following compounds: (a) Fe(NO_(3))_(2) (b) Na_(2)HPO_(4) (c) (NH_(4))_(2)SO_(3)

(a) $Fe(NO_{3})_{2}$: This compound is named Iron(II) nitrate. It consists of the iron cation with a +2 charge (Fe^2+) and the nitrate anion (NO_3^-). The Roman numeral (II) indicates the oxidation state of the iron cation.<br /><br />(b) $Na_{2}HPO_{4}$: This compound is named Sodium hydrogen phosphate. It consists of two sodium cations (Na^+) and one hydrogen phosphate anion (HPO_4^2-). The hydrogen phosphate anion is derived from phosphoric acid (H_3PO_4) by the loss of two protons (H^+).<br /><br />(c) $(NH_{4})_{2}SO_{3}$: This compound is named Ammonium sulfite. It consists of two ammonium cations (NH_4^+) and one sulfite anion (SO_3^2-). The ammonium cation is a common polyatomic ion, and the sulfite anion is derived from sulfuric acid (H_2SO_3) by the loss of two protons (H^+).