Na+ and Cl- ___ Na+ and PO4 3- _ Na+ and SO4 2- _ Na+ and CO3 2- _ K+ and Cl- _ K+ and PO4 3- _ K+ and SO4 2- _ K+ and CO3 2- _ Ca2+and Cl- _ Ca2+ and PO4 3- _ Ca2+ and SO4 2- _ Ca2+ and CO3 2- _ NH4 + and Cl- _ NH4 + and PO4 3- _ NH4 + and SO4 2- _ NH4 + and CO3 2- _ Fe3+ and Cl- _ Fe3+ and PO4 3- _ Fe3+ and SO4 2- _______________ Fe3+ and CO3 2-

For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.

The cations and anions being oppositely charged attract each other through strong coloumbic forces and form an ionic bond.

(1) Sodium is carrying +1 charge called as [tex]Na^{+1}[/tex] cation and chloride [tex]Cl^{-1}[/tex] is an anion carrying -1 charge. Thus they combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral [tex]NaCl[/tex].

(2) Sodium is carrying +1 charge called as [tex]Na^{+1}[/tex] cation and phosphate [tex]PO_4^{-3}[/tex] is an anion carrying -3 charge. Thus they combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral [tex]Na_3PO_4[/tex].

(3) Sodium is carrying +1 charge called as [tex]Na^{+1}[/tex] cation and sulfate [tex]SO_4^{-2}[/tex] is an anion carrying -2 charge. Thus they combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral [tex]Na_2SO_4[/tex].

(4) Sodium is carrying +1 charge called as [tex]Na^{+1}[/tex] cation and carbonate [tex]CO_3^{-2}[/tex] is an anion carrying -2 charge. Thus they combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral [tex]Na_2CO_3[/tex].

(5) Potassium is carrying +1 charge called as [tex]K^{+1}[/tex] cation and chloride [tex]Cl^{-1}[/tex] is an anion carrying -1 charge. They form [tex]KCl[/tex].

(6) Potassium is carrying +1 charge called as [tex]K^{+1}[/tex] cation and phosphate [tex]PO_4^{-3}[/tex] is an anion carrying -3 charge. They form [tex]K_3PO_4[/tex].

(7) Potassium is carrying +1 charge called as [tex]K^{+1}[/tex] cation and sulfate [tex]SO_4^{-2}[/tex] is an anion carrying -2 charge. They form [tex]K_2SO_4[/tex].

(8) Potassium is carrying +1 charge called as [tex]K^{+1}[/tex] cation and carbonate [tex]CO_3^{-2}[/tex] is an anion carrying -2 charge. They form [tex]K_2CO_3[/tex].

(9) Calcium is carrying +2 charge called as [tex]Ca^{+2}[/tex] cation and chloride [tex]Cl^{-1}[/tex] is an anion carrying -1 charge. They form [tex]CaCl_2[/tex].

(10) Calcium is carrying +2 charge called as [tex]Ca^{+2}[/tex] cation and phosphate [tex]PO_4^{-3}[/tex] is an anion carrying -3 charge. They form [tex]Ca_3(PO_4)_2[/tex].

(11) Calcium is carrying +2 charge called as [tex]Ca^{+2}[/tex] cation and sulfate [tex]SO_4^{-2}[/tex] is an anion carrying -2 charge. They form [tex]CaSO_4[/tex].

(12) Calcium is carrying +2 charge called as [tex]Ca^{+2}[/tex] cation and carbonate [tex]CO_3^{-2}[/tex] is an anion carrying -2 charge. They form [tex]CaCO_3[/tex].

(13) Ammonium ion is carrying +1 charge called as [tex]NH_4^{+1}[/tex] cation and chloride [tex]Cl^{-1}[/tex] is an anion carrying -1 charge. They form [tex]NH_4Cl[/tex].

(14) Ammonium ion is carrying +1 charge called as [tex]NH_4^{+1}[/tex] cation and phosphate [tex]PO_4^{-3}[/tex] is an anion carrying -3 charge. They form [tex]NH_4_3PO_4[/tex].

(15) Ammonium ion is carrying +1 charge called as [tex]NH_4^{+1}[/tex] cation and sulfate [tex]SO_4^{-2}[/tex] is an anion carrying -2 charge. They form [tex]NH_4_2SO_4[/tex].

(16) Ammonium ion is carrying +1 charge called as [tex]NH_4^{+1}[/tex] cation and carbonate [tex]CO_3^{-2}[/tex] is an anion carrying -2 charge. They form [tex]NH_4_2CO_3[/tex].

(17) Iron is carrying +3 charge called as [tex]Fe^{+3}[/tex] cation and chloride [tex]Cl^{-1}[/tex] is an anion carrying -1 charge. They form [tex]FeCl_3[/tex].

(18) Iron is carrying +3 charge called as [tex]Fe^{+3}[/tex] cation and phosphate [tex]PO_4^{-3}[/tex] is an anion carrying -3 charge. They form [tex]FePO_4[/tex].

(19) Iron is carrying +3 charge called as [tex]Fe^{+3}[/tex] cation and sulfate [tex]SO_4^{-2}[/tex] is an anion carrying -2 charge. They form [tex]Fe_2(SO_4)_3[/tex].

(20) Iron is carrying +3 charge called as [tex]Fe^{+3}[/tex] cation and carbonate [tex]CO_3^{-2}[/tex] is an anion carrying -2 charge. They form [tex]Fe_2(CO_3)_3[/tex].