+2 -1
1. FeCl2 Fe: +2 ; Cl = -1
+1 +4 -2
2. H2CO3 H: +1 C: +4 O: -2
+3 -2+1
3. Al(OH)3 Al: +3 O: -2 H: +1
+1 +5 -2
4. Na3PO4 Na: +1 P: +5 O: -2
+2+6-2
5. CaSO4 Ca: +2 S: +6 O: -2
+2 +4 -2
6. Ca2SO4 Ca: +2 S: +4 O: -2
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+2 -1
1. FeCl2 Fe: +2 ; Cl = -1
+1 +4 -2
2. H2CO3 H: +1 C: +4 O: -2
+3 -2+1
3. Al(OH)3 Al: +3 O: -2 H: +1
+1 +5 -2
4. Na3PO4 Na: +1 P: +5 O: -2
+2+6-2
5. CaSO4 Ca: +2 S: +6 O: -2
+2 +4 -2
6. Ca2SO4 Ca: +2 S: +4 O: -2