2. THE PHOSPHATE RULE INDICATES THE PO43- ION IS USUALLY INSOLUBLE HOWEVER Na+ IS A SOLUBLE GROUP ONE EXCEPTION.
The group one rule indicates it is soluble, all group one salts are, with no exceptions.
IS Na3(PO4) SOLUBLE IN WATER?
BOTH RULES INDICATE SOLUBILITY.

3. THERE IS NO RULE FOR Ca2+ .
IS Ca3(PO4)2 SOLUBLE IN WATER?
THE PHOSPHATE RULE INDICATES
IT IS NOT SOLUBLE.

4. MAGNESIUM HAS NO RULE, THEREFORE FOND THE ANION RULE
IS MgS SOLUBLE IN WATER?
THE SULFIDE RULE INDICATES
IT IS NOT SOLUBLE.

5. IS PbSO4 SOLUBLE IN WATER?
Pb HAS NO RULE, HOWEVER IT IS AN INSOLUBLE EXCEPTION TO MANY OF THE RULES IN THE SOULUBLE COMPOUNDS.
IS PbSO4 SOLUBLE IN WATER?
THE SULFATE RULE INDICATES Pb
IT AN INSOLUBLE EXCEPTION SOLUBLE.