Select the cations that, when combined with PO43-, form a water-insoluble compound. Check All That Apply

Ibelieve the answer 4 moles

The answer is ax3. hope this

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Remember that rust prevented by placing a sacrificial electrode in electrical contact with the iron. the sacrificial electrode must be composed of a metal that  oxidizes  more easily than iron (that is, it must be below iron in table 18.1).