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Ions are always dissolved in their solution. Anything that has charge is an ion. If phosphate ions are present in a solution it is because they came from a soluble parent molecule such as phosphoric acid.


Can the Volta Battery use a different ionic solution? Yes you can use any soluble salt as long as it does not react with electrodes, and certainly such a battery would be able to produce current. My chemistry high school teacher had a clock which ran on salt water. See for example,

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