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Why are zinc sulfate and copper sulfate solutions used for the battery? Why not just plain water?

User Haynes
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Answer:

Combinations of certain metals, such as copper and zinc, will produce electrical activity when placed in special solutions called electrolytes. The two metals form the electrodes. The electrolyte creates a chemical action that causes the zinc to form positive ions and the copper to form negative ions.

Water can't be used due to copper sulfate being highly soluble in water.

User Gumowy Kaczak
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