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This question already has an answer here:

Why is zinc sulfate needed in the construction of a daniell cell. It seems that because the zinc is getting oxidized and not reduced there is no need to have a solution of zinc sulfate as it will produced when the zinc is reduced. The sulfate ions would simply cross the salt bridge and balance out the charges.

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marked as duplicate by user15489, Todd Minehardt, bon, Loong, ron Sep 1 '15 at 21:29

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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Zinc sulfate is not needed. With any other neutral salt in its place, your cell will work just fine.

Without any salt at all, though, it will not work, since pure water is a poor conductor of electric current.

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    $\begingroup$ This does not provide an answer to the question. To critique or request clarification from an author, leave a comment below their post. $\endgroup$ – Todd Minehardt Sep 1 '15 at 20:42
  • $\begingroup$ I do not actually see how I could provide an answer (in the strict sense) to the question, when the question itself relies on a wrong presumption. Why does a cat bark, really? $\endgroup$ – Ivan Neretin Sep 1 '15 at 20:47
  • $\begingroup$ If you have doubts about the premise of the question, it is better to ask for clarification in a comment. $\endgroup$ – user15489 Sep 1 '15 at 21:16
  • $\begingroup$ I do have doubts about many other questions, but this one is crystal clear. Also, if we clarify it, wouldn't the question vanish into nothing? Anyway, I'll follow your advice the next time. $\endgroup$ – Ivan Neretin Sep 1 '15 at 21:33

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