has anyone done the lab with an iron nail, filter papeer and copper sulfate, adding the NaCl and water?

I was wondering what is the NaCl doing in the lab?

 

This is urgent, thank you

!

Moderator Note

You have been given plenty of direction in your other thread on this topic (to the point where you could probably Google the answer) and besides, we don't allow members to have multiple on the same thing. Thread closed.