I suppose that you think to this reaction:
Fe(s) + CuSO4(aq) = Cu(s) + FeSO4
Copper is displaced by iron and deposited on the nail.
An acid drop is an old-fashioned sour boiled sweet.
Operation Acid Drop happened in 1941.
By staying clean
Because when you drop water into acid the acid is too concentrated so it has to let out a reaction to drop the concentration.
Acid -- also -- Out, as in "Turn on, tune in, drop out."
You don't.
cold water
Limestone!
An acid rain drop is less dense and is more meniscy
A drop of acid will make it fizz.
acid reaction