remember the chemical reactions involving a transfer a public trans unknown as red ox reaction in a bit ox reaction the substance that accept electrons the copper ions is called the oxidant the substance that donates the electrons zinc metal is called the reductant as the reaction continues the newly formed copper atoms are locked into the latest buildup on the surface at the copper trip the at the same time the sink street progressively disintegrates as it Atoms becomes lnc ions and move into the solution good but isn't there a problem want these ions create an electrical imbalance in the sink solution after all each one carries two positive changes it this is where the filter paper comes in remember it is saturated with the salt solution potassium nitrare it's known as a salt bridge and here's why it it allows on lran's to move between the solutions in the two containers and that's exactly what happens maintaining the balance