Question

What is function of salt bridge in voltaic cell?

Answer 1

to keep the charge in each cell neutral

Explanation:

as the atoms of your anode (source of electrons) break down and release electrons, positive ions are formed that migrate into the cell resulting in a net positive charge.

The opposite is happening at the cathode (destination fo electrons) where ions in solution are accepting electrons and fixing themselves to the surface of the electrode. The loss of positive ions in the cell results in a net negative charge.

The buildup of charges within the cells will result in negative feedback, slowing down the reaction, if not for the salt bridge. the salt bridge permits negative charged ions in the cathode cells to flow to the anode cell (and vice versa). The attractions of anions in the cathode cell to the positively charged anode cell keeps each cell neutrally charged and operating in an ideal manner.