Voltaic cell

Let us learn about Voltaic cell

it is a device used to convert the chemical energy produced in a redox reaction into electrical energy.

A voltaic cell is created whenever dissimilar metals, connected in some way, are immersed in a conductive fluid.

A voltaic cell is a device made from connecting two different metals together and immersing the combined piece into some sort of fluid that creates a conductive atmosphere

Let us learn how to make Voltaic cell

The general purpose of a voltaic cell is to convert the chemical reaction between the metals and the fluid into an electrical charge. One of the most common examples is simply a battery, used to supply electrical power to devices not connected to a central grid power source.

An electrochemical cell which causes external electric current flow can be created using any two different metals since metals differ in their tendency to lose electrons. Zinc more readily loses electrons than copper, so placing zinc and copper metal in solutions of their salts can cause electrons to flow through an external wire which leads from the zinc to the copper

As a zinc atom provides the electrons, it becomes a positive ion and goes into aqueous solution, decreasing the mass of the zinc electrode. On the copper side, the two electrons received allow it to convert a copper ion from solution into an uncharged copper atom which deposits on the copper electrode, increasing its mass. The two reactions are typically written

Zn(s) -> Zn²⁺(aq) + 2e^-

Cu²⁺(aq) + 2e^- -> Cu(s)

The letters in parentheses are just reminders that the zinc goes from a solid (s) into a water solution (aq) and vice versa for the copper. It is typical in the language of electrochemistry to refer to these two processes as "half-reactions" which occur at the two electrodes.