EXPERIMENT 

What Happens When You Dip A Battery Into A Salt Water Solution?

Explanation of the video

What happens if you put a battery in Salt water? 

Well, if you have pure water, not much Change is observed .  The water molecule is electrically neutral, so it is not drawn to either terminal.  But if you mix some salt in the water, things are different.  Salt dissolves in water to leave behind positively-charged sodium ions and negatively-charged chlorine ions.  Once you put a battery in the water, the sodium ions migrate toward the “negative terminal ” and the chlorine ions migrate toward the “positive terminal ”.At the positive tank, the chlorine ions get neutralized.  The chlorine ion Cl^- has an extra electron, and this electron gets ripped off and pulled into the positive tank.  The resulting neutral chlorine atoms then bond together (since they are more stable together) to form Cl₂, which is chlorine gas. 

At the negative terminal, something a little more complicated happens.  The electrons want to jump out of the tank, but they are more easily accepted by the water molecules than by the sodium ion.  As a result, the electrons jump to water molecules, which then become unstable and split apart.   The result is that each water molecule is split into one H⁺ and one OH^-.  Hydrogen atoms, like chlorine atoms, are more stable together, so two hydrogen get together and form H₂ gas.  The OH^- goes on to bond with the iron on the battery leads (generally making the water dirty-looking).