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The effect of water salinity on electrolysisFeatured science projectScience project video


The hypothesis that  sea water with a higher salinity will conduct more electricity is proven to be true. The presence of salt in seawater  makes it a good conductor.

Electrolysis process can be used to store energy and reproduce it for later use. Examples are the rechargeable and disposable batteries and batteries used to start cars. Currently environment friendly energy sources like solar panels and wind turbines make use of batteries to store the energy that they produce for later use.

Also consider

The experiment can also be done by varying the amount of salt in the water.

This experiment can also be repeated to observe the effect of different sizes and types of electrodes.


Electrolysis -

Electrolysis -     

Electrolysis -

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Complexity level:
Project cost ($):
Time required:
1 hour to prepare, 1 hour for experiment
Material availability:
May be purchased from a hobby store, or alternatively obtained from a school science laboratory
Safety concerns:

1. Use only batteries. NEVER connect to a mains supply.
2. Conduct the experiment under supervision of a qualified person (science teacher). Flammable gasses may be released.
3. Electrolysis of sea water may produce chlorine gas. Take necessary precaution. Ensure that the experiment is conducted in a well-ventilated laboratory