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Conclusion

The hypothesis that a higher DC voltage applied to the electrolysis process will increase the rate at which the hydrogen gas is produced has been proven to be true.

The second hypothesis, that the rate of production of hydrogen gas will increase as the concentration of salt increases, is not proven to be true.

Electroplating is an industrial process which  is used to produce a coating on metal surfaces. Electrolysis  is also used in measuring devices such as the pH meter, while astronauts produce oxygen in space through the electrolysis.
 

Also consider

This science fair project may also be repeated by using different types of electrolytes such as vinegar or sulfuric acid.

Also, examine the effects of raising or lowering the temperature of the solution during the process of electrolysis.
 

References

Electrolysis - http://en.wikipedia.org/wiki/Electrolysis

Electrolysis - http://www.tutorvista.com/content/chemistry/chemistry-iii/redox-reactions/electrolysis.php
 

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Complexity level:
7
Project cost ($):
20
Time required:
1 hour to prepare, 1 hour for this science fair project
Material availability:
Easily available at a hobby store
Safety concerns:

Use only batteries. Do not connect the wires to a mains supply.