Electrolysis of Water Without a Hoffman Apparatus

What is the effect of voltage on the rate of electrolysis?
Introduction:

Hoffman Apparatus shown on the right is normally used for water electrolysis. Hydrogen and oxygen gases formed in tubes can easily be measured because both tubes are graduated.  

Water analysis can also be performed with less complex devices that you can assemble at home or at your school lab.  

You perform a water analysis experiment to find the answer to any of the following questions: What gas will be produced in an anode? What gas will be produced in a cathode? What is the ratio of produced gases? How do ionic compounds help the electrolysis of water? How does electrolysis of water affect the pH of water in or around electrodes?
 
 Project description:
In this project you will design and perform a simple water electrolysis using the material that you can find at home or obtain locally. You will then analyze the results and draw a conclusion for each of the questions proposed above. This is a chemistry project in which you will need some chemicals, test tubes and beakers. Please make sure you can obtain such chemicals before choosing this project. Also consult with your teacher to make sure it is acceptable as your project. Chemicals you need are small amounts of Magnesium Sulfate, Sodium Hydroxide, Hydrochloric Acid, and pH indicator paper.
 Details of this project:
More details or support for this project is available for the members of ScienceProject.com web site. Material needed for experiments may be available locally or purchased online at MiniScience.com.