Project cost ($):
It will take an hour to set up the science experiment, and an hour to conduct it
Easily found at a hobby store.
Use only batteries. Do not connect to mains supply. Conduct the experiment under supervision of a qualified person. Highly flammable gasses will be released. Ensure that protective gear is worn at all times.
Table of Contents
This science fair project was performed to investigate the relationship between the DC voltage applied to an electrolyte and the rate of hydrogen gas produced during the process of electrolysis.
Increasing the DC voltage applied to an electrolyte solution will increase the rate of release of hydrogen gas.
Electrolysis, electrolyte, ions, cations, anions, electrodes, anode, cathode
The materials required for this science fair project:
1. For this science fair project, the independent variables are the number of batteries used (ie: the DC voltage applied to the electrolyte). The dependent variable is the time taken to collect the released hydrogen gas. This is measured by using the stopwatch. The constants (control variables) are the amount of the salt content in the electrolyte solution, the amount of oxygen collected in the test tube and the surface area of exposed copper in the electrolyte solution.
4. Draw a line using the permanent marker pen along the circumference of the test tube. The line should be placed at about the center of the test tube. Fill the 2 test tubes with water and place them inverted, inside the beaker as shown in Figure1. The exposed copper wire should be placed entirely within the test tube.
The results show that increasing the number of batteries ( DC voltage) will result a faster rate of release of gasses.
The chart below represents the results of our science experiment
Our hypothesis has been proven to be true. Increasing the DC voltage applied to the electrolyte solution will speed up the release of hydrogen gas.
This science fair project can be repeated by varying the amount of salt in the water.
Electrolysis - http://en.wikipedia.org/wiki/Electrolysis