UNESCO - United Nations Educational, Scientific and Cultural Organization IUPAC - International Union of Pure and Applied Chemistry

Partners for the International Year of Chemistry 2011


Alison Jordan

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Bullis Participates in the IYC Experiments - G Block 10th Gr. Chemistry


  • The goal of the IYC experiments was to eliminate germs in drinking water and provide awareness of cleaner drinking water around the world. Our class used these experiments to learn about clarification of water and also raise awareness.


  • For the first experiment, our class had accurate results, and the pH of all the different water we tested was approximately 7.6 for marine water and 7.4 for fresh water. A few groups added too many drops of bromo blue, giving them inaccurate data. We learned you have to be precise when conducting these experiments to get good results. Our percent deviation was low, so the data was good because we had 2.1% and that is well below 5%.


  • For our second experiment, the average of our classes absolute salinity is 25.80. A problem we ran into was that we dried it in humid air, and some also started to boil over and lose salt because the heat on the hot plate was to high.


  • For Lab 3 Water: No Dirt, No Germs, we used the five steps of clarification to reach the ultimate goal of purification. The two procedures we used were water clarification and water disinfection. For Water Clarification we first observed the initial appearance, which was foggy and smelled bad. After the first step of clarification (aeration), it looked yellowish and smelled bad. We then added alum after 15 minutes and the water started to smell cleaner and the sediment mostly disappeared. After filtration the water smelled clean and the sediment was mostly gone. Throughout this lab we collaborated with different sections of the chemistry classes. After we did the procedure of water disinfection, we learned that recently cleared water is not safe to drink because it still contains bacteria, but after titrating with bleach it’s safe because bleach kills the bacteria.


  • In Lab 4: Solar Still Challenge, we taught eighth graders the procedures of this lab. We also made a video teaching them the steps, so they can construct the experiment visually.

In conclusion to our lab, we are happy we could participate in this global project and the future of clean water!!

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