Diana from Hawaii writes:

Hi! I’m a student from maui high school. I’m having a research for my Chemistry class and my topic is about water treatment. I’m just wondering if you can give me some facts abput it and i also need to do a poster and I’m not really sure what to do.. pls give me ideas/facts.

Thank you for your question!

If your topic is about water treatment and it’s for chemistry class, perhaps you can do your topic on chlorine.  Chlorine is the most common water treatment chemical in use today.

Here are some ideas for you. Click on the points to be taken to another website with some information. This is just a starting point, you may want to do some further research on your own.

• The history of chlorine, why it was first used and where.
• The types of chlorine used: Anhydrous Chlorine (Cl2), liquid sodium hypochlorite, dry calcium hypochlorite
• What happens when you add chlorine to water: The disassociation process between hypochlorus acid (HOCl) and the hypochlorite ion (OCl-), and include the pH Disassociation curve
• The difference between the states of chlorine: Free, combined, and total
• Breakpoint chlorination: what happens when you add chlorine to water.  Google breakpoint chlorination and you’ll find LOTS of good stuff.
• The difference between primary and secondary chlorination.

I hope I’ve given you a good idea, and get busy googling!  Let me know if you need any further help or ideas.  And I will email you when your answer is up on the site if you would like to refer to it more.

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