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Corrosion!

Corrosion!. By: Sarah Stallings. Problem. Out of Rubbing Alcohol, Peroxide, Lemon Juice, and Vinegar what cleans corroded pennies the best?. Introduction.

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Corrosion!

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  1. Corrosion! By: Sarah Stallings

  2. Problem Out of Rubbing Alcohol, Peroxide, Lemon Juice, and Vinegar what cleans corroded pennies the best?

  3. Introduction I have always hated seeing corroded coins, so I wanted to see what cleans them. I went through my piggy bank and found corroded pennies. Then I went online to find different opinions about cleaning corrosion.

  4. Background information • Corrosion-: Due to chemical reactions wearing away particles. Corrosion happens when a surface typically metal is exposed to a gas or liquid chemical. • Rubbing Alcohol- Used for disinfecting or to soothe the skin. 70% of rubbing alcohol is made from ethanol. It has a bitter taste and a strong smell (wise Geek). • Lemon Juice- Has the pH of 2.3 and is used to clean pennies and to write secret messages that can only be revealed by heat.

  5. Hypothesis • I think that peroxide will clean the pennies the best because it is used for disinfecting. Also I think that it will clean best because you hear it sizzling.

  6. materials • 20 corroded pennies • Rubbing Alcohol • Peroxide • Vinegar • Lemon Juice • 4 containers • Timer • Tooth brush (to scrub pennies) • Pen • Paper

  7. procedure • Gather all materials needed • Measure ½ cup of Lemon Juice, Vinegar, Alcohol, Peroxide • Pour each liquid into 4 small containers • Put 5 corroded pennies in each container • Put lid on and shake for 10 seconds • Set timer for an hour • Once timer rings scrub each penny thoroughly • Set back in liquid • Set timer for an hour • Pour liquid out and wipe off with paper towel

  8. Controlled variable • ½ cup of each liquid • Shaking for 10 seconds • A set time • Wiping off pennies • Liquids in same room temperature

  9. Independent Variables • Rubbing Alcohol • Peroxide • Lemon juice • Vinegar

  10. Dependent variable • Condition of Brush • Shine • Residue on paper towel • Residue in liquid

  11. Alcohol

  12. Lemon Juice

  13. Peroxide

  14. Vinegar

  15. Conclusion • Overall Lemon Juice cleaned the pennies the best. The pennies that went into the lemon juice were a lot cleaner. Also you could tell the difference between the before and after pictures.

  16. Major observation • Peroxide looked like it was cleaning best because there were bubbles surrounding the pennies.

  17. Possible causes of error • I used the same liquid measuring glass to measure out each liquid. • I used different types of containers

  18. Time spent • I spent about 18 to20 hours on my project.

  19. Acknowledgements • Mrs. Riffel • Parents • Tanner

  20. Works Cited "Corrosion (chemical Process)." Encyclopedia Britannica Online. Encyclopedia Britannica. Web. 18 Mar. 2012. <http://www.britannica.com/EBchecked/topic/138721/corrosion>. "Lemon Juice." Wikipedia. Wikimedia Foundation, 18 Mar. 2012. Web. 18 Mar. 2012. <http://en.wikipedia.org/wiki/Lemon_juice>. Foster, Niki, and Bronwyn Harris. "What Is Rubbing Alcohol?" WiseGeek. Conjecture. Web. 18 Mar. 2012. <http://www.wisegeek.com/what-is-rubbing-alcohol.htm>.

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