By: Sarah Stallings CORROSION!
Feb 24, 2016
By: Sarah StallingsCORROSION!
PROBLEM
Out of Rubbing Alcohol, Peroxide, Lemon Juice, and Vinegar what cleans corroded pennies the best?
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.
INTRODUCTION
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.
BACKGROUND INFORMATION
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.
HYPOTHESIS
20 corroded penniesRubbing AlcoholPeroxideVinegarLemon Juice4 containersTimerTooth brush (to scrub pennies)PenPaper
MATERIALS
1. Gather all materials needed2. Measure ½ cup of Lemon Juice, Vinegar, Alcohol,
Peroxide3. Pour each liquid into 4 small containers4. Put 5 corroded pennies in each container5. Put lid on and shake for 10 seconds6. Set timer for an hour7. Once timer rings scrub each penny thoroughly8. Set back in liquid9. Set timer for an hour10. Pour liquid out and wipe off with paper towel
PROCEDURE
½ cup of each liquidShaking for 10 secondsA set timeWiping off penniesLiquids in same room temperature
CONTROLLED VARIABLE
Rubbing AlcoholPeroxideLemon juiceVinegar
INDEPENDENT VARIABLES
Condition of BrushShineResidue on paper towelResidue in liquid
DEPENDENT VARIABLE
ALCOHOL
Condition of Brush:
Shine: Residue on paper towel:
Residue in liquid:
Before: Clean 1 out of 55 being really shiny
None None
After: 2 out of 55 being really dirty
2 out of 5 Very little dirt
None
LEMON JUICE
Condition of Brush:
Shine: Residue on paper towel:
Residue in liquid:
Before: Clean 1 out of 55 being really shiny
None None
After: 4 out of 5Black5 being really dirty
4 out of 5 Dirty but not very dirty
Little pieces of dirt
PEROXIDE
Condition of Brush:
Shine: Residue on paper towel:
Residue in liquid:
Before: Clean 1 out of 55 being really shiny
None None
After: 3 out of 5Yellow5 being really dirty
2 out of 5 None Very little residue
VINEGAR
Condition of Brush:
Shine: Residue on paper towel:
Residue in liquid:
Before: Clean 1 out of 55 being really shiny
None None
After: 5 out of 55 being really dirty
2 out of 5 Dirty but not very dirty
Very little dirt
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.
CONCLUSION
Peroxide looked like it was cleaning best because there were bubbles surrounding the pennies.
MAJOR OBSERVATION
I used the same liquid measuring glass to measure out each liquid.
I used different types of containers
POSSIBLE CAUSES OF ERROR
I spent about 18 to20 hours on my project.
TIME SPENT
Mrs. RiffelParentsTanner
ACKNOWLEDGEMENTS
"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>.
WORKS CITED