Table of Contents
Which liquid cleans pennies the best variables?
Independent variable: The different substances. In conclusion ketchup cleaned the penny the best because ketchup contains salt and vinegar. Vinegar and salt react with each other and are a very corrosive combination.
What cleans the penny the best?
Copper oxide dissolves in a mixture of weak acid and table salt-and vinegar is an acid. You could also clean your pennies with salt and lemon juice or orange juice, because those juices are acids, too.
Which juice cleans pennies best science project?
lemon juice
Those tart little lemons work to remove copper oxide because they contain citric acid. Since lemon juice has the highest concentration of citric acid of any fruit, it works the best. Other juices that rank highly include lime, grapefruit, and orange juice.
What is the independent variable for cleaning coins?
If you choose to clean a penny with a heated liquid, the penny may consequently be cleaner or less clean than if you chose to use the liquid at room temperature. The temperature is the independent variable, the consequent cleanliness is the dependent variable.
What cleans a penny science fair project?
After quite some time, or after exposure to an acid, pennies will form copper sulfate, carbonate, and chloride salts, which gives pennies a green color. Washing the pennies in a vinegar and salt solution removes the patina from the pennies, exposing the brighter copper underneath once more.
What is the independent variable in a penny experiment?
The independent variable in the experiment is the soap and the dependent variable in the experiment is the number of water drops on the surface of the penny. The control is the penny without soap.
How do you clean a penny experiment?
What You’ll Do
- Guess which liquid will make a penny shine.
- Set one penny aside.
- In one cup, pour enough vinegar to cover the penny.
- In the other cup, pour enough liquid soap to cover the penny.
- Wait at least ten minutes.
- Remove the pennies, rinse them in water, and rub them with a paper towel.
- Compare all three pennies.
Why does Coke clean a penny?
When the copper oxide (the pennies) and the phosphoric acid (the cola) get together in the bath, the acid reacts with the copper oxide on the pennies and dissolves it. That’s why the pennies get shiny.
What kind of juice or liquid cleans pennies best?
But some things that are poor cleaners like lemon juice plus salt (a mild acid), vinegar plus salt (a mild acid), and Coke & Pepsi (mild acids) will be good at removing the tarnish. 6. The acidity of the juice has a bit to do with it, but salt has a bigger effect.
Why are pennies brighter with salt and vinegar?
if salt and vinegar removes the dirty better, then the pennies will be brighter because its components have the capacity of cleaning dirtiness easier. Dependent Variable: how clean the pennies are. Independent Variable: pennies with vinegar and salt, water, lemon, and hand soap. Control Variable:
What kind of acid do you use to clean a penny?
The acids (usually vinegar – acetic acid) break the copper oxide free from the penny. As we have seen experimentally, acid alone does not clean as well as acid and salt.
What makes the inside of a penny Dirty?
The oxygen in the air and the copper in the pennies form an oxide that coats the pennies and makes them look dirty. The acids (usually vinegar – acetic acid) break the copper oxide free from the penny. As we have seen experimentally, acid alone does not clean as well as acid and salt.