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Chemistry

Naked Egg

by McKenzie



Why I Chose This Topic

 I chose this topic because it is a very broad topic. Acid-base reactions play an important role in everyday life. From digesting food to neutralizing acidic soil. I also thought that it would be interesting to see the egg without the hard shell and also it could be an opportunity to learn more about the parts of the egg and be a good 4-H project board. I hope to learn more about this so that it may help me in my chemistry class in the future.   
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Science Concept 

Reactions involving acids and bases can be described through the transfer of protons. Acids and bases are measured in the pH scale- the concentration of hydrogen ions in a solution. Neutralization is the process in which reactions between acids and bases move the pH to the number seven.  This is a useful process in everyday life from the treatment of acid in the digestive system to the treating of acidic soil by adding lime. When acid is neutralized it’s pH increases toward seven.  

Acids often have a sharp odor and are sour in taste. While bases often have a bitter taste. Acids in everyday life can include vinegar which contains acetic acid, lemon juice contains citric acid, vitamin C also known as ascorbic acid, fizzy drinks which contain carbonic acid, stomach acid which contains hydrochloric acid, and car battery acid which contains sulphuric acid. 

Some bases in everyday life include baking soda, sugar, soaps and bath products, alkaline batteries, lubricating grease, laundry detergent, and drain cleaners. 

The reaction between the egg shell and the vinegar is an acid base reaction. The vinegar which is the acid breaks apart the solid calcium carbonate in the eggshell which is the base. Which creates carbon dioxide gas.  An egg has two layers: the hard outer shell and the thin soft inner membrane. Called the semipermeable membrane. The vinegar breaks away the hard outer shell and all that is left is the semipermeable membrane.


In 1887 a chemist named Svante Arrhenius came up with a way to define acids and bases. He saw that when you put some substances into water, they break down and release a hydrogen ion. At other times they released a hydroxide ion. When the hydrogen ion is released, the solution is acidic. When the hydroxide ion is released, the solution is basic. These two special ions determine whether the compound your looking at is acidic or basic. 


Application

Acids and Bases are important in Chemistry. Acids and bases can be used in baking, they are used in our bodies to maintain a good digestive system, determining whether a lake can support aquatic life or not, and so much more. 

The roles of acids and bases can be seen in many different things. In the rise of cake while baking when carbon dioxide is produced in the chemical reaction between the acid, heat, and baking soda. Calcium oxide can be used to neutralize soil, and antacids are bases taken to neutralize an excessive amount of acid in the stomach. 


Uses for acids include, cleaning metals, in the maintenance of swimming pools, household cleaning, car batteries, in the manufacturing of fertilizers, explosives and the extraction of gold. 


Uses for bases include drain cleaner, lubricating grease, detergent, baking soda, baking powder, soaps, toothpaste, mouth wash, chewing gum, hair dye, and pesticides.      


Acids are used in car batteries by being responsible for producing electrolytes. Electrolytes are composed of water and sulfuric acid, they create the right environment for the electrical currents in a battery. Strong acids, such as Glycolic-based acid formulations can be used to remove rust and help clean metals. Acids are put in household cleaners to dissolve hard water deposits and eliminate soap film from around sinks and showers. 


Weak alkali is put into toothpaste to neutralize acidity in the mouth and prevent cavities. There is a specific base in chewing gum that makes it rubbery.  Bases are used in soap manufacturing, they are used to break up fat and oil to make glycerin and soap. Many mouthwashes can be made too acidic and can break down tooth enamel so to neutralize acids in the mouthwash bases are added.


As you can see, bases and acids are a very important part of society. Whether they are used together or separate for different purposes. They can be used for all these purposes and so much more! 

Famous Scientist 

The first scientist to work with acids and bases is Antoine Lavoisier. He believed that perhaps the first characteristic that makes an acid was the presence of oxygen. He named these oxien-genic from the ancient Greek word for acids which seemed to connect them to oxygen. English chemist Humphry Davy seemed to prove that this theory could not be true since many acids did not contain oxygen. He was also the first to suggest that laughing gas ( nitrous oxide) could be used for minor surgeries. 

Career Path

Acid-Based reactions can be used in cleaning and refining metals, in the maintenance of swimming pools, for household cleaning, used to neutralize soils, manufacture explosives, and in the extraction of gold.  

Farmers and gardeners add bases such as Lime (calcium oxide) to neutralize acidic soil, Nitric acid is used in reactions with toluene and glycerol separately to make TNT. Acids are used in household cleaning items to remove mineral deposits, rust stains, and hard water deposits. Bases are used in household cleaners to break down oily and fatty substances. To decrease or increase the PH levels of a pool the maintenance worker will either add acids or bases. Finally acids are used to break gold from other chemical bonds. 
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