Though cliche, it is absolutely true that science is all around you. As both scientists and young children will tell you, the average household is filled with substances and items that can lead to exciting and fun experiments. One such item is soda. As an acidic substance, soda is mildly corrosive. Testing its corrosive effects on various items makes for excellent science projects.
Corrosion of Teeth
Because of soda's high sugar contact, many mothers warn that drinking too much soda "will rot your teeth." Testing this hypothesis requires you to establish a controlled experiment using different soda types and animal teeth. Secure materials such as sterile beakers and soda, as well as distilled water. You may need to work with a science teacher or even ask a dentist before you're able to acquire real teeth or appropriate synthetic substitutes.
Examine and describe each tooth prior to the experiment. Take notes on color, density, weigh and gloss. Set up a control by placing a tooth in distilled water in a beaker. Place equal amounts of your soda into different beakers labeled according to different durations. For example one day, one week, one month, one year, and so on. Place teeth in the soda and allow the teeth to sit in the soda for the amount of time indicated by their label. When a tooth is ready to be extracted, remove it and examine its characteristics. This will help you determine if soda does indeed "rot your teeth."
Corrosiveness by Brand
Operating under the assumption that soda is corrosive, it is necessary to determine which sodas are the most corrosive. You will require materials sterile beakers and a variety of soda brands.
Establish a control by placing the object to be corroded --- perhaps a small piece of iron or a screw --- into a beaker with distilled water. Pour equal amounts of different sodas into your beakers, drop in the objects to be corroded --- make sure they're all the same kind of object --- and establish a timeline for observation. Between the start and end date of your experiment --- for example, 45 days --- remove and examine the objects at regular intervals to gauge the degree of their corrosion.
Soda as Polish
Corrosion is not always bad thing. Occasionally the act of corrosion can have a cleaning effect on an object. In the case of tarnished metal objects such as copper or silverware, some argue that soda acts as an excellent polisher.
This hypothesis can be examined by establishing a controlled experiment whereby several tarnished objects are placed in various substances in an effort to gauge those substances corrosive polishing capabilities. For example, you could place tarnished spoons in a beaker of distilled water, a beaker of tarnish remover and a beaker of soda. After a pre-established amount of time, remove all the spoons and compare the corrosive tarnish-removing capabilities.
Corrosive Chemical Reactions
Owing to some viral videos on the Internet, the reaction of some sodas when mixed with certain breath mints has become a captivating and fun experiment that is easily duplicated. Ultimately this chemical reaction occurs because of the corrosive nature of the soda dissolves the outer shell of the mint and produces an excess of carbon dioxide. Though the most explosive and thrilling version of this experiment involves dropping mints directly into a bottle of soda, an experiment designed to discover what amount of soda is necessary to start the reaction could be conducted.
Place mints into sterile containers and add different amounts of soda to the containers using graduated cylinders. Observe and describe the reactions in each beaker in your attempts to determine exactly how much soda is required to start the optimal explosive reaction.
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