Lemon juice and iodine are easily obtained ingredients for teaching your children some basic chemistry. You can use these ingredients to conduct experiments that will teach students about acids, starches and base pH levels. Lemons and lemon juice also are useful for demonstrating how electricity can be generated using acids. Demonstrate the reaction between metals and acid by making lemon batteries and measuring the current produced.
Titration is a method of determining the concentration of substances in solutions. A simple experiment using iodine, starch and fruit juices can be performed to teach students to determine levels of Vitamin C in juices. The experiment involves adding a cornflour solution to the different juice beverages. Students will add 10 drops of starch solution to each beverage sample. Then adding iodine one drop at a time, the students record the changes that occur in the beverage. Colour change in the beverage indicates the presence of Vitamin C.
Lemon Juice Rockets
A fun and interesting way to learn about some basic chemical reaction is by making lemon juice rockets. Students use lemon juice, water, baking soda and a plastic pop bottle to demonstrate the reaction between acids and baking soda. The mixture reacts to create carbon dioxide gas. The cork stopper gets launched into the air like a rocket when the students shake the bottle to mix the lemon juice, baking soda and water.
Lemon Battery Cell
Take a lemon, a penny and a galvanised nail and you can make electricity. The juice of a lemon is very acidic and a good electrolyte. The lemon juice reacts with the copper penny and the zinc-coated nail to create a flow of electrons.
Students insert a penny into one side of the lemon and the nail into the other side, making sure they do not touch. The chemical reaction between the metal and the juice in the lemon produces an electrical voltage that can be measured with a multimeter. One lemon cell generates about 1 volt, but connecting several lemon battery cells with a metal wire can generate enough current to light a small LED.
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