Investigatory Project

Topics: PH indicator, PH, Wine Pages: 3 (865 words) Published: August 24, 2013
Angeles University Foundation
Integrated School
Angeles City

GraPeNaTor: “Grapes’ Peelings extract, a Natural Indicator for acids and bases

As a partial requirement for the 1st grading period
Submitted by: Josh Wallen Beltran
Riu Rodriguez
Abbylaine Priniel
Mikee Reyes
Lesley Anne Timbol
Many natural substances contain molecules that change color in liquid solutions when the solution is changed from a basic to acidic nature or vice versa. Natural dyes such as pigments of flowers, fruits, vegetables, and many others have such properties. Natural indicators when added in a small amount of solution, give an indication of the pH of the solution.

Acids and bases are very essential in our lives. They can be used in cleaning, helps in our digestion, for cosmetics, the can also be used as disinfectant, and used to make other materials. Both acids and bases function as cleaning agents, as they have the ability to remove stains and other dirt from surfaces. Soap is an example of a base. Acids are also present in the stomach (Hydrochloric Acid) and are used to dissolve swallowed food so it can be absorbed. People with stomachs that produce too much acid can take antacids, which are basically bases intended to neutralize the acid. Acids and bases are used to clean and smooth the skin. However, those that are too strong can burn the skin. Sometimes the celebrities use this for the protection, cleanliness, and smoothness of their skins. For disinfectants, strong acids can kill bacteria and other microorganisms, preventing the spread of disease. Bases are used to make a variety of materials. Calcium hydroxide (Limewater) is used to make plaster and mortar. Acids and bases are also found in foods, the environment and in chemicals including medicines. And lastly, the body also has a buffer system that helps control the level of acids and bases. The pH levels are controlled using bicarbonate or HCO3. Also, the...
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