Over the years, skin aging and skin cancer has been on the rise 1. Public education has become a necessity to ensure the public realizes the importance of sunscreen 2. Most sunscreens prior to the 1980s were effective against only UV-B while there was no protection against the more harmful radiation, UV-A 2. 4-T-butyl-40-methoxydibenzoylmethane (avobenzone) was discovered in the last 1980s and was found to provide protection against UV-A2. Sunscreens today contain both avobenzone and chemicals that block UV-B 2. The main purpose of this experiment is to determine the unknown concentration of avobenzone using UV-Vis spectroscopy and a standard curve. UV- Vis spectroscopy is a chemistry instrument that can provide the absorbance at a specific
