Science University Research Symposium (SURS)
Publication Date
Fall 2026
College
College of Sciences & Mathematics
Department
Chemistry and Physics, Department of
SURS Faculty Advisor
Dr. Danielle Garrett
Presentation Type
Poster Presentation
Abstract
Salicylic acid is a commonly found chemical ingredient in skincare products, particularly products that are formulated to treat common skin issues like acne and clogged pores. Though commercial skincare products may advertise certain concentrations of a chemical ingredient, the consistency and accuracy of these concentrations are important considerations for consumers around the world. This research works to investigate the application of weak acid-strong base titrations as a general analytical technique in examining and determining the acidity of commercial facial cleansers that contain salicylic acid.
The main objective in this research is to analyze the titratable acidity of selected commercial facial cleansers using standardized sodium hydroxide (NaOH) solution with an average concentration of 0.110 M. Potassium hydrogen phthalate (KHP) was used as a primary standard to find the concentration of the NaOH titrant. Salicylic standards with an approximate concentration of 0.0100 M were then analyzed and used to establish titration curves as well as identify equivalence points using pH measurements. The titration curve of salicylic acid showed a sharp increase near the equivalence region, with observed pH changes from approximately 4.01 to 9.80. These measurements were then used to verify the proper indicator to be used for the sample titration trials, phenolphthalein. Selected commercial cleanser samples were prepared using 95% ethanol before undergoing titration trials due to its ability to improve salicylic acid solubility compared with using DI water.
The findings will be used to determine the analytical limitations of titrating complex commercial salicylic acid containing facial cleanser formulations and discuss the significance of accurate chemical measurements used for consumer products. This research also aims to provide an opportunity to connect general chemistry concepts like acid-base reactions, stoichiometry, and standardization to real-world applications.
Recommended Citation
Walker, Nia, "Quantifying Salicylic Acid in Commercial Facial Cleansers Using Titratable Acidity Analysis" (2026). Science University Research Symposium (SURS). 399.
https://repository.belmont.edu/surs/399
