Naphthalene lab freezing point determination is a technique used to assess the purity of naphthalene, a chemical with diverse industrial applications. By observing the freezing point depression caused by impurities, the method provides a quantitative measure of purity. The experiment involves crystallizing naphthalene and determining its freezing point using a melting point apparatus and thermometer. The freezing point is then used to calculate the purity based on the known relationship between freezing point and impurity concentration. This method is standardized by ASTM and ISO and finds applications in various industries for quality control, crystallinity studies, and industrial standards adherence.