Wahyudi, A. et al. 2025. Kinetic Analysis of Saponification Reaction in Eco-Friendly Soap Production Based on Waste Cooking Oil. Hydrogen: Jurnal Kependidikan Kimia. 13, 3 (Jul. 2025), 713–723. DOI:https://doi.org/10.33394/hjkk.v13i3.14828.