KHAIRUNNISA, H. H.; SARI , S. .; SUKMAWARDANA , Y. . Application of Project-Based Worksheets on the Utilization of Rice Husk Charcoal Adsorbent to Reduce Groundwater Hardness in Develoving Students’ Scientific Performance. IJCER (International Journal of Chemistry Education Research), [S. l.], v. 9, n. 2, p. 93–107, 2025. DOI: 10.20885/ijcer.vol9.iss2.art1. Disponível em: https://journal.uii.ac.id/IJCER/article/view/41042. Acesso em: 5 dec. 2025.