SALUAT SIAHAAN. IMPROVE COLLIGATIVE PROPERTIES SKILLS AND PROBLEM SOLVING ABILITY OF SMA NEGERI 1 BABALAN CLASS XII STUDENTS USING MODEL PROBLEM BASED LEARNING (PBL). International Journal of Education and Literature, [S. l.], v. 2, n. 2, p. 21–38, 2023. DOI: 10.55606/ijel.v2i2.70. Disponível em: https://ijel.asia/index.php/ijel/article/view/70. Acesso em: 17 apr. 2025.