CONCEPTUAL DIFFICULTIES OF SECONDARY SCHOOL STUDENTS IN UNDERSTANDING ACID-BASE CHEMISTRY. Pakistan Journal of Social Research, [S. l.], v. 4, n. 1, p. 422–428, 2022. DOI: 10.52567/pjsr.v4i1.666. Disponível em: https://ojs.pjsr.com.pk/index.php/PJSR/article/view/666. Acesso em: 5 aug. 2025.