The use of natural acid-base indicators in Chemistry teaching: a review. Research, Society and Development, [S. l.], v. 9, n. 9, p. e175997243, 2020. DOI: 10.33448/rsd-v9i9.7243. Disponível em: https://rsdjournal.org/rsd/article/view/7243. Acesso em: 5 dec. 2025.