EVALUATION OF HIBISCUS AND ROSE FLOWER EXTRACTS AS ECO FRIENDLY NATURAL PH INDICATORS FOR ACID–BASE TITRIMETRIC ANALYSIS . Phoenix: International Multidisciplinary Research Journal ( Peer reviewed High Impact Journal ), [S. l.], v. 4, n. 2, p. 112–115, 2026. DOI: 10.65009/3cexr250. Disponível em: https://pimrj.org/index.php/pimrj/article/view/347.. Acesso em: 12 may. 2026.