Analisis Semi-Kuantitatif Kesadahan Air pada Berbagai Sumber Menggunakan Metode Uji Sabun Batang. Research and Practice of Educational Chemistry, [S. l.], v. 4, n. 02, p. 1–3, 2026. Disponível em: https://journal1.uinssc.ac.id/index.php/respec/article/view/24186. Acesso em: 28 may. 2026.