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Rery, R. Usman, Erviyenni Erviyenni, and Muhammad Agus Hardiyansyah. “Development of Electronic Activity Sheet Based Preview, Question, Read, Reflect, Recite, Review (pq4r) Learning Strategy on Ion Balance and PH of Buffer Solution”. Jurnal Pendidikan Kimia 14, no. 2 (August 13, 2022): 120–130. Accessed July 9, 2025. https://jurnal.unimed.ac.id/2012/index.php/jpk/article/view/34639.