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Rery, R. U., Erviyenni, E., & Hardiyansyah, M. A. (2022). 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(2), 120–130. https://doi.org/10.24114/jpkim.v14i2.34639