Ratih, P.D. and Rohaeti, E. 2022. Implementation of Electronic Worksheets Based on Problem-based Learning on Acid-Base Materials to Develop Students’ Problem-solving Ability . Jurnal Penelitian Pendidikan IPA. 8, 4 (Oct. 2022), 1979–1984. DOI:https://doi.org/10.29303/jppipa.v8i4.1928.