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All Journal Jurnal Penelitian Pendidikan IPA (JPPIPA) Jurnal Pijar MIPA
Mawardi Mawardi
Padang State University
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Materials Science & Nanotechnology Mathematics Physics

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Effect of concentration sulfuric acid on alumina extraction from napa soil Fiqrhatul Ilmi; Mawardi Mawardi
Jurnal Pijar Mipa Vol. 18 No. 5 (2023): September 2023
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram. Jurnal Pijar MIPA colaborates with Perkumpulan Pendidik IPA Indonesia Wilayah Nusa Tenggara Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpm.v18i5.5546

Abstract

West Sumatra is one of Indonesia's provinces with abundant and diverse natural potential. Based on data from the Department of Energy and Mineral Resources, West Sumatra province has a rich potential for metal and non-metallic minerals. Some types of minerals include gold lead (Au), zinc (Zn), manganese (Mn), coal, ironstone, and others. In iron ore, metal minerals contained iron minerals and gangue minerals such as silica and alumina. Napa soil is one of the materials found in West Sumatra containing aluminosilicate with a SiO2/ Al2O3 ratio of 63.20 %/ 16.55 %. It also contains TiO2, CaO, and K2O. Extraction of alumina generally using HCl or H2SO4 solvent. In previous research, HCl has been used as a solvent in extracting alumina from napa soil. Based on the literature search, no one has used H2SO4 as a solvent in the extraction of alumina from napa soil; therefore, it is necessary to conduct research as a material for further study. Therefore, this study will be conducted on variations in the concentration of acid solvents to determine the optimum amount of alumina products in the extraction of alumina in napa soil. In this study, the optimum results obtained alumina extraction with variations in the sulfuric acid concentration at a concentration of 6.0 M, with a % yield of 26.73%. The XRF analysis of alumina extraction showed that the Al2O3 content increased by 72.89%. Characterization of Alumina by FTIR indicated the presence of Al-O, Al-OH.
Flipped Classroom with Guided Inquiry on Buffer Solutions via Discord: A Study of Learning System Development Aprilia Silviani Harahap; Mawardi Mawardi; Okta Suryani; Umar Kalmar Nizar; Reza Akmar
Jurnal Penelitian Pendidikan IPA Vol 11 No 8 (2025): August
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v11i8.12350

Abstract

This research aims to design a flipped classroom learning system incorporating guided inquiry, using the Discord platform for buffer solution materials in Phase F. The study employed Plomp Educational Design Research framework, which comprises initial investigation, design, construction, testing, evaluation, and refinement. The product underwent validation through expert evaluation and was assessed for practicality and effectiveness. The content validity achieved a score of 0.89, while the media validity scored 0.90, meaning both belong to the valid category. Evaluation of practicality showed that the system was highly practical, with teachers and students giving it an overall score of 90% and 92% respectively. Effectiveness was measured by analyzing pretest and posttest results using the N-Gain formula, yielding a score of 0.75, which is classified as high gain. The overall findings suggest that the developed learning system is valid, practical, and effective in enhancing students’ understanding of buffer solutions. Moreover, the integration of Discord provides an accessible and interactive digital environment, aligning with the needs of 21st-century education and the Merdeka Curriculum. Therefore, this model can be recommended as an innovative solution for digital chemistry instruction in senior high schools.
Co-Authors Aprilia Silviani Harahap Fiqrhatul Ilmi Reza Akmar Suryani, Okta Umar Kalmar Nizar