Implementasi Model Problem Based Learning dalam Pembelajaran Asam Basa untuk Meningkatkan Hasil Belajar Peserta Didik SMA Negeri 21 Medan

Freddy Tua Musa Panggabean; Aldo Geo Frengky Saragih; Fitri Ananda Siregar; Halimatussadiyah Dalimunthe; Kristin Purba; Mutia Patmasari Batubara; Regina Tesalonika Silaban; Wiranda Hasibuan

doi:10.36312/panthera.v6i4.1603

Authors

Freddy Tua Musa Panggabean Program Studi Pendidikan Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Negeri Medan, Jalan William Iskandar Ps. V, Deli Serdang, Sumatera Utara 20221, Indonesia
Aldo Geo Frengky Saragih Program Studi Pendidikan Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Negeri Medan, Jalan William Iskandar Ps. V, Deli Serdang, Sumatera Utara 20221, Indonesia
Fitri Ananda Siregar Program Studi Pendidikan Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Negeri Medan, Jalan William Iskandar Ps. V, Deli Serdang, Sumatera Utara 20221, Indonesia
Halimatussadiyah Dalimunthe Program Studi Pendidikan Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Negeri Medan, Jalan William Iskandar Ps. V, Deli Serdang, Sumatera Utara 20221, Indonesia
Kristin Purba Program Studi Pendidikan Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Negeri Medan, Jalan William Iskandar Ps. V, Deli Serdang, Sumatera Utara 20221, Indonesia
Mutia Patmasari Batubara Program Studi Pendidikan Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Negeri Medan, Jalan William Iskandar Ps. V, Deli Serdang, Sumatera Utara 20221, Indonesia
Regina Tesalonika Silaban Program Studi Pendidikan Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Negeri Medan, Jalan William Iskandar Ps. V, Deli Serdang, Sumatera Utara 20221, Indonesia
Wiranda Hasibuan Program Studi Pendidikan Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Negeri Medan, Jalan William Iskandar Ps. V, Deli Serdang, Sumatera Utara 20221, Indonesia

DOI:

https://doi.org/10.36312/panthera.v6i4.1603

Keywords:

Acid-Base, Learning Outcomes, N-Gain, Problem-Based Learning, Pre-Experimental

Abstract

Students' understanding of acid-base concepts remains low due to the abstract nature of the material at the microscopic and symbolic levels; therefore, an instructional model capable of fostering active student engagement is required. This study aimed to determine the effectiveness of the Problem-Based Learning (PBL) model in teaching acid-base concepts to improve the learning outcomes of Grade XI Science students at SMA Negeri 21 Medan. A pre-experimental method with a one-group pretest-posttest design was employed. The study involved 33 students selected via purposive sampling. Data were collected using a 15-item multiple-choice test and analyzed descriptively using SPSS and Microsoft Excel to calculate the mean score, standard deviation, mastery level, and N-Gain score. The results showed that the mean pre-test score of 28.68 increased to 63.52 on the post-test. The mean N-Gain score was 0.50 (moderate category), with 87.88% of students falling into the effective category (N-Gain ≥ 0.30); this was supported by the distribution of individual N-Gain scores (ranging from 0.07 to 1.00), which consistently demonstrated improvement across all subjects. Instructional implementation reached 100% (rated "very good"), indicating that the teacher consistently applied all stages of the PBL model in accordance with the lesson plan. It is concluded that the PBL model effectively improved student learning outcomes regarding acid-base concepts, although full class mastery was not achieved due to time constraints.

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