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All Journal Didaktika: Jurnal Kependidikan LAVOISIER: Chemistry Education Journal
Haidhar Arvin Hidayatullah
Politeknik Negeri Malang
Chemistry Education Languange, Linguistic, Communication & Media Mathematics Other

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PBL Berbasis Workshop Sebagai Strategi Pembelajaran Efektif dalam Pendidikan Teknik Kimia Haidhar Arvin Hidayatullah; Ahmad Rosikhul Fahmi
Didaktika: Jurnal Kependidikan Vol. 14 No. 2 Mei (2025): Didaktika Jurnal Kependidikan
Publisher : South Sulawesi Education Development (SSED)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58230/27454312.2166

Abstract

Pendidikan teknik kimia dituntut untuk beradaptasi dengan kebutuhan industri global melalui metode pembelajaran inovatif seperti Project-Based Learning (PBL). Namun, penerapan PBL masih menghadapi tantangan seperti manajemen waktu, distribusi tugas tidak merata, dan variabilitas motivasi mahasiswa. Penelitian ini bertujuan mengevaluasi efektivitas PBL berbasis workshop dalam meningkatkan kompetensi mahasiswa teknik kimia di bidang bioproses serta relevansinya dengan ekspektasi industri. Mengevaluasi efektivitas PBL berbasis workshop dalam meningkatkan pemahaman dan keterampilan mahasiswa teknik kimia Politeknik Negeri Malang (Polinema) pada mata kuliah Bioproses, serta menilai kesesuaiannya dengan kebutuhan industri. Penelitian kuantitatif deskriptif menggunakan Course Experience Questionnaire (CEQ) yang melibatkan 61 mahasiswa. Instrumen CEQ terdiri dari 10 skala untuk mengukur persepsi mahasiswa terhadap aspek pembelajaran seperti kualitas pengajaran, keterampilan umum, beban kerja, dan kepuasan keseluruhan. Mayoritas mahasiswa merespons positif penerapan PBL berbasis workshop, dengan persentase tertinggi pada peningkatan keterampilan pemecahan masalah (GSS: 82%) dan kepuasan keseluruhan (OSI: 87%). Namun, 20,1% mahasiswa menyatakan beban kerja (AWS) kurang sesuai. Hasil juga menunjukkan kejelasan tujuan pembelajaran (CGS: 75%) dan penilaian yang adil (AAS: 66%) sebagai faktor pendukung keberhasilan. PBL berbasis workshop efektif dalam mengembangkan keterampilan teknis dan non-teknis mahasiswa serta meningkatkan kepuasan belajar. Namun, perlu optimasi manajemen beban kerja dan integrasi literasi digital untuk meningkatkan relevansi dengan industri.
COMPARISON OF UV-VIS SPECTROPHOTOMETRY, POTENTIOMETRIC TITRATION, AND CONDUCTOMETRY METHODS IN THE DETERMINATION OF VITAMIN C CONTENT IN COMMERCIAL BEVERAGES Haidhar Arvin Hidayatullah; Ahmad Wahyu Aprillianto; Arka Raditya Akmal; Faramufida Fricha Fricha; Venus Ramadhani Farichah; Meisela Rosalina Dewi
LAVOISIER: Chemistry Education Journal Vol 5, No 1 (2026)
Publisher : UIN Syekh Ali Hasan Ahmad Addary Padangsidimpuan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24952/lavoisier.v5i1.19967

Abstract

Verification of vitamin C content in commercial packaged beverages is an important analytical need, given the chemical instability of ascorbic acid under various environmental factors that can cause the actual content to deviate from the declared label value. This study aimed to compare the analytical performance of three vitamin C determination methods, namely UV-Vis spectrophotometry, potentiometric titration, and conductometry, applied to a commercial beverage sample claiming 1000 mg vitamin C per 500 mL. UV-Vis spectrophotometric analysis was performed by constructing a five-point calibration curve at 265 nm, potentiometric titration was conducted using 0.1000 N NaOH with continuous pH-based equivalence point detection via a calibrated glass electrode, and conductometry was performed by monitoring changes in electrical conductivity during neutralization with volume correction applied at each point. Each method was performed in five replicates. The results showed that UV-Vis spectrophotometry provided the best performance with a mean measured content of 1024.0 mg/500 mL, %error of 2.48%, and %RSD of 0.85%. Potentiometric titration yielded a mean content of 1038.7 mg/500 mL with %error of 3.87% and %RSD of 1.65%. Conductometry produced the largest deviation with a mean content of 1072.3 mg/500 mL, %error of 7.23%, and %RSD of 4.22%. The high deviation in conductometry was attributed to matrix interference from various ions and organic acids in the beverage contributing to the total conductivity response, while variability in potentiometric titration was influenced by the sensitivity of equivalence point detection to titrant addition rate and the non-selective response to all titratable acids in the sample. UV-Vis spectrophotometry is recommended as the most reliable and practical method for determining vitamin C content in complex commercial beverage matrices under routine analytical laboratory conditions.
Co-Authors Ahmad Rosikhul Fahmi Ahmad Wahyu Aprillianto Arka Raditya Akmal Faramufida Fricha Fricha Meisela Rosalina Dewi Venus Ramadhani Farichah