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All Journal Orbital: Jurnal Pendidikan Kimia Jurnal SOLMA Walisongo Journal of Chemistry ALKIMIA : Jurnal Ilmu Kimia dan Terapan Indonesian Journal of Chemical Science and Technology KATALIS: Jurnal Penelitian Kimia dan Pendidikan Kimia CHEDS: Journal of Chemistry, Education, and Science
Fahmi, Jam’an
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Energy Environmental Science Materials Science & Nanotechnology Social Sciences Other

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Influence of EM4 Inoculum on Biogas Yield and pH Dynamics in Lettuce and Cabbage Waste Fermentation Ramadhan, Dwi Sapri; Safitri, Wulan Dwi; Wardana, Dian; Fahmi, Jam'an; Zubir, Moondra; Andini, Ayu; Simamora, Elisabeth; Limbong, Julian; Sihotang, Pelita; Husna, Wiki Nadia; Siregar, Nurdin
Indonesian Journal of Chemical Science and Technology (IJCST) Vol. 8 No. 2 (2025): JULY 2025
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v8i2.70612

Abstract

Biogas production from vegetable waste offers a practical pathway for reducing organic residues and supporting small-scale renewable energy systems. This study investigates the influence of EM4 inoculum on gas accumulation and pH dynamics during an 8-day batch fermentation of lettuce and cabbage waste. Four reactors were prepared containing 200 g vegetable waste and 200 mL water with or without 30 g EM4. Gas accumulation was quantified by balloon circumference at day 2, day 4, day 6 and day 8 and converted to volume using geometric calculations. Lettuce generated the highest peak volumes with maximum values exceeding 330 cm³ while cabbage produced less than 60 cm³ under comparable conditions. pH trajectories showed that cabbage plus water decreased from pH 7 to pH 6 whereas lettuce plus water increased from pH 7 to pH 8. Reactors containing EM4 stabilised at pH 6 throughout the fermentation indicating inoculum-supported buffering. These results demonstrate that substrate characteristics strongly influence early-stage gas formation and that EM4 moderates pH fluctuations even under uncontrolled ambient conditions. The findings provide initial evidence that lettuce is a more degradable feedstock than cabbage and emphasise pH regulation as a key requirement for improving methane-oriented biogas performance in simple batch systems.
Effect of Organic and Inorganic Compounds on the Conductivity of Salt Solutions Safitri, Wulan Dwi; Wardana, Dian; Ramadhan, Dwi Sapri; Fahmi, Jam'an; Zubir, Moondra; Purba, Sunita Karin; Puandra, Esti Miska; Siregar, Nurdin
Indonesian Journal of Chemical Science and Technology (IJCST) Vol. 8 No. 2 (2025): JULY 2025
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v8i2.70635

Abstract

This study examines the effects of selected organic and inorganic compounds on the electrical conductivity of salt solutions. Organic substances (sugar, coffee, tea, and a surfactant-based cleaner) and inorganic additives (ammonium chloride in cough medicine, povidone–iodine, and carbonated beverage) were mixed with salt solutions at varying concentrations to evaluate their influence on ion availability and mobility. The results show that conductivity increases proportionally with salt concentration, confirming that ion content is the primary factor governing charge transport. Inorganic ionic additives significantly enhanced conductivity by releasing additional ions into the solution, whereas non-ionic organic compounds consistently reduced conductivity at low salt levels by diluting ionic species and hindering ion mobility. Conductivity in organic mixtures increased only when salt concentration became dominant. These findings highlight the contrasting mechanisms of organic and inorganic additives in modifying electrolyte behavior and provide useful insight for chemistry education and simple electrochemical analysis.
Analysis of the Effect of Varying Concentrations of Strong Acids (HCl) and Weak Acids (CH3COOH) with Mixing of Bases (Detergent) on the Temperature Increase of the Reaction Results Fahmi, Jam'an; Ramadhan, Dwi Sapri; Wardana, Dian; Safitri, Wulan Dwi; Zubir, Moondra; Siregar, Nurdin; Br Sebanyang, Resi Mai Linda Etaminta; Br Napitupuli, Monika Shinta Kasih; Lumbantoruan, Sifra H.R
Indonesian Journal of Chemical Science and Technology (IJCST) Vol. 8 No. 2 (2025): JULY 2025
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v8i2.70670

Abstract

Neutralization reactions between acids and bases are generally exothermic processes that release heat because of water formation from H⁺ and OH⁻ ions. This study aims to investigate the effect of varying concentrations of a strong acid (HCl) and a weak acid (CH₃COOH) on the temperature increase produced when these acids are reacted with a detergent-based alkaline material. Experiments were conducted using three acid concentrations—0.1 M, 0.3 M, and 0.5 M—each mixed with 3 g, 5 g, and 7 g of detergent in a reaction volume of 25 mL. The results indicate that increasing acid concentration correlates positively with greater temperature elevation. The largest temperature increase, 5.7°C, was observed in the reaction between 0.5 M HCl and 7 g of detergent, whereas the lowest increase, 0.5°C, occurred in the reaction between 0.1 M CH₃COOH and 3 g of detergent. Differences in ionization strength between strong and weak acids significantly influence the amount of heat released during neutralization. These findings demonstrate that both acid strength and base mass play important roles in determining the exothermic energy output of acid–base reactions.
PENERAPAN MEDIA PEMBELAJARAN BERBASIS WEBSITE MENGGUNAKAN MODEL KOOPERATIF TIPE SCRAMBLE PADA MATERI HIDROLISIS GARAM Safitri, Wulan Dwi; Eddiyanto, Eddiyanto; Wardana, Dian; Ramadhan, Dwi Sapri; Fahmi, Jam'an
CHEDS: Journal of Chemistry, Education, and Science Vol 9, No 2 (2025)
Publisher : Universitas Islam Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30743/cheds.v9i2.11838

Abstract

Fokus penelitian ini adalah untuk menentukan peningkatan hasil belajar siswa di kelas eksperimen setelah diajar menggunakan media pembelajaran berbasis web dengan model kooperatif tipe scramble pada materi hidrolisis garam. Instrumen yang digunakan adalah 20 pertanyaan objektif. Dari hasil analisis, rata-rata peningkatan siswa kelas eksperimen adalah 0,7414 (kategori tinggi) dan di kelas kontrol adalah 0,5881 (kategori sedang). Berdasarkan hasil uji hipotesis dengan uji t sisi kanan, ditemukan bahwa t hitung lebih besar dari t tabel atau 8,064 2,0021 dengan tingkat signifikansi α = 0,05, sehingga Ha diterima, sehingga peningkatan hasil belajar di kelas yang diajar menggunakan media pembelajaran berbasis web lebih tinggi daripada peningkatan hasil belajar di kelas yang diajar tanpa menggunakan media pembelajaran berbasis web (konvensional).
COMPARATIVE GC–MS CHARACTERIZATION AND PHYSICOCHEMICAL EVALUATION OF Citrus hystrix DC. ESSENTIAL OILS FROM DIFFERENT PLANT PARTS Ramadhan, Dwi Sapri; Warsito, Warsito; Azzahra, Vina Octavia; Wardana, Dian; Fahmi, Jam’an; Safitri, Wulan Dwi
Walisongo Journal of Chemistry Vol. 8 No. 2 (2025): Walisongo Journal of Chemistry
Publisher : Department of Chemistry Faculty of Science and Technology UIN Walisongo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21580/wjc.v8i2.28063

Abstract

Essential oils from Citrus hystrix DC. are known for their rich bioactive composition, particularly citronellal, which has extensive applications in the fragrance and pharmaceutical industries. However, comparative studies on the chemical and physicochemical properties of oils extracted from different plant parts remain limited. This study investigated essential oils obtained by steam distillation from leaves (LEO), twigs (TEO), and a leaf–twig mixture (LTMEO). The oils were characterized using GC–MS and FTIR analyses, alongside measurements of density, refractive index, and yield. LTMEO yielded a yellow, aromatic oil with a density of 0.856 g/mL, a refractive index of 1.439, and a yield of 0.60%, consistent with the quality requirements of SNI 9231:2023. GC–MS profiling identified citronellal as the dominant compound, with concentrations of 83.88% in LEO, 69.88% in LTMEO, and 46.47% in TEO. FTIR spectra confirmed the presence of aldehyde functional groups, consistent with the high citronellal content. Minor constituents such as linalool (5.24–8.91%), isopulegol (0.47–2.95%), β-citronellol (2.03–12.22%), and citronellyl acetate (4.28–6.48%) were also detected, potentially affecting citronellal isolation. Overall, the findings highlight C. hystrix DC. leaves as the most promising source of citronellal for industrial applications.
ntesis Perekat Kayu Lignin–Urea Formaldehida (LUF) Berbasis Lignin yang Diekstraksi dari Tandan Kosong Kelapa Sawit (TKKS Dian Wardana; Eddiyanto; Nurfajriani; Dwi Sapri Ramadhan; Wulan Dwi Safitri; Jam'an Fahmi
ALKIMIA Vol 10 No 1 (2026): ALKIMIA
Publisher : SCIENCE AND TECHNOLOGY FACULTY OF UNIVERSITAS ISLAM NEGERI RADEN FATAH PALEMBANG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19109/ccj7gm39

Abstract

Oil palm empty fruit bunches are one of the underutilized plantation wastes. Lignin is one of the components of plant cell walls besides cellulose and hemicellulose that can be used as a raw material for the synthesis of lignin-based adhesives, namely lignin-urea-formaldehyde (LUF) adhesive resins. The polymerization reaction of LUF formation was confirmed from the shift and change in the FTIR wavenumber of the -CO-ether group of LUF compared to UF and LF obtained during the synthesis process. The tensile strength test results of all adhesives produced exceeded the tensile strength value of commercial UF adhesives, and it was found that increasing the lignin concentration in the synthesized adhesives was directly proportional to the tensile strength value. Increasing the lignin concentration was also able to reduce formaldehyde emissions from all variations of adhesives produced, but was unable to exceed the lower formaldehyde emission value of UF adhesives.
Pemanfaatan Pucuk Tebu Dan Kotoran Ternak Menjadi Kompos Organik Kaya Nutrisi Zubir, Moondra; Junaidi, Agus; Miswanda, Dikki; Fahmi, Jaman; Lubis, Ali Hamzah; Pratama, Adryansyah Anugrah; Anggita, Nur Anisa
Jurnal SOLMA Vol. 15 No. 1 (2026)
Publisher : Universitas Muhammadiyah Prof. DR. Hamka (UHAMKA Press)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22236/solma.v15i1.22304

Abstract

Background: Kegiatan pengabdian kepada masyarakat ini bertujuan meningkatkan pengetahuan, keterampilan, dan kemandirian masyarakat Desa Banyumas dalam memanfaatkan limbah pucuk tebu dan kotoran ternak menjadi kompos organik melalui penerapan teknologi tepat guna. Metode: Program dilaksanakan melalui pendidikan masyarakat, pelatihan, difusi teknologi, dan pendampingan, dengan introduksi mesin pencacah pucuk tebu serta praktik pembuatan kompos berbasis bahan lokal. Hasil: Hasil kegiatan menunjukkan adanya peningkatan pemahaman masyarakat mengenai pengelolaan limbah pertanian, meningkatnya efisiensi proses pencacahan bahan baku, dan terselenggaranya praktik pengomposan yang lebih terstruktur. Program ini berkontribusi positif terhadap pengurangan limbah pertanian dan membuka peluang pemanfaatan kompos organik bagi kebutuhan pertanian masyarakat. Ke depan, evaluasi mutu kompos secara laboratorium dan pendampingan pemasaran masih diperlukan agar program benar-benar berkelanjutan
PENGEMBANGAN LKPD SIFAT KOLIGATIF LARUTAN BERBASIS PBL UNTUK MENGUKUR KETERAMPILAN BERPIKIR KRITIS PESERTA DIDIK Jaman Fahmi; Budiman Anwar; Wulan Dwi Safitri; Dwi Sapri Ramadhan; Dian Wardana; Dimas Ridho; Ekin Dwi Arif Kurniawan; Ahmad Fauzi Syahputra Yani
KATALIS: Jurnal Penelitian Kimia dan Pendidikan Kimia Vol 9 No 1 (2026): Jurnal Katalis Volume 9 Nomor 1 Tahun 2026
Publisher : Universitas Samudra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33059/katalis.v9i1.13597

Abstract

This study aims to develop a PBL (Problem-Based Learning) based Student Worksheet (LKPD) on the topic of colligative properties of solutions that are valid, reliable, and feasible to be used as an instrument for assessing students’ critical thinking skills. This research employed a Type 1 Design and Development Research (DDR) model consisting of the stages of Analysis, Design, Development, Try-out, and Evaluation, although its implementation was limited to the Try-out stage. The study involved validators comprising university lecturers and chemistry teachers, as well as 106 twelfth-grade science students from MAN 2 Model Medan selected through purposive sampling. Data were collected using semi-structured interview guidelines and assessment questionnaires and subsequently analyzed using the Content Validity Ratio (CVR), Content Validity Index (CVI), item validity tests, reliability analysis, item difficulty index, discrimination index, normality, and homogeneity tests. The findings indicate that out of 16 initial items, 11 essay items were found to be valid (Pearson Corelation > 0,3) and reliable with internal reliability coefficients categorized as good (Cronbach’s Alpha > 0.7). The difficulty indices of the items ranged from difficult to easy, with discrimination indices categorized as moderate to very good. Therefore, the developed PBL-based LKPD is deemed feasible for use in measuring students’ critical thinking skills in the context of colligative properties of solutions.
Co-Authors Agus Junaidi Ahmad Fauzi Syahputra Yani Ahmad Nasir Pulungan Anggita, Nur Anisa Aulia, Amanda Ayu Andini ayumi, Sheilla Maliza Azzahra, Vina Octavia Br Nadeak, Stephani Bintang N. Br Napitupuli, Monika Shinta Kasih Br Sebanyang, Resi Mai Linda Etaminta Br Sipahutar, Desy Meriani Budiman Anwar Damanik, Angelica Damanik, Wicha Rosari Dian Wardana Dian Wardana Dikki Miswanda Dimas Ridho Dwi Sapri Ramadhan Dwi Sapri Ramadhan Eddiyanto Eddiyanto Eddiyanto Everyanti, Ida Cathy HERNANI - Husna, Wiki Nadia Irma Syahputri Kurniawan, Ekin Dwi Arif Limbong, Julian Lubis, Ali Hamzah Lubis, Ghania Dhia Ulhaq Lumbantoruan, Sifra H.R Manalu, Anrian Haholongan Manullang, Okto Panca Manullang, Riska Greselia Mendrofa, Bulan Susanti Moondra Zubir Nahadi Nainggolan, Lidya Revalina Nasution, Dhea Ananda Nurdin Siregar Nurfajriani Pratama, Adryansyah Anugrah Puandra, Esti Miska purba, Gracia Purba, Sunita Karin Putri Ayunicha Rahmadyani, Zaskia Ramadhan , Dwi Sapri Ramadhan, Dwi Sapri S, Abd Hakim Safitri, Wulan Dwi Sagala, Novitri Yolanda Shallomita, Grace Sigalingging, Olivia Gina Ananta Sihotang, Pelita Silalahi, Sarina Septiani Simamora, Astuty Evalina Simamora, Elisabeth Siregar, Ida Cathy Everyanti Siregar, Koriatul Jannah Siregar, Nuraini Tambunan, Ida Mariati Wardana, Dian Warsito Warsito Wulan Dwi Safitri Wulan Dwi Safitri Zubir, Moondra