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All Journal Indonesian Review of Physics (IRiP) JPIn : Jurnal Pendidik Indonesia Hydrogen: Jurnal Kependidikan Kimia Lumbung Inovasi: Jurnal Pengabdian Kepada Masyarakat Indonesian Journal of STEM Education Indonesian Journal of Education and Community Services Indonesian Journal of Teacher Education
Ahmadi Ahmadi
Chemistry Education Study Program, Faculty Of Science, Engineering, And Applied Sciences, Universitas Pendidikan Mandalika, Jl. Pemuda No. 59A, Mataram, Indonesia
Humanities Astronomy Chemistry Earth & Planetary Sciences Education Engineering Environmental Science Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Physics Social Sciences Other

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Pengaruh Volume Minyak Sumbawa Sebagai Antibakteri dalam Pembuatan Sabun Mandi Cair Muhamad Zaenudin; Ahmadi Ahmadi; Hulyadi Hulyadi
Hydrogen: Jurnal Kependidikan Kimia Vol 8, No 2 (2020): Hydrogen: Jurnal Kependidikan Kimia
Publisher : Universitas Pendidikan Mandalika Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (911.789 KB) | DOI: 10.33394/hjkk.v8i2.2983

Abstract

Soap is a necessity for daily life, such as for bathing, washing, and cleaning other necessities. Normally various kinds of bacteria and fungi can live permanently on the skin, for example, such as thebacteria Staphyloccocus aureus. Antibacterial soap is used as a solution to this bacterial problem. Sumbawa oil is a natural ingredient that has the potential to be antibacterial in body wash. Sumbawa oil contains geraniol and citronellal, flavonoids, polyphenols and also contains saponins and tannins. The research objective was to find out what volume of Sumbawa oil is used to obtain the quality of liquid bath soap which has antibacterial content and meets SNI standards. This research is an experimental research in a laboratory by varying the volume of Sumbawa oil. The parameters measured in this study were the effect of variations in the volume of Sumbawa oil on antibacterial properties and pH of liquid bath soap. The findings in this study that the best antibacterial properties were found in the addition of 15 ml volume of Sumbawa oil with an average inhibition zone of 19.5-22.3 mm and a pH of 5 ml of Sumbawa oil volume with an average pH of 6.1. Based on the above findings, it can be concluded that the addition of Sumbawa oil has an effect on the antibacterial properties and pH of liquid bath soap. 
Synthesis Nanofiber PVA/Chitosan Using Electrospinning Method and Application for Gold Recovery Dwi Sabda Budi Prasetya; Ahmadi Ahmadi; Dwi Pangga; Ari Dwi Nugraheni; Harsojo Harsojo; Edy Supriyanto; Habibi Habibi
Indonesian Review of Physics (IRiP) Vol. 4 No. 1 (2021)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/irip.v4i1.3601

Abstract

This paper introduces a new process of gold recovery using nanofiber PVA/Chitosan from a gold-cyanide solution. Gold recovery in cyanide solution is made using nanofiber PVA/Chitosan produced with electrospinning technique. This research was conducted through several stages, 1) The designing of electrospinning tool, 2) Synthesis of nanofiber PVA/Chitosan with electrospinning technique, and 3) Gold recovery experiment using nanofiber PVA/Chitosan biosorption with the variations of initial concentration and time. The results showed that nanofiber PVA/Chitosan could be used as a gold ion absorber. The occuration of the isotherm process follows the Freundlich isotherm model, which is advantageous and occurs on a heterogeneous surface. From the results, it was agreed that nanofiber PVA/Chitosan is potential for gold recovery.
Pengaruh Variasi Jumlah Elektroda Dan Jenis Katalis Terhadap Produksi Gas Hidrogen Pada Elektrolisis Air Laut Ayu Lestari; Yeti Kurniasih; Dahlia Rosma Indah; Ahmadi Ahmadi
Jurnal Pendidik Indonesia (JPIn) Vol 5, No 2: Oktober 2022
Publisher : Yayasan Pendidikan Intan Cendekia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47165/jpin.v5i2.384

Abstract

Potensi energi terbarukan adalah mengubah air laut menjadi gas hidrogen yang diproduksi melalui proses elektrolisis. Elektrolisis adalah proses pemisahan molekul air (H2O) menjadi gas hidrogen (H2) dan oksigen (O2) dengan mengalirkan arus listrik. Energi gas hidrogen dari air laut tidak menyebabkan polusi, ringan dan sustainable sehingga dapat menjadi salah satu solusi terhadap pengurangan pemanasan global. Ada beberapa faktor yang mempengaruhi proses elektrolisis yaitu penggunaan katalisator dan luas permukaan elektroda. Penelitian ini bertujuan untuk mengetahui adanya pengaruh jumlah elektroda dan jenis katalis terhadap jumlah gas hidrogen yang diperoleh melaui proses elektrolisis air laut. Proses elektrolisis dilakukan dengan memvariasikan jumlah elektroda mulai dari 2,4,6,8 dan 10, serta memvariasikan jenis katalis yang digunakan yaitu HCl, HNO3, dan H2SO4. Berdasarkan hasil penelitian menunjukkan bahwa jumlah elektroda berbanding lurus dengan produksi gas hidrogen massa tertinggi dihasilkan pada jumlah 10 plat elektoda dengan massa sebesar 6,9966 gr. Penambahan katalis pada elektrolisis, massa gas hidrogen tertinggi yang dihasilkan adalah 6,9966 gr pada konsentrasi 0,1 M untuk H2SO4, katalis HCl massa gas hidrogen yang dihasilkan 6,6633 gr pada konsentrasi 0,1 M, dan katalis HNO3 massa gas hidrogen yang dihasilkan 5,6300 gr. Jenis katalis yang optimal digunakan pada proses elektrolisis air laut yaitu H2SO4.
Pembinaan Penyusunan Karya Ilmiah Sebagai Upaya Meningkatkan Profesionalisme Guru IPA Di MA Nurul Islam Sekarbela Sri Nopita Primawati; Husnul Jannah; Sucika Armiani; Agus Muliadi; Ahmadi Ahmadi
Lumbung Inovasi: Jurnal Pengabdian kepada Masyarakat Vol. 4 No. 2: November 2019
Publisher : Lembaga Penelitian dan Pemberdayaan Masyarakat (LITPAM)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36312/linov.v4i2.1163

Abstract

Tujuan dari kegiatan pengabdian ini adalah untuk membina guru-guru dalam penyusunan karya ilmiah, sebagai upaya meningkatkan profesionalisme guru IPA di MA Nurul Islam Sekarbela. Kegiatan ini melibatkan 15 orang guru IPA di MA Nurul Islam Sekarbela sebagai mitra kegiatan. Metode yang digunakan dalam kegiatan pengabdian adalah workshop, dengan rangkaian kegiatan yang meliputi pemberian materi, pelatihan, pendampingan, dan evaluasi. Hasil dari kegiatan ini menunjukkan peningkatan pengetahuan guru tentang langkah-langkah penulisan karya ilmiah dan artikel ilmiah, serta kemampuan menulis artikel ilmiah di kalangan guru MA Nurul Islam Sekarbela. Hal ini terlihat dari hasil artikel guru yang telah dipaparkan melalui presentasi, yang menunjukkan peningkatan kualitas artikel dan sesuai dengan harapan. Untuk mencapai hasil yang lebih baik, kegiatan pendampingan perlu dilakukan secara kontinu agar guru dapat mandiri dalam membuat karya ilmiah berupa artikel yang dapat dipublikasikan di jurnal-jurnal nasional. Training on Scientific Writing to Improve the Professionalism of Science Teachers at MA Nurul Islam Sekarbela The aim of this community service activity is to provide training to science teachers in scientific writing, as an effort to improve the professionalism of science teachers at MA Nurul Islam Sekarbela. This activity involves 15 science teachers at MA Nurul Islam Sekarbela as partners. The method used in this community service activity is a workshop, with a series of activities including material delivery, training, mentoring, and evaluation. The results of this activity show an improvement in the knowledge of teachers about the steps of scientific writing and scientific articles, as well as the ability to write scientific articles among teachers at MA Nurul Islam Sekarbela. This is evident from the results of the articles presented by teachers through presentations, which show an improvement in the quality of the articles and are in line with expectations. To achieve better results, continuous mentoring activities need to be carried out so that teachers can independently create scientific works in the form of articles that can be published in national journals.
Pembelajaran Eksperimen Kimia Bagi Siswa Pondok Pesantren Nurul Hakim Ratna Azizah Mashami; Ahmadi Ahmadi
Indonesian Journal of Education and Community Services Vol. 4 No. 1 (2024): Edisi Januari-Juni 2024
Publisher : Indonesian Publication Center

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Abstract

Chemistry instruction at the Nurul Hakim Islamic Boarding School (Pondok Pesantren) in Kediri, West Lombok Regency, predominantly relies on lecture-based methods. This approach has led to a lack of deep understanding of chemical concepts among students. Additionally, the limited laboratory facilities have hindered the implementation of practical experiments, which are crucial for enhancing students' comprehension of chemical principles. This community service activity aimed to improve students' learning experiences in chemistry and deepen their understanding of chemical reactions through experimental methods. The activity involved 64 male students from the 10th grade of the Special Education Program. The experimental methods employed in the chemistry lessons enabled students to actively observe, analyze, and apply chemical concepts. Student responses to the experimental learning approach were gathered through questionnaires. The implementation of this community service activity consisted of three stages: preparation, implementation, and follow-up. The results indicated a highly positive response from students, with an average score of 84.8%. The indicator of motivation to learn chemistry achieved the highest score of 90%. These findings suggest that experimental methods are effective in facilitating students' understanding of concepts and increasing their enthusiasm and motivation to learn chemistry. Therefore, experimental methods can be widely implemented to enhance the quality of chemistry education at various levels, particularly in Islamic boarding school environments.
Vegetable Oils and Hibiscus rosa-sinensis Leaf Extract in Solid Soap Formulation Marliandi Tamo Ama; Ahmadi; Hulyadi; Baiq Risni Maripa; Yusran Khery
Hydrogen: Jurnal Kependidikan Kimia Vol. 14 No. 3 (2026): June 2026
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v14i3.21188

Abstract

This study identified the effects of vegetable oil formulation and Hibiscus rosa-sinensis leaf extract concentration on the physicochemical quality of laboratory-scale solid soap. A 3 x 4 factorial design was used, consisting of three oil bases (A1, A2, and A3) prepared from coconut, olive, and palm oils and four extract concentrations (0, 1, 2, and 3%). The measured parameters were pH, moisture content, foam height, foam stability, organoleptic acceptance, and UV-Vis maximum wavelength of selected extract-containing soaps. The pH of all samples ranged from 9.00 to 9.43, indicating an alkaline soap system consistent with saponification. Moisture content varied from 11.00 to 19.00%; several samples met the 15% moisture criterion, while F1 and F4 exceeded it. Foam stability ranged from 74.96 to 88.89%, and foam height ranged from 0.33 to 1.33 cm. The A3 oil base showed the lowest mean moisture content (12.33%) and the highest mean foam stability (84.77%). Organoleptic evaluation indicated that F5 was the most preferred sample, whereas F11 was selected as the strongest technical candidate because it contained 2% extract, had the lowest moisture content, and showed the highest foam stability. UV-Vis analysis of A3 extract-containing soaps showed lambda max values of 374-377 nm with absorbance values of 0.747-0.751, supporting the persistence of flavonoid-related absorption in the soap matrix. The findings indicate that vegetable oil composition and H. rosa-sinensis leaf extract concentration influence solid soap quality and should be optimized jointly.
Profil Kesulitan Belajar Siswa Kelas XI Putra pada Berbagai Submateri Laju Reaksi di Lingkungan Pesantren Ahmadi Ahmadi; Baiq Risni Maripa
Indonesian Journal of Teacher Education Vol. 4 No. 2 (2023): Edisi Juli-Desember 2023
Publisher : Indonesian Publication Center

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Abstract

Reaction rate is a conceptually layered chemistry topic because students must coordinate observable phenomena, particle-level explanations, symbolic equations, graphs, and mathematical processing of experimental data. This study aimed to describe the profile and distribution of learning difficulties across six reaction-rate subtopics among Grade XI male students in an Islamic boarding-school setting. A quantitative descriptive design was employed with 82 students at Nurul Hakim Islamic Boarding School, Kediri, West Lombok. Data were collected using a 25-item achievement test covering: reaction-rate concepts and collision theory; factors affecting rate; rate laws and reaction orders; determination of order and the rate constant; graphs and energy diagrams; and applications in daily life and industry. Difficulty percentage was calculated as one minus the ratio of the mean score to the maximum score. The overall difficulty level was 45%, classified as moderate. The highest difficulty occurred in determining reaction order and the rate constant from experimental data (63%, high), followed by rate laws and reaction orders (50%, moderate). The lowest difficulty was found in basic reaction-rate concepts and collision theory (30%, low). At the individual level, 59 students (71.95%) were in the moderate-difficulty category and 23 students (28.05%) were in the low-difficulty category. These findings indicate that students' main barrier lies not in recalling basic concepts but in coordinating proportional reasoning, variable control, and symbolic calculations. Instruction should therefore prioritize scaffolded analysis of experimental tables, explicit links among macroscopic, submicroscopic, and symbolic representations, and guided practice in determining reaction orders and rate constants.
Pengaruh Penambahan Ekstrak Bunga Mawar terhadap Kualitas Sabun Mandi Berbasis Minyak Kelapa Baiq Risni Maripa; Ahmadi Ahmadi
Indonesian Journal of STEM Education Vol. 5 No. 1 (2023): Edisi Januari-Juni 2023
Publisher : Indonesian Publication Center

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Abstract

Bath soap is a hygiene product widely used by the public, with demand for safe, high-quality natural soaps continuing to rise. This study aims to analyze the effect of adding rose flower extract (Rosa damascena Mill.) on the quality of coconut oil-based bath soap, as assessed by physicochemical and organoleptic parameters. The experimental study employed a completely randomized design with four treatments of rose flower extract concentrations: 0% (control), 3%, 6%, and 9%, each with three replicates. The soap was produced via the cold saponification method using coconut oil as the base material, with the addition of sodium hydroxide, distilled water, and rose flower extract obtained through maceration in 70% ethanol for 3×24 hours. The quality parameters tested included pH, moisture content, foam height, foam stability, homogeneity, texture, color, aroma, and panelist acceptance. Data were analyzed using one-way ANOVA and Duncan’s post-hoc test at a significance level of ?=0.05. The results showed that the addition of rose flower extract significantly affected all soap quality parameters (p<0.05). The treatment with a 6% concentration produced soap with optimal quality: pH 9.2 ± 0.3, moisture content 18.4 ± 1.2%, foam height 8.6 ± 0.4 cm, foam stability 82.3 ± 2.1%, excellent homogeneity, soft texture, attractive pink color, strong characteristic rose aroma, and the highest panelist acceptance (score 4.2 ± 0.3 on a 5-point scale). A higher extract concentration (9%) resulted in a hard texture and an overly dark color, which the panelists found less appealing. Coconut oil-based bath soap with 6% rose flower extract meets the SNI 06-3532-2016 standard and has the potential to serve as a high-quality natural soap alternative with added aesthetic and aromatherapeutic value.
Co-Authors Agus Muliadi Ari Dwi Nugraheni Ayu Lestari Baiq Risni Maripa Baiq Risni Maripa Dahlia Rosma Indah Dwi Pangga Dwi Sabda Budi Prasetya Edy Supriyanto Habibi Habibi Harsojo Harsojo Hulyadi Hulyadi, Hulyadi Husnul Jannah Marliandi Tamo Ama Muhamad Zaenudin Ratna Azizah Mashami Sri Nopita Primawati SUCIKA ARMIANI, SUCIKA Yeti Kurniasih Yusran Khery