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Jurnal Akademika Kimia
Published by Universitas Tadulako
ISSN : 24775185     EISSN : 23026030     DOI : -
Core Subject : Science, Education,
Chemistry Education
Jurnal Akademika Kimia is an electronic open-access journal that aims to publish the latest research results in the area of chemistry education and pure chemistry from academicians, professionals, and other practitioners at all levels of chemistry education. The journal coverage includes the following: current trends of professional chemistry education, educational technology, teacher education, educational science, learning assessment, learning models and development of learning materials, as well as pure chemistry including organic chemistry, inorganic chemistry, analytical chemistry, physical chemistry, biochemistry and other chemistry fields such as environmental chemistry, that emphasis on a broad description of the general methods and processes for the synthesis, modification, and characterization of chemical materials.
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 10 Documents
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Search results for , issue "Vol. 14 No. 3 (2025)" : 10 Documents clear
Determination of Tanin Extract of Belimbing Wuluh Leaves (Averrhoa Bilimbi L.) by Uv-Vis Spectroscopy Methods Hardani, Ririen; Hardani, Muhammad F.; Hamzah, Baharuddin; Tamala, Sindy T.
Jurnal Akademika Kimia Vol. 14 No. 3 (2025)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2025.v14.i3.pp138-143

Abstract

Wuluh star fruit plant (Averrhoa bilimbi L.) was a traditional medicinal plant that was rarely utilized as a natural medicine and contained many secondary metabolite compounds, one of which was tannin. This study aimed to determine the type of tannin and the amount of tannin content in belimbing wuluh leaves. Wuluh star fruit leaf powder was extracted by the maceration method using 96 % ethanol solvent, and then the filtrate was concentrated by rotary evaporator. Identification of tannin types in the extract was performed using CH3COOH 10 %, (Pb(CH3COO)2) 10 %, HCl, FeCl3, and KBr. For analysis of tannin content, Folin-Ciocalteau reagent and 15 % Na2CO3 solution were added, and then analyzed using UV-Vis spectrophotometry at a wavelength of 765 nm. The results of the identification of tannin types showed that belimbing wuluh leaves included condensed tannins, and the results of the analysis showed that the tannin content was 7.282 mg/g extract.
Mass Balance of Hydrocarbons Fuel from Waste Cooking Oil and Plastic by Co-Pyrolysis Limbong, Fajar H.; Praja, Delphy Y. A.; Nurmawati, Ardika; Puspitawati, Ika N.; Saputro, Erwan A.
Jurnal Akademika Kimia Vol. 14 No. 3 (2025)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2025.v14.i3.pp132-137

Abstract

Indonesia has committed to climate change mitigation through a sustainable energy transition. Currently, the share of renewable energy in Indonesia’s energy mix only reaches 12 %. One type of renewable energy that the Indonesian government is focusing on is biofuel to reduce consumption and dependence on fossil fuels. Bio-oil produced through pyrolysis has the potential to be used as a biofuel. The chosen pyrolysis process is Co-Pyrolysis, which involves two or more feedstocks. In this study, the process was carried out using waste cooking oil (WCO) and HDPE waste as feedstocks. The process was conducted at 450°C for 30 minutes, with varying masses of both feedstocks. The data obtained were analyzed using mass balance and yield analysis to determine the optimal conditions for producing bio-oil as a hydrocarbon fuel. The optimal condition was found at a mass ratio of HDPE: WCO = 1:4, with a bio-oil yield of 78%. Under these optimal conditions, the conversion of HDPE plastic into heptadecane was 29.39%, and the conversion of oleic acid in waste cooking oil into heptadecane was 38.8%. This also serves as an initial step toward developing a pilot plant-scale process using HDPE plastic waste and waste cooking oil.
Determination of Total Flavonoid Content in Local Sakura Leaf Extract or Small Bungur (Lagerstroemia indica L.) Damayanti, Nur S.; Pulukadang, Sri H. V.; Aminah, Sitti; Hamzah, Baharuddin; Reny, Reny
Jurnal Akademika Kimia Vol. 14 No. 3 (2025)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2025.v14.i3.pp151-156

Abstract

The small bungur plant (Lagerstroemia indica L.) is one of the plants with potential as a medicinal plant. Almost all parts of this plant can be used, namely the leaves, stems, fruit and roots. Bungur leaves can be used for skin diseases, leaf powder for malaria, and decoction of old leaves for diabetes. Bungur leaves contain chemical compounds, one of which is flavonoids. This study aims to determine the total flavonoid content of extracts from young and old leaves of local cherry blossoms (small bungur), using UV-Vis spectrophotometry. The extraction method used was multistage maceration using three different solvents: hexane (nonpolar), ethyl acetate (semipolar), and methanol (polar). The results showed that the average total flavonoid content of young leaf extracts and old leaves of small bungur, measured by UV-Vis spectrophotometry at a maximum wavelength of 410 nm, was 8.810 mg/100g and 7.301 mg/100g, respectively. Among the three solvents used, extracts of young and old leaves of small bungur using hexane and ethyl acetate do not contain flavonoids, whereas extracts of young and old leaves of small bungur using methanol do.
The Effect of the PBL Model on Literacy and Numeracy Skills in Acid-Base Material Ratman, Ratman; Mustapa, Kasmudin; Ahmar, Dewi S.; Anastasya, Anastasya; Ijirana, Ijirana; Magfirah, Magfirah; Haeruddin, Haeruddin
Jurnal Akademika Kimia Vol. 14 No. 3 (2025)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2025.v14.i3.pp169-173

Abstract

Problem-Based Learning is a learning model that focuses primarily on problems in the learning process. It encourages students to collaborate in groups to solve problems through various activities. The purpose of this study was to determine the effect of the Problem-Based Learning (PBL) model on students' numeracy literacy skills in acid-base material. This study used a quantitative, true-experimental design. The research population consisted of 47 students. The research sample was obtained using purposive sampling, divided into an experimental class of 15 students from class XI MIA 2 and a control class of 16 students from class XI MIA 1. The research instruments included a literacy test comprising 20 multiple-choice questions and a numeracy test comprising five essay questions. Experts validated all instruments provided. Data analysis used the Mann-Whitney test. The results of the data analysis showed that the Mann-Whitney test p-value (0.000) was lower than the predetermined significance level of 0.05. Therefore, it can be concluded that the PBL learning model affects students' numeracy literacy skills.
Development of an E-Handout Based on Discovery Learning on The Reaction Rate for Class XI Students Faudia, Nurul; Sudrajat, Ajat; Nurfajriani, Nurfajriani
Jurnal Akademika Kimia Vol. 14 No. 3 (2025)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2025.v14.i3.pp144-150

Abstract

This study aims to determine the level of feasibility, practicality, and the students' readability response to e-handout-based discovery learning. This development research uses 4-D development models developed by S. Thiagarajan, Dorothy S. Semmel, and Melvin 1 Semmel. The 4-D development model has four stages: the Define stage, the Design stage, the Development stage, and the Disseminate stage, but this study is limited to 3-D: the Define stage, the Design stage, and the Development stage. The subjects in this study were 3 material experts and media experts, five chemistry subject teachers, and the readability response of MIPA 1 class XI students, with 33 people. Data collection instruments include an interview sheet, an e-handout assessment sheet by a material expert validator and a media expert, a practicality sheet by a teacher, and a student reading response sheet. Data analysis techniques use qualitative and quantitative data. Based on the results of the study, an analysis of the needs of students showed that students agreed that it was necessary to develop an e-handout based on discovery learning on the reaction rate material. Then, assessment by material expert validators of an 85% well-deserved e-handout, assessment by media expert validators of an 86% well-deserved e-handout, teacher practicability of an 88% well-deserved or very practical e-handout, and 87% of students' readability response to e-handouts is said to be very decent or very high.
Exploration of Teachers' Creative Thinking Ability Profile in Implementing Chemistry Learning in Senior High Schools Pongkendek, Jesi J.; Rochintaniawati, Diana
Jurnal Akademika Kimia Vol. 14 No. 3 (2025)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2025.v14.i3.pp157-162

Abstract

This study addresses the limited empirical evidence regarding chemistry teachers’ creative thinking performance in Indonesia. To fill this gap, the present research aims to explore the creative thinking ability profile of senior high school chemistry teachers. This quantitative descriptive study employed an exploratory design and included 21 chemistry teachers from various provinces in Indonesia. Data were collected using a validated creative thinking questionnaire consisting of four indicators: fluency, flexibility, originality, and elaboration. The results indicated that 66.67% of teachers were in the “Very Good” category, 28.57% in the “Good” category, and only 4.76% in the “Fair” category. Among the indicators, fluency showed the highest average score (91.23%), followed by elaboration (86.67%), flexibility (84.95%), and originality (80.38%). These findings indicate that chemistry teachers demonstrate strong abilities in generating and elaborating ideas. At the same time, originality remains comparatively lower due to systemic constraints such as inflexible education policies and limited pedagogical autonomy. The study also highlights the importance of institutional support, training programs, and collaborative learning environments that promote pedagogical creativity among teachers. Enhancing originality, in particular, requires schools to provide more autonomy and flexibility in instructional planning. Ultimately, the results of this study can serve as a reference for educational policymakers and curriculum developers in designing teacher development programs that not only improve content delivery but also cultivate innovative teaching mindsets, essential for meeting the demands of 21st-century learning.
Utilization of Black Tea Dregs as an Adsorbent of Metal Fe in Water using UV-Vis Spectrophotometry safitri, sauli; Aminah, Sitti; Nurmayanti, Yuli; Rahmawati, Sitti; Santoso, Tri
Jurnal Akademika Kimia Vol. 14 No. 3 (2025)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2025.v14.i3.pp187-193

Abstract

Tea dregs are household organic waste materials that can be utilized as low-cost adsorbents for heavy metal removal. Previous studies mainly employed green tea dregs and focused on Cu(II) adsorption, while studies on Fe(III) adsorption using black tea dregs and their direct application to Fe-contaminated water remain limited. This study evaluates the adsorption performance of black tea dregs toward Fe(III) ions and their application in water samples. Batch adsorption experiments were conducted using FeCl₃ solutions at pH 4.8 to determine the optimum contact time (15–90 minutes) and initial concentration (100–300 ppm). Fe(III) concentrations were analyzed using UV–Vis spectrophotometry. The results demonstrated an optimal contact time of 60 min and an optimal concentration, achieving 99.26% adsorption efficiency. Adsorption followed the Langmuir isotherm model with a maximum capacity of 37.04 mg/g (R² = 0.998). Application to well water samples resulted in 83.74% Fe removal, confirming the potential of black tea dregs as adsorbents.
Analysis of Sodium Content and Estimated Daily Intake from Shellfish Consumption: Case Study in Banda Aceh Ardila, Mutia; Kurniawan, Rizky; Kurniawan, Hadi; Harahap, Muhammad R.
Jurnal Akademika Kimia Vol. 14 No. 3 (2025)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2025.v14.i3.pp163-168

Abstract

This study aims to analyze sodium (Na) levels and estimate the daily intake (EDI) from the consumption of three shellfish species: blood mussels (Anadara granosa), kepah (Polymesoda erosa), and nipah (Geloina coaxans) obtained from Al Mahira Market and the Alue Naga area in Banda Aceh. Sodium concentrations were determined using Atomic Absorption Spectrophotometry (AAS). The results showed that sodium levels ranged from 1186 to 4656 mg/kg (wet weight). The highest EDI was found in blood mussels from Al Mahira Market at 0.997 mg/kg body weight/day (3.489% of the recommended daily sodium intake). In comparison, the lowest was observed in nipah clams from the exact location at 0.247 mg/kg body weight/day (0.866%). Overall, sodium intake from shellfish in both locations contributed less than 5% of the daily sodium limit. These findings indicate that shellfish consumption poses a low sodium-related health risk, although frequent or high intake may still contribute to long-term hypertension risk.
A Study Compares The Effectiveness of Hydrochloric and Sulfuric Acids in Hydrolyzing Jackfruit Seeds into Bioethanol Ginting, Elfrida; Simatupang, Lisnawaty; Sembiring, Jhony H.
Jurnal Akademika Kimia Vol. 14 No. 3 (2025)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2025.v14.i3.pp174-180

Abstract

North Sumatera Province, known for its jackfruit production, presents an opportunity to explore jackfruit seeds as a viable bioethanol feedstock. The province’s diverse agricultural commodities generate substantial agricultural waste, currently primarily used as fertilizer. This research aims to diversify waste utilization by focusing on jackfruit, a prominent commodity in North Sumatera, and its potential as a bioethanol feedstock. Given the scarcity of fossil fuels, exploring renewable energy sources, such as bioethanol derived from agricultural waste, is crucial. Identifying accessible sources within regions is vital. Converting jackfruit seed starch into bioethanol requires hydrolysis. This paper compares hydrochloric and sulfuric acid for bioethanol production. Qualitative testing confirmed the presence of bioethanol from both acids. The density of bioethanol produced using hydrochloric acid was 0.825 g/mL, 3.4% higher than the Indonesian standard value. Similarly, the density of bioethanol produced using sulfuric acid was 0.894 g/mL, 12% higher than the standard value. The viscosity of bioethanol produced using hydrochloric acid was 1.02 cp, 12% lower than the standard value. In contrast, bioethanol produced using sulfuric acid had a viscosity of 1.04 cp, 11% lower than the standard value. FTIR spectra of bioethanol treated with hydrochloric acid showed five prominent peaks: 3339.88 cm-1 (OH), 2953.35 cm-1 (-CH), 1643.79 cm-1 (-C-C), 1450.75 cm-1 (-CH3), and 1014.17 cm-1 (-CO). FTIR spectra of bioethanol treated with sulfuric acid showed only two major peaks at 3339.46 cm-1 and 1635.42 cm-1, both corresponding to -OH and -CH. The NMR spectra show three distinct peaks. In ethanol’s proton NMR spectrum, the first doublet at 1.71 and 1.61 ppm is the methyl group protons. The second peak at 2.02 ppm is the hydroxyl group proton. The third doublet at 3.59–3.62 ppm is the methylene group protons. All methods indicate that hydrochloric acid is a more effective hydrolytic agent than sulfuric acid.
Effectiveness of Problem-Based Learning with Dr Stone Animation on Grade XI Students’ Acid-Base Learning Outcomes Jannah, Miftahul; Tiwow, Vanny M. A.; Abram, Paulus H.; Nurmayanti, Yuli
Jurnal Akademika Kimia Vol. 14 No. 3 (2025)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2025.v14.i3.pp181-186

Abstract

The background of this research is low student performance in the topic and the need for an innovative, interactive, and contextual learning approach. This study aims to examine the effectiveness of the Problem-Based Learning (PBL) model using Dr Stone's animation media on students' learning outcomes in the acid-base topic for Grade XI students at SMA Negeri 1 Sirenja. The problem addressed in this research relates to how to improve student learning outcomes and engagement through the integration of contextual and technology-based media. The research employed a pre-experimental design with a one-group pre-test and post-test on a single experimental class consisting of 30 students. The instruments used included Lesson Plans (RPP), Student Worksheets (LKPD), Dr Stone animation media, and a multiple-choice learning outcome test consisting of 15 validated questions, reviewed and approved by expert validators. The validation results showed that all instruments were valid and appropriate for use. Student learning outcomes were analysed using the N-Gain score to measure the improvement after learning. The average N-Gain score was 0.7331 (73.31%), placing it in the moderately effective category. The average difference between pre-test and post-test scores was 37.10 points, indicating a significant improvement in student learning outcomes. Most students experienced substantial learning gains after participating in problem-based learning supported by animation media. This study demonstrates that combining the Problem-Based Learning (PBL) model with Dr Stone's animation media effectively improves student learning outcomes. Furthermore, this study supports the learning process by incorporating a contextual and interactive approach that fosters students’ motivation, deepens their conceptual understanding, and promotes active involvement in chemistry lessons. It also offers valuable guidance for teachers on applying technology-integrated, student-centred teaching strategies in science education.

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