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EduChemia: Jurnal Kimia dan Pendidikan
Published by Universitas Sultan Ageng Tirtayasa
ISSN : 25024778     EISSN : 25024787     DOI : http://dx.doi.org/10.30870/educhemia.v6i2.10412
Core Subject : Science, Education, Engineering,
Chemical Engineering, Chemistry & Bioengineering Chemistry Education Materials Science & Nanotechnology
Focus and Scope Educhemia (Jurnal Kimia dan Pendidikan) is Periodicals published the results of research related to the development of science and technology in the field of Chemistry and Chemistry education as a form of intellectual property Chemistry: Organic chemistry, Inorganic chemistry, Biochemistry, Physical chemistry, Analytical Chemistry, Environmental Chemistry, Material chemistry, Ethnochemistry. Chemistry education: chemistry learning design and model, chemical education curricula, Technology innovation and media/multimedia in chemistry learning, development of evaluation tools, lesson study and classroom action research
Arjuna Subject : Kimia(semua kategori) - Kimia Organik
Articles 207 Documents
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Electrochemical Detection of Pb(II) Using A Pencil Electrode with Square Wave Anodic Stripping Voltammetry Method Muhammad Zamhari; Muhamad Aditya Hidayah; Gerda Pintoko Tunjungsari; Endaruji Sedyadi
EduChemia (Jurnal Kimia dan Pendidikan) Vol 7, No 2 (2022)
Publisher : Department of Chemical Education Faculty of Teacher Training and Education Universitas Su

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30870/educhemia.v7i2.14756

Abstract

This work describes a simple and inexpensive Pb(II) determination by a pencil electrode using the square wave anodic stripping voltammetry (SWASV) method. This research was applied using a batch cell system on 10 mL of 0.1 M acetate buffer pH 4.5. The precision was performed with repeatability and reproducibility in Pb(II) concentrations of 0.2, 0.4, 0.6, and0.8µg mL-1. Two linear ranges were obtained in the concentration of 0.1–1.0 and 2.0–8.0 µg mL-1. This method offers a detection limit of 0.07 µg mL-1 and a quantification limit of 0.24 µg mL-1. The technique performed good repeatability (RSD= 7.28–9.53%) and good reproducibility (RSD=7.07–15.10%). The precisions are accepted according to the Association of Official Analytical Chemists (AOAC) standard (RSD repeatability <11% and RSD reproducibility <16% at a concentration of 1 µg mL-1). The method offered high operational stability up to 18 measurements (RSD=4.6%). The technique performs acceptable results with low random error in determining Pb(II).
Phytochemical Screening, Antioxidant, Antidiabetic Activity, and Toxicity of Melastoma malabathricum L. Leaves Lia Meilawati; Megawati Megawati; Indah Dwiatmi Dewijanti; Mamay Maslahat
EduChemia (Jurnal Kimia dan Pendidikan) Vol 7, No 1 (2022)
Publisher : Department of Chemical Education Faculty of Teacher Training and Education Universitas Su

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30870/educhemia.v7i1.12481

Abstract

Extraction and fractionation have been carried out to determine the content of compounds in Harendong (Melastoma malabathricum L.) leaves, antioxidant test using the 1,1-diphenyl-2-picrylhydrazil (DPPH) method, antidiabetic using α-glucosidase enzyme, and toxicity using the Bhrine Lethality Test Shrimp method (BSLT). The study showed that the methanol extract and the ethyl acetate fraction of M. malabathricum  leaves had secondary metabolites: flavonoids, tannins, and saponins. In contrast, the butanol fraction contained flavonoids and saponins, and the water fraction contained tannins. The hexane fraction of M. malabathricum leaves did not contain secondary metabolites. The result of antioxidant and antidiabetic activity tests showed that ethyl acetate fraction has higher activity with IC50 values of  23.08 µg/mL and 3.835 µg/mL. Meanwhile, the BSLT toxicity test of methanol extract and all fractions of M. malabathricum  leaves against Artemia salina L. larva had an LC50 > 1000 g/mL.
Development of pH Measuring Strip Test Based On West Kalimantan Local Plant Aprianus Aril; Masriani Masriani; Husna Amalya Melati
EduChemia (Jurnal Kimia dan Pendidikan) Vol 7, No 2 (2022)
Publisher : Department of Chemical Education Faculty of Teacher Training and Education Universitas Su

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30870/educhemia.v7i2.15252

Abstract

Synthetic acid-base indicators possess some disadvantages. Therefore, it is necessary to develop a natural acid-base indicator made from a mixture of plant extracts, which has a strip form, is safe, eco-friendly, has a wide pH range, and has clear color changing. This research aims to determine the pH range, make a pH indicator in the strip form, and produce a biodegradable acid-base indicator made from a mixture of Melastoma malabathricum flower, Dioscorea alata rhizome, Syzygium paniculatum leaves, Garcinia fruit peel, Eleutherine bulbosa rhizome extracts. Plant extracts were obtained using the maceration method. pH range was evaluated using the visual method by sensing the color changing in the pH range from 1 to 14. pH indicator strip was made by applying filter paper in the strip form into the extract mixture for 2 hours. The biodegradable property of acid-base indicator strips was established by measuring indicator strip degradation after planting it in the ground for 20 days at room temperature. The results showed that the acid-base indicator strip made from a mixture of plant extracts was able to give a color change from pink to light green in the pH range of 3-8 and can be decomposed completely after planting it in the ground for 20 days. Thus, it indicated that a natural pH indicator strip based on West Kalimantan plants has the potential to be developed as a safe and effective acid-base indicator to substitute synthetic acid-base indicators. 
Learning Persistence and Student Metacognitive Ability Using The Discovery Model fuldiaratman fuldiaratman; Issaura Sherly Pamela; Dewi Mariana Elisabeth Lubis
EduChemia (Jurnal Kimia dan Pendidikan) Vol 7, No 2 (2022)
Publisher : Department of Chemical Education Faculty of Teacher Training and Education Universitas Su

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30870/educhemia.v7i2.15470

Abstract

This study aims to describe the learning persistence and metacognitive abilities of students through discovery learning models based on blended learning. This research uses a mixed qualitative-quantitative approach with embedded design research. The sample in this study was 50 students of class X MIA, SMA Negeri 4 Jambi City selected by purposive sampling technique. The data collection instruments used were in the form of a study persistence questionnaire, students' metacognitive ability test questions, and interview sheets. The data will be analyzed qualitatively using miles and hubarman and quantitatively analyzed using descriptive statistics and inferential statistics. The inferential statistics performed consisting of assumption tests (normality test, homogeneity test, and linearity test) and hypothesis testing (T test and correlation test). The results of this study indicate that there is a significant difference between learning perseverance and metacognitive ability of students of class XI MIA 1 and class XI MIA 2, with a significance value of 0.011 for student learning persistence and 0.007 for students' metacognitive ability. In addition, it is known that there is a significant correlation between the student's learning persistence variable and the metacognitive ability of class XI MIA students at SMA Negeri 4 Jambi City, which is 0.000.
Patterns of Students' Macroscopic, Submicroscopic, and Symbolic Representation Ability in Acid-Base Topic Mujibaturrahmi Mujibaturrahmi; Sri Winarni; Latifah Hanum
EduChemia (Jurnal Kimia dan Pendidikan) Vol 7, No 2 (2022)
Publisher : Department of Chemical Education Faculty of Teacher Training and Education Universitas Su

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30870/educhemia.v7i2.14250

Abstract

Abstract concepts of chemicals are generally presented in three chemical representation levels: macroscopic, submicroscopic, and symbolic. This study aims to; (1) evaluate each representation ability; (2) determine how to evaluate the pattern of representational abilities; and (3) evaluate the patterns of each student's macroscopic, submicroscopic, and symbolic representation abilities. Qualitative descriptive has been used as the design of this study. Twenty-one multiple-choice questions based on macroscopic, submicroscopic, and symbolic representations have been designed with validation results from two experts, which are 100% valid, and with the Kuder Richardson formula (K-R 20), the reliability value is 0.84. The subjects in this study were all students of class XI MIPA at SMA Negeri 8 Banda Aceh. The research was conducted online via a google form. The results showed that students with high categories of macroscopic, submicroscopic, and symbolic representation skills were 61, 18, and 51%, respectively. 9.8% of students can master the three levels of representation with high criteria. The pattern of representation ability is mainly owned by 24.4% with high macroscopic and symbolic representation abilities but low submicroscopic representation abilities. Because submicroscopic representation lags macroscopic and symbolic, explanation in chemistry should always involve submicroscopic representations other than macroscopic and symbolic.
Testing The Antibacterial Activity of Crude Extracts of Tithonia diversifolia Leaves, Flowers, and Roots in Various Solvent Fraction Indah Tri Susilowati; Hartati Soetjipto; Susanti Pudji Hastuti
EduChemia (Jurnal Kimia dan Pendidikan) Vol 7, No 1 (2022)
Publisher : Department of Chemical Education Faculty of Teacher Training and Education Universitas Su

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30870/educhemia.v7i1.12403

Abstract

Medicinal plants are natural sources of effective antimicrobials from natural products. Tithonia diversifolia (Asteraceae) is a conventional herb that can be used for the treatment of malaria, wounds, and other diseases with biological properties such as antioxidant, antimalarial, antidiabetic, antibacterial, and anti-hyperglycemic. Research on Tithonia diversifolia leaf extract as an antibacterial has been widely carried out. However, its use as a natural antibacterial is rarely studied, especially on flowers and roots. This study aimed to test the antibacterial activity of leaf, flower, and root extracts of the Tithonia diversifolia plant in various solvent fractions. The methods used in this research were Antibacterial Testing with Agar Diffusion and Direct Bioautography Methods, while the solvent fractions used were petroleum ether, chloroform, and ethyl acetate. The results showed that the crude extract of Tithonia diversifolia leaves, flowers, and roots for petroleum ether, chloroform, and ethyl acetate fractions contained antibacterial compounds. They could inhibit the growth of E. coli, P. aeruginosa, S. aureus, and B. subtilis bacteria, with inhibitory activity in chloroform fraction, which was better than in petroleum ether and ethyl acetate fractions. The results of the bioautography test showed that the inhibition was good on gram-positive bacteria with the highest number of spots in the chloroform fraction for the crude leaf and flower extract samples.
Production and Characterization of Natural Acid-Base Indicator of Kendi Belang and Kendi Bukacu for School Chemistry Experiment Fatihah, Wahyu; Zidny, Robby
EduChemia: Jurnal Kimia dan Pendidikan Vol 8, No 1 (2023)
Publisher : Department of Chemical Education Faculty of Teacher Training and Education Universitas Su

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30870/educhemia.v8i1.16541

Abstract

The use of litmus paper seems wastefull and less environmentally friendly because it is only used once. For schlools that have difficulty getting litmus paper it can be a practicum obstacle to determine the acidity of the sample. In order to anticipate this problem, indicator paper was made using extracts of the telang flower (Clitoria ternatea) and the kencana ungu flower (Ruellia simplex) plant extracts. The purpose of the study was to observe the color changes that occurred in acid-base paper indicator namely KENDI BELANG (Kertas Indikator Bunga Telang) and KENDI BUKACU (Kertas Indikator Bunga Kencana Ungu) samples for a certain period of time. Other physical changes such as color, odor, flexibility and paper fibers were also observed. The research used an experimental method for 30 days. Research using experimental method for 30 days. The telang flowers and the kencana ungu are obtained from the environment around the house and then extracted. Whatman filter paper was macerated in plant extracts of telang flower (Clitoria ternatea) and purple golden flower (Ruellia simplex), with the addition of aquades and 70% alcohol as solvent. KENDI BELANG using 70% alcohol solvent produces the best quality indicator paper, because there is no change in color and other physical changes during observation. While less optimal result was found on KENDI BUKACU using distilled water, because the indicator paper produces an unpleasant odor, slightly stiff, and there was a color gradations in some samples of acids and bases.
Correlation Analysis of Radical Polymerization Reactor Operating Conditions to Industrial Scale Swelling Capacity of Superabsorbent Willy Aulia Ilham; Teguh Kurniawan; Saepurahman Saepurahman; Ratna Sari Siti Aisyah
EduChemia (Jurnal Kimia dan Pendidikan) Vol 8, No 2 (2023)
Publisher : Department of Chemical Education Faculty of Teacher Training and Education Universitas Su

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30870/educhemia.v8i1.21201

Abstract

Superabsorbent polymer (SAP) is a polymer that has many functions in modern human’s life, one of which is as an absorbent material in baby diapers. The growing demand for SAP with high quality SAP makes it necessary to study the effects of production variables on the quality of SAP on an industrial scale. The quality of SAP is determined by the number of Swelling Capacity (SC) where the ideal number is greater than 50 g/g. Many previous studies regarding the effect of synthesis parameters on the number of SC of SAP were limited to the laboratory scale where the polymerization conditions were different from the industrial scale. Also the number of variables and SC data obtained from laboratory scale synthesis were limited. The polymerization stage in the reactor with its accompanying operating variables such as reaction temperature, monomer concentration, retention time, crosslinker concentration, addition of nitrogen gas and initiator concentration affects the value of SC in the industrial-scale SAP production process. This study aims to analyse the correlation between the reactor operating conditions and the number of SAP SC obtained. Correlation data analysis was done using microsoft excel with Data Analysis toolpak/ python by utilizing production data with a total of 1,562 entries where the correlation between each variables was calculated using the Pearson’s correlation coefficient. Based on the analysis, it was obtained that the variables that had the strongest correlation with the SC were retention time and reaction temperature with correlation coefficient values of 0.31 and -0.26. The weakest correlation was obtained from the addition of nitrogen gas and an initiator with a value of -0.07 and -0.02. Positive values indicate a relationship that is directly proportional while negative values indicate an inverse relationship. Based on the correlation analyses and trends, the ideal polymerization conditions have been identified.
Physical Stability Evaluation of Cassava Leaf Aqueous Extract Emulgel (Manihot esculenta) Rahman, Havizur; Sari, Indah; Sani, Fathnur
EduChemia: Jurnal Kimia dan Pendidikan Vol 8, No 1 (2023)
Publisher : Department of Chemical Education Faculty of Teacher Training and Education Universitas Su

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30870/educhemia.v8i1.15898

Abstract

Cassava leaves contain various secondary metabolites such as flavonoids and saponins that can be used as anti-inflammatory and antibacterial.This study aims to determine the physical stability of cassava leaf extract emulgel (Manihot esculenta), which can be used as an anti-inflammatory. Emulgel was made in 3 formulas with variations in the concentration of cassava leaf extract, namely 2.5%, 5%, and 7.5%. Emulgel stability tests include organoleptic tests, homogeneity, viscosity, dispersibility, adhesion, and pH. Stability testing using the cycling test method for 12 days of storage at temperatures 4oC and 40oC. This study showed cassava leaf extract can be formulated as emulgel and has good stability after storage at extreme temperatures for 12 days. Emulgel formulations from cassava leaf extract have good stability and can be anti-inflammatory.
Development of Chemical Physics Practicum Module Contextual Learning for Prospective Chemistry Teachers Wijayanti, Imas Eva; Aisyah, Ratna Sari Siti; Andini, Andini; Paridah, Ida; Khoirunnisa, Khoirunnisa; Sutihat, Sutihat
EduChemia: Jurnal Kimia dan Pendidikan Vol 8, No 1 (2023)
Publisher : Department of Chemical Education Faculty of Teacher Training and Education Universitas Su

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30870/educhemia.v8i1.17183

Abstract

Learning chemistry requires practicum which functions to enrich understanding of chemical materials. Practical practice should ideally be carried out in a laboratory as a representative place to produce accurate and precise data using validated practical instructions. This study aims to create a chemistry practicum guide that is designed to be carried out at home with facilities around the house so that it can function to train student independence. This research is a product development research in the form of using model Analyze, Design, Develop, Implement, and Evaluate (ADDIE). The resulting product was validated by 6 material and media expert validators and then tested limited to 15 chemistry teacher candidate students. The results showed that the practicum instructions obtained an Aikens score of 0.9 from the validator, which means they are valid and feasible to try out. Then after conducting trials and student responses, a response of 86% was obtained in the very good category. Based on the values from the validator and limited trials, these practical instructions can be used by prospective Chemistry teachers in teaching in the classroom and at home.

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