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INDONESIA
Jurnal Pendidikan Kimia (JPKim)
Published by Universitas Negeri Medan
ISSN : 20853653     EISSN : 25493116     DOI : 10.24114
Core Subject : Science, Education, Social,
Biochemistry, Genetics & Molecular Biology Chemistry Education Environmental Science
Jurnal Pendidikan Kimia (JPKim) yang dikelola Program Pascasarjana Universitas Negeri Medan terbit 3 kali setahun, yakni bulan April, Agustus dan Desember. JPKim menerbitkan artikel ilmiah hasil-hasil penelitian pendidikan kimia dan kimia fundamental. JPKim juga menerbitkan artikel Review terkait Pendidikan Kimia dan Kimia.
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Articles 16 Documents
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Search results for , issue "Vol 15, No 3 (2023): December" : 16 Documents clear
Formulation and evaluation of liquid soap preparation of robusta green coffee extract (Coffea canephora) with virgin coconut oil (VCO) base as an antibacterial Staphylococcus aureus Ing Mayfa Br Situmorang; Feronika Evma Rahayu; Opi Dwi Nurhayati
Jurnal Pendidikan Kimia (JPKIM) Vol 15, No 3 (2023): December
Publisher : Pascasarjana Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/jpkim.v15i3.50078

Abstract

Staphylococcus aureus can be found on the surface of the skin. One way to prevent Staphylococcus aureus on the skin is to clean the skin with soap. Liquid soap effectively removes dirt from the skin surface and protects the skin from bacteria. Determining the robusta green coffee bean extracts (Coffea canephora) appropriate activity was the study’s major aim in a liquid soap that complies with SNI 06-4085-1996 for use as an antibacterial agent and meets the physical quality requirements for liquid soap preparations. The extraction is performed by a soxhlet extraction method with 96% ethanol. The results of the organoleptic test show a difference in color at each concentration, with the concentration of the extract, which is higher, affecting the color and odor, the results of the homogeneity show results that are homogeneous and free of coarse grains, the results of the pH test show results that meet the requirements, namely in the interval 8-11, the results of the viscosity show results that meet the SNI requirements of 400-4000Cps, the results of the foam height test show stable results and meet the SNI requirements of 13-220 mm. the results of the inhibition zone in the liquid bath soap preparation of robusta green coffee bean extract using the disk diffusion method show that F0 = 4.51mm (resistant), F1 = 11.11mm (resistant), F2 = 13.35mm (intermediate) and F3 = 20.57mm (suspicious).Keywords: Coffea canephora; Disc diffusion; Liquid soap; Staphylococcus aureus
The effect of calcium oxide addition from feather clam shells on porosity and water adsorption geopolymer composite bricks Nurfajriani Nurfajriani; Yohansen Wahyudi
Jurnal Pendidikan Kimia (JPKIM) Vol 15, No 3 (2023): December
Publisher : Pascasarjana Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/jpkim.v15i3.50903

Abstract

The purpose of this study was to study the effect of adding CaO (calcium oxide) from clam shell ash on physical properties such as density, porosity and water absorption on geopolymer composite bricks. Geopolymer composite bricks are made by mixing sand, geopolymers synthesized from fly ash with NaOH and Na2SiO3 and calcium oxide calcined from feather clam shell which is printed in cylinder form. The bricks are then cured for 28 days and physical tests are carried out in the form of density, water absorption and porosity tests. The results showed that the most optimal addition of CaO is 7.5% for the physical properties of geopolymer composite bricks with a density value of 1.80 gr/cm3, a porosity value of 10.30% and a water absorption capacity of 4.68%. The value has filled the quality standard 1st for bricks set by Indonesian National Standard (SNI).Keywords: Calcium oxide; Composite bricks; Fly ash; Geopolymer
Development of ethnoscience-based student worksheets of redox reactions, volta cells, and corrosion using liveworksheets Liana Vinca Rosea Cristy; Fransisca Ditawati Nur Pamenang
Jurnal Pendidikan Kimia (JPKIM) Vol 15, No 3 (2023): December
Publisher : Pascasarjana Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/jpkim.v15i3.51211

Abstract

Learning about ethnoscience can help students better understand chemistry because it connects to their daily experiences. However, students often struggle with redox and electrochemical concepts due to a lack of appropriate learning materials and difficulty grasping these ideas. This research aims to achieve the following objectives: (1) develop ethnoscience-based student worksheets on redox reactions, Volta cells, and corrosion using Liveworksheets, following the 4D development model modified to 3D; (2) create ethnoscience-based student worksheets on these topics that are valid, effective, and practical. The research employed validation sheets and questionnaires as instruments, with a sample of six students from the 12th grade. Data was analyzed descriptively. The results indicate that (1) the modified 4D development model was suitable for creating the student worksheets due to its systematic stages and adaptability to researchers' needs; (2) both the media and material showed high validity percentages, averaging 88% and 89%, respectively. The worksheets were considered quite effective, with an average percentage of 66%, and practical, with an average percentage of 78%. Overall, the developed product can be effectively used to teach redox reactions, voltaic cells, and corrosion in chemistry using Liveworksheets.Keywords: Corrosion; Ethnoscience; Redox reaction; Students’ worksheets; Voltaic cell
Feasibility study of concentration of chemical and physical parameters in excavated water coal mining as a cage fishing destination Saibun Sitorus; A. Khafifah Dwi Rachmat
Jurnal Pendidikan Kimia (JPKIM) Vol 15, No 3 (2023): December
Publisher : Pascasarjana Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/jpkim.v15i3.50939

Abstract

A research was carried out on the feasibility of chemical and physical concentrations in coal mine excavation water for use in cage fisheries. This research aims to analyze the concentration conditions of chemical parameters (NH3, pH, Cu and Fe) and physical parameters (DO, temperature and turbidity) in water originating from coal excavations which are already in the form of lakes. Samples were prepared before analysis by adding concentrated nitric acid. Analysis of Cu and Fe concentrations was carried out using an Atomic Absorption Spectrophotometer (AAS), ammonia using a UV-Vis Spectrophotometer, DO concentrations were analyzed using the titration method, turbidity analysis using a nephelometer, temperature using a thermometer and pH using a pH meter. From the research results, it was found that the physical parameters of lake water from former coal mine excavations were pH, temperature, DO, NH3 and turbidity is suitable because it has not yet passed the quality standards for designation as a cage for cultivating freshwater fish. The concentration of the heavy metal Cu in coal excavation water has exceeded the quality standards set for cultivating freshwater fish and the metal concentration Fe has not exceeded the quality standards set. Research analysis of the average concentrations of heavy metals in water samples from former coal mining pools, namely Cu (0.166; 0.278; 0.284 mg/L), and Fe (0.020; 0.029; 0.023 mg/kg).Keywords: Cages; Chemical; Physical parameters; Pools of former coal mines
Synthesis of silver nanoparticles as a reagent for colorimetric detections of creatinine Yusnaidar Yusnaidar; Martina Asti Rahayu; Yolanda Wulandari
Jurnal Pendidikan Kimia (JPKIM) Vol 15, No 3 (2023): December
Publisher : Pascasarjana Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/jpkim.v15i3.51216

Abstract

In this study, Silver Nanoparticles (AgNPs) was synthesized using natrium citrate as a stabilizing agent and ascorbic acid as a reducing agent. The aim of this study is to investigate the optimum condition of creatinine colorimetric detection using silver nanoparticle synthesized. The reaction was carried out at temperature within an alkaline environment with a pH of 10,5. The concentration of reducing and capping agent showed a significant effect to absorption spectra via UV-Vis spectrophotometer. The produced citrate-capped AgNPs exhibited SPR absorbance within the range of 390–410 nm. The detection mechanism relies on the aggregtion of nanoparticles with analytes, resulting in a shift in Localized Surface Plasmon Resonance (LSPR) towards a longer wavelength. The experiment showed that the pH condition of the medium played an essential part in the interaction between creatinine and silver nanoparticles (AgNPs). Development of creatinine detection methods is based on the ability of tautomerization of creatinine to its anionic amino species at alkaline pH led to cross-linking with the negatively charged AgNPs through hydrogen bond networks, facilitating the aggregation mechanism. This aggregation resulted in particle resulted a color shift from yellow (with a maximum wavelength of 403nm) to dark blue (with a maximum wavelength of 670 nm) within 5 minute of reaction at pH 12. With this strategy, a linear relationship between the A670/A403 extinction ratio and creatinine concentrations was obtained in the range of 10–50μM with a coefficient of determination of 0.935.Keywords: Aggregation; Citrate; Creatinine; Silver nanoparticle; Surface plasmon
The evaluation of biochemistry practicum based on several parameters of laboratory services in chemistry department Universitas Negeri Surabaya during the even semester Mirwa Adiprahara Anggarani; Dzikra Nasyaya Mahfudhah; Soesilowati Soesilowati; Avissa Auryn Wijayanti; Syananda Zahra Fadila; Nuniek Herdyastuti; Muhammad Nurrohman Sidiq
Jurnal Pendidikan Kimia (JPKIM) Vol 15, No 3 (2023): December
Publisher : Pascasarjana Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/jpkim.v15i3.47646

Abstract

This study was conducted to evaluate laboratory management during biochemistry practicum activities and to build laboratory information for the internal and external community of Universitas Negeri Surabaya (Unesa) in 2023 through several aspects, namely infrastructure, tools, materials, and PLP/laboratory services. A descriptive-qualitative approach is used with a questionnaire for all biochemistry practitioners. The result shows that all aspects of biochemistry practicum activities obtain percentages sequentially of 89%, 90%, 93%, and 90%, which are included in the excellent category, so it can be concluded that all practitioners are highly satisfied with laboratory services during practicum. However, improvements to the deficiencies still need to be made so that the following practicum activities run better and optimally.Keywords: Biochemistry practicum; Evaluation; Laboratory management; Laboratory services

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