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Retno Dwi Suyanti
Universitas Negeri Medan, Medan 20221, Indonesia
Biochemistry, Genetics & Molecular Biology Chemistry Education Environmental Science

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Analysis of constraints and innovation of chemistry experiment implementation in high school in Deli Serdang, Indonesia Fathia Namira; Wan Azura; Ayu Miranda; Hamidatun Nisa; Saronom Silaban; Retno Dwi Suyanti; Ayi Darmana
Jurnal Pendidikan Kimia (JPKim) Vol 12, No 3 (2020): December
Publisher : Pascasarjana Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (287.642 KB) | DOI: 10.24114/jpkim.v12i3.21159

Abstract

Practical activities play an important role in science education. Through it, students develop a deeper understanding of standing theoretical concepts, skill, utilization of technology, and methods for investigation with direct manipulation of related materials. Effective use of laboratories is one of the requirements in learning chemistry, especially in experiment material. However, problems that are often encountered in learning in the laboratory are laboratory management which includes the procurement process, application process, and the maintenance process. The research method used was observation, document recording and interview with all chemistry teachers and students at Labuhan Deli Senior High School and Percut Sei Tuan Senior High School, District of Deli Serdang, Indonesia. Stages in the research of this are (1) observation based on National Education Standards, (2) observation of chemistry experiments implementation, (3) observation of constraint and problems laboratory at school, and (4) determine alternative solution. The result showed that area of chemistry laboratory has suitable with BSNP standart, but the standard of facilities and infrastructure category reference scale (PAP), showed less category results. So the settlement by researchers on this problem is to do a simple practicum that can be done in an open space or using the technology (virtual laboratory) to increase the students’ skill in industrial 4.0.Keywords: Chemistry experiment, Laboratory, Facilities, Simple practicum, Technology
Analysis of constraints and alternative solutions to the implementation of chemical practicums in several high schools in Medan Gusti Rahman; Rizki Fitriani Nasution; Alfi Rizkina Lubis; Putri Novira; Lusyana Rahman; Ester Hartina Ria Sinaga; Puan Ibna Maghfirah Thaharah; Sri Nur Afrida; Retno Dwi Suyanti; Ayi Darmana; Saronom Silaban
Jurnal Pendidikan Kimia (JPKim) Vol 12, No 1 (2020): April
Publisher : Pascasarjana Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (295.445 KB) | DOI: 10.24114/jpkim.v12i1.17744

Abstract

The laboratory is a place to train students' skills in conducting demonstration, experimental and scientific development practices. The provision of complete laboratory tools and materials and good laboratory management will make learning chemistry run optimally, but some high schools still do not meet the standards of facilities and infrastructure in the laboratory. Therefore, the researcher tries to collect the problems and constraints in the implementation of the practicum and find alternative solutions to the problem solving based on literature review and expert opinion. This research is a qualitative study which is a case study research in several high schools in Medan. The instruments in this study were student questionnaire, teacher questionnaire, principal questionnaire and observation sheet using Likert scale analyzed using the percentage formula. the results of the analysis of case studies conducted in a number of high schools in Medan, it can be concluded that, the area of chemistry laboratories in several schools in Medan meets BSNP standards, but there are still science laboratories used for chemical laboratories. The results of the analysis of equipment and materials that support the implementation of the practicum after the presentation of X1 schools 76.36%, X2 schools 65.67% and X3 schools 87.27%. Keywords: Chemistry laboratory; Practicum; Equipment
Effectiveness of sulfuric acid and hydrochloric acid catalysts in the esterification of frankincense cinnamic acid with ethanol and methanol Marham Sitorus; Retno Dwi Suyanti; Iis Siti Jahro; Suria Bersinar Siahaan; Innovayani Saragih; Francisca T. A Sitorus
Jurnal Pendidikan Kimia (JPKIM) Vol 16, No 1 (2024): April
Publisher : Pascasarjana Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/jpkim.v16i1.53231

Abstract

This research aims to compare the effectiveness of sulfuric acid and hydrochloric acid catalysts in the esterification of frankincense cinnamic acid (STYRAX paraleoncomud PERK). Esterification of sulfuric acid catalyst is carried out with ethanol and for hydrochloric acid catalyst with methanol. Esterification was carried out by refluxing a mixture of 1:20 cinnamic acid - ethanol and methanol, with 3 mL of each catalyst at a temperature of 60oC for one hour. The results were rinsed with 3 x 50 mL distilled water and dried with anhydrous sodium sulfate. The results were filtered and verified for functional groups using FTIR and composition analysis using GC – MS. The results of FTIR interpretation show a decrease in absorption intensity (-OH) at 3500 cm-1 as a functional group that reacts compared to the ester results as an indication of the ongoing esterification reaction. The resulting ethyl cinnamate has a high conversion of 84.42%. Methyl cinnamate also has a distinctive ester aroma but is clearer and based on GC-MS, the content of methyl cinnamate is relatively low, namely 34.40%, the remaining cinnamic acid is 37.28%, and various side products of 28.32%. Thus, the catalyst that provides better conversion is sulfuric acid, but it requires further purification by examining the appropriate absorbent and bleaching agent. The brown color of the ester product catalyzed by sulfuric acid is thought to occur due to the oxidation of the cinnamic acid double bond by the catalyst.
Co-Authors Alfi Rizkina Lubis Ayi Darmana Ayu Miranda Ester Hartina Ria Sinaga Fathia Namira Francisca T. A Sitorus Gusti Rahman Hamidatun Nisa Iis Siti Jahro Innovayani Saragih Lusyana Rahman Marham Sitorus Puan Ibna Maghfirah Thaharah Putri Novira Rizki Fitriani Nasution Saronom Silaban Sri Nur Afrida Suria Bersinar Siahaan Wan Azura