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Daud K. Walanda
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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 226 Documents
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Adsorption of Lead(II) Ions using Coconut Fiber’s (Cocos nusifera L.) Activated by Sodium Hydroxide Gatut A. Wardani; Dea D. Pamungkas; Winda T. Wulandari; Fajar Setiawan; Estin Nofiyanti
Jurnal Akademika Kimia Vol. 9 No. 2 (2020)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2020.v9.i2.pp107-110

Abstract

The use of green coconut fiber waste to adsorb lead(II) ions has been successfully carried out. Coconut fiber was activated first using sodium hydroxide before being used as an adsorbent. The optimum time needed for green coconut fiber to adsorb lead(II) ions was 30 minutes with the percentage of ions adsorbed by 94.34%. The lead(II) adsorption kinetics on green coconut fiber model with R2 value of 0.999 and k value of 38.95 x 10-4 minutes-1. Adsorption isotherm from lead(II) on coconut fiber followed the Langmuir adsorption model with R2 value of 0.984 and adsorption capacity of 0.070 g.mg-1.
Determination of Calcium Level (Ca) and Iron (Fe) on Red and Green Spinaches at Parigi Moutong Vina Febriyani; Nurdin Rahman; Ratman Ratman
Jurnal Akademika Kimia Vol. 8 No. 4 (2019)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2019.v8.i4.pp230-235

Abstract

This research aims to determine calcium level (Ca) and iron (Fe) on red and green spinaches at Parigi Moutong. The method used in this research is spectrodirect method. The research result shows that the calcium level (Ca) and iron (Fe) on green spinach was 0.97 mg/kg and red spinach was 58.33 mg/kg at Pelawa village, while the calcium level (Ca) and iron (Fe) on green spinach was 0.62 mg/kg and red spinach was 50.39 mg/kg. From the research results obtained, it can be seen that the level of calcium and iron on red and green spinach in where the red spinach levels higher than the green spinach levels.
Boraxs and Formalin Analysis in the Shumai Treated in Palu City Areeya Milehman; Mery Napitupulu
Jurnal Akademika Kimia Vol. 9 No. 2 (2020)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2020.v9.i2.pp118-124

Abstract

This study aims to test and prove the presence of borax and formalin contamination in shumai samples sold in Palu City. A qualitative method with curcumin paper test; and quantitatively using the UV-Vis spectrophotometer method on a 550 nm wavelength, so that the borax content can be determined in the sample. From the results of this study as many as 5 shumai samples examined, all samples from 5 samples tested qualitatively positive were found before the quantitative analysis was carried out before the samples were tested qualitatively. Qualitative tests showed that some samples did not contain formaldehyde but positively contained borax so the quantitative test was only conducted to determine borax levels in shumai. The results stated that the lowest level was 0.0213 mg/g and the highest level was 0.0314 mg/g.
Esterification of Waste Cooking Oil using Heterogeneous Catalyst from Pearl Shell Iwan Sumarlan; Rona B. Mentari
Jurnal Akademika Kimia Vol. 9 No. 3 (2020)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2020.v9.i3.pp183-190

Abstract

Biodiesel is a renewable and environmentally friendly energy source. The process of using a homogeneous catalyst has several disadvantages, such as: removing a lot of waste water from washing the catalyst residue and cannot be reused. This catalyst is also low in corrosion and is more environmentally friendly. The purpose of this study was to study the preparation of heterogeneous catalysts from pearl shells applied to the cooking oil esterification reaction. The oil was then characterized by the XRD, XRF, SEM, and FTIR. The results of GCMS for reaction without catalysts yield only 27.07% by weight of alkyl ester, whereas using a catalyst is 93.4%. The influence of time, in the 60th minute, was the optimal time for the esterification reaction, and the effect of the weight of the catalyst which was 1% the optimal weight. This shows that pearl oyster shell catalyst can act as an esterification catalyst for used cooking oil and can be used as an alternative to a homogeneous catalyst substitute catalyst.
The Influence of Experiental Learning Model Assisted Experiment on Material Electrolyte and Non-electrolyte Solutions toward the Learning Outcome of Students Class X MIA at SMA Negeri 3 Palu Yonathan Banua; Sri M. Sabang; Vanny M. A. Tiwow
Jurnal Akademika Kimia Vol. 9 No. 1 (2020)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2020.v9.i1.pp1-6

Abstract

This research focused on the influence of the experiential Learning Model Assisted Experiment on material electrolyte and non-electrolyte solutions toward the learning result of science students class X MIA at SMA Negeri 3 Palu. This research used quasi-experimental with a control group research design using pre-test and post-test. The population was all of science students class X MIA at SMA Negeri 3 Palu registered in the 2016-2017 academic year. The purposive sampling was used in choosing the sample. The sample in this research was the students of experiment class (n = 32) and control class (n = 32). The statistic data used a one-party t-test with a prerequisite test: normality and homogeneity test. Based on the result of hypothesis testing, it showed that tcounted > t1-α (tcounted = 3.35 and ttable = 1.67) with the level of significance a = 0.05 and degree of freedom 61, as the result H0 was rejected and H1 was accepted, means there was a significant difference between experimental group and control group. Therefore it can be concluded that there was an influence of experiential learning model-assisted experiments on material electrolyte and nonelectrolyte solutions toward the learning result of chemistry students X MIA at SMA Negeri 3 Palu.
Utilization of Extract of Sambang Getih Leaves (Hemigraphis colorata. Hall. F) as a Acid-Base Indicator Eksari Ekasari; Purnama Ningsih
Jurnal Akademika Kimia Vol. 9 No. 1 (2020)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2020.v9.i1.pp7-15

Abstract

Getih sambang leaves (Hemigraphis Colorata. Hall. F) are plants that have a distinctive and unique color, namely the upper surface of the leaf is green and the bottom of the leaf is burgundy where sambang leaves contain anthocyanin compounds. Anthocyanin is the color pigment in plants that forms the basis of the use of natural indicators. This study aims to prove whether getih cucumber leaves can be used as an acid-base indicator, to determine the type of acid-base titration that is suitable for indicators of getih cucumber leaves, and to find out what the pH-changing color route of getih cucumber leaves is. The method used is extraction, namely maceration. Wee leaves are macerated by using methanol as a solvent for 24 hours. The extract was previously tested using HCl solution and NaOH solution as a test to prove the presence of anthocyanin. The results obtained in this study, getih sambang leaf extract can be used as an indicator of acid base, and also the type of acid-base titration that is suitable for use in the indicator of getih leaf extract extract precisely on the titration of strong-base strong acid, and strong weak base-acid It is best used as a substitute for the phenolphthalein indicator. In titration of strong and weak acids and bases, it is good to be used as a substitute for the indicator of methyl orange. The pH range obtained from the getih sambang leaf extract is pH 4-7 (red-purple).
Determination of Iron (Fe) and Copper (Cu) on Pellets from Fermentation of Mozambique Tilapia (Oreochromis mossambicus) using Goat Dirt Adhesives Verren T. M. Pariama; Paulus H. Abram
Jurnal Akademika Kimia Vol. 9 No. 1 (2020)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2020.v9.i1.pp16-21

Abstract

Tilapia fish waste and livestock manure are an environmental problem, besides being smelly pollution will also cause disease disorders for humans. The purpose of this study was to determine the levels of micronutrients of iron (Fe) and copper (Cu) on pellets from the fermentation of waste tilapia (oreochromis mossambicus) using adhesive goat manure. Fish waste was fermented for 15 days and mixed with adhesive goat manure and then was processed in a pellet making machine. The Fe and Cu levels were determined using Atomic Absorption Spectrophotometer (AAS). The results of the determination of levels Fe was 137 ppm and for Cu was 4.1 ppm.
The Intuitive Thinking Ability of Students of Grade XI Science at SMA Negeri 4 Palu through the Implementation of Discovery Learning Model on Colloidal Material Muh. F. I. Ote; Paulus H. Abram; Purnama Ningsih
Jurnal Akademika Kimia Vol. 9 No. 1 (2020)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2020.v9.i1.pp22-26

Abstract

This study aimed to describe the intuitive thinking ability in Grade XI SMA Negeri 4 Palu through the implementation of discovery learning model on Colloidal material. This study was a One-Shot Case Study design. The population of this study was all students of grade XI Science at SMA Negeri 4 Palu, and the sample was Class XI Science 3 as the replication class 1 and class XI Science 6 as the replication class 2. The results obtain the intuitive thinking ability of replication class 1 is that the students who solved the problem with a reasonable answer, that is 86.43% in the very high category. Students who solved problems using prior knowledge and experience, that is equal to 77.14% in the high category, and students who solved problems based on generalization of examples or concepts, that is 84.46% in the very high category. While the intuitive thinking ability of replication class 2 is that the students who solved problems with a reasonable answer is 52.85%, in the medium category. Students who solved problems using prior knowledge and experience, that is equal to 76.42% included in the high category, and students who solved problems based on generalization of examples or concepts that is equal to 83.92% in the very high category.
The Effect of PQ4R (Preview, Question, Read, Reflect, Recite, Review) Learning Method with Internet-Assisted on Learning Outcomes of Students SMA Labschool UNTAD Palu on Salt Hydrolysis Ersa W. Lakukua; Mery Napitupulu; Afadil Afadil
Jurnal Akademika Kimia Vol. 9 No. 1 (2020)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2020.v9.i1.pp27-33

Abstract

This study aimed to describe the effect of PQ4R learning methods with internet-assisted on students’ learning outcomes of class XI SMA Labschool UNTAD Palu on salt hydrolysis material. The type of research was quasi-experimental with a nonrandomized pretest-posttest control group design. This study was conducted with two groups, namely the XI IPA class 1 as the experimental group (n = 21) and the XI IPA class 3 as a control group (n = 23). The testing of the research data used a two-party t-test statistical analysis. The results of data analysis obtained that the average of an experimental class was 63.19 with a standard deviation of 7.37 and a control class was 57.22 with a standard deviation of 8.19. The results of testing the hypothesis with the two-party t-test statistics obtained -ttable<tcount> +ttable (tcount 2.54 and ttable 1.68) with a significance level (α) = 0.05 and degrees of freedom (dk) = 35. Based on the results testing of the hypothesis, it can be concluded that H0 was rejected and H1 was accepted. This means that the PQ4R learning method with internet-assisted has a positive effect on the learning outcomes of students class XI SMA Labschool UNTAD Palu.
Emulsion Stability Tes and Effect of HNO3 Concentration in the Internal Phase on Cadmium Ion Extraction using Liquid Membrane Emulsion Technique Sahida Sahida; Baharuddin Hamzah; Siti Nuryanti
Jurnal Akademika Kimia Vol. 9 No. 1 (2020)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2020.v9.i1.pp34-39

Abstract

Study on the emulsion stability and cadmium ion extraction tests was performed using the liquid membrane emulsion technique. This study aimed to determine the emulsion stability between the membrane phase and the internal phase with the variation of the ratio (2:1, 1:1, 2:3, and 1:2), and to determine the maximum conditions of cadmium ion extraction in a solution including the various concentration of HNO3 solution 1, 1.5, 2, and 2.5 M. This study is a laboratory experimental method using benzoyl acetone compound as cation carrier, kerosene as membrane phase, HNO3 solution as the internal phase, span-20 and span-80 as surfactants, and cadmium solution as the sample solution. Cadmium ion concentration in the external phase was determined by UV-VIS spectrophotometer. The result showed that the emulsion stability test which produced the most stable emulsion was in the ratio of the membrane phase and the internal phase 1:1. In addition, the concentration of the HN03 solution resulted in a maximum extraction percentage of 1.5 M with an extraction percentage was 95.28%.

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