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INDONESIA
Jurnal Akademika Kimia
Published by Universitas Tadulako
ISSN : 24775185     EISSN : 23026030     DOI : -
Core Subject : Science, Education,
Chemistry Education
Jurnal Akademika Kimia merupakan jurnal elektronik open access yang bertujuan untuk mempublikasi hasil-hasil penelitian terbaru dalam area pendidikan akademik khususnya pada bidang pendidikan kimia meliputi asesment pembelajaran, model pembelajaran dan pengembangan perangkat pembelajaran, serta kimia murni termasuk kimia organik, kimia anorganik, kimia analitik, kimia fisik, biokimia dan bidang kimia lainnya seperti kimia lingkungan.
Arjuna Subject : -
Articles 8 Documents
 1 
Search results for , issue "Vol 4, No 3 (2015)" : 8 Documents clear
Biocharcoal Dari Kulit Kakao (Theobroma cacao L)Untuk Mengadsorpsi Ion Logam Timbal Pb Podala, Katherina; Walanda, Daud K.; Napitupulu, Mery
Jurnal Akademika Kimia Vol 4, No 3 (2015)
Publisher : Universitas Tadulako

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Abstract

Cacao is a commodity crop growth in the plantation farmers, particularly in Central Sulawesi. Processed of the cocoa fruits are mainly as the food products. Furthermore, the cocoa bark just become rubbish. This study aims to utilize the waste of cocoa bark to be used as biocharcoal to adsorb lead metal ions. The method used was spectrophotometry, where the lead ions concentration absorbed was measured using a Spectrodirect spectrophotometer. The results showed that at the optimum contact time 90 minutes, the lead ion capacity adsorption was 97% and the lead weight adsorbed was 25.26 mg/g. The optimum weight of 60 mg, where the lead ions capacity adsorption was 96.88% and the lead weight adsorbed was 25.22 mg/g. The optimum adsorption capacity was 40 ppm, where the lead ions adsorption obtained was 99.61% and the lead weight adsorbed was 10.84 mg/g.
Pembuatan Bioetanol Dari Biji Durian (Durio zibethinus) Jayanti, Titi; Solfarina, Solfarina
Jurnal Akademika Kimia Vol 4, No 3 (2015)
Publisher : Universitas Tadulako

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Abstract

Durian (durio zibethinus) is a tropical plant which is included in the family Malvaceae. The durian flesh is consumed and the durian seed are waste. The purpose of this study was to process durian seeds as raw material for bioethanol production and to determine the levels of ethanol produced from the durian seeds. Fermentation process in this study was conducted using yeast saccharomyces cerevisiae, NPK and urea fertilizers as the starters. After the starters were incubated for two days, then added to the samples and fermented for 5, 8, 11 and 14 days and then distilled. After distilled, the measured ethanol yield, the reaction, with sodium, water dissolued, gravity, and ethanol pH produced. The results showed that fermentation for 5 days derived ethanol content of l5.15%, density 1.08 g/mL, and the pH 3.35. Fermentation for 8 days derived ethanol content of 4.67%, density 0.98 g/mL, and the pH 3.11. Fermentation for 11 days obtained ethanol content of 5.48%, density 0.99 g/mL, and the pH 3.45. Fermentation for 14 days obtained ethanol content of 2.30%, density 1.00 g/mL, and the pH 3.40. This study concluded that durian seeds can be processed into raw material for producing ethanol by fermentation.fermentationfor 5 days was good compared to the 8, 11 and 14 days with ethanol content of 15.15%.
Analisis Kadar Kalium (K) Dan Kalsium (Ca) Dalam Kulit Dan Daging Buah Terung Kopek Ungu (Solanum melongena) Asal Desa Nupa Bomba Kecamatan Tanantovea Kabupaten Donggala Rahmelia, Deskriana; Diah, Anang Wahid M.; Said, Irwan
Jurnal Akademika Kimia Vol 4, No 3 (2015)
Publisher : Universitas Tadulako

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Abstract

This study aims to determine the levels of potassium (K) and calcium (Ca) in the rind and flesh of the kopek purple eggplant (solanum melongena) fruit. Determination of mineral level was done by destruction of the sample using stong acids, which were nitric acid (HNO3) and perchloric acid (HClO4). The method used in this study was a laboratory experiment using a flame photometry. The results showed that the levels of potassium in the flesh of kopek purple eggplant farmers I and II were 215 ± 7,07 mg/100 g and 195 ± 14,14 mg/100 g, respectively; while the rind of kopek purple eggplant farmers I and II were 142,5 ± 3.53 mg/100 g and 102.50 ± 3.53 mg/100 g, respectively. The levels of calcium in the flesh of kopek purple eggplant farmers I and II were 10 ± 7.07 mg/100g and 15 ± 3.53 mg/100 g, respectively; while the rind of the kopek purple eggplant farmers I and II were 6.25 ± 1.76 mg/100 g and 7.50 ± 3.53 mg/100 g, respectively.
Mind Mapping Dalam Pembelajaran Struktur Atom Pada Siswa Kelas X SMA Negeri 1 Palu Muhamad, Sirhan; Solfarina, Solfarina; Ratman, Ratman
Jurnal Akademika Kimia Vol 4, No 3 (2015)
Publisher : Universitas Tadulako

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Abstract

Teaching and learning is a process involving interaction with active communication between students and teacher in educational activities. Therefore we need a method of learning that is focused to the students. That is why required a learning model that empowers students to be more actively involved in the learning process at schoolis mind mapping. The aim of this study is to describe and determine the differences in use mind mapping in class X SMA Negeri 1 Palu on the subject of atomic structure. The population in this research was class X (n =408 student) academic year 2013/2014. The sample of this research was class X 3 (using mind mapping method) while class X 5 as the control class (using concept maps), both of class have 34 students. Data collected was conducted by instruments, namely test results of studying chemistry at the atomic structure which has been validated before. The examination of data was conducted by using statistical analysis two tailed t-test with the prerequisite tests (normality and homogeneity test). The average score in the experimental class is 77.15 while the average score in control class is 68.44. Based on statistical hypothesis testing to two tailed t-test obtain tcalculation = 10.89 > ttable = 2.00 at α = 0.05 with criteria if Ho is accepted tcalculationttable(1–α), (n1 + n2). As result, H0 is not accepted due to tcalculation was in the rejection area of Ho. This indicates that there are differences in student learning outcomes through the application between the mind mapping and the concept maps methods in class X SMA Negeri 1 Palu.
Pengaruh Mind Mapping Melalui Brain Based Learning Terhadap Hasil Belajar Siswa Pada Materi Ikatan Kimia Di Kelas X MIA SMA Negeri 1 Marawola Purnama, Ririn; Ratman, Ratman; Solfarina, Solfarina
Jurnal Akademika Kimia Vol 4, No 3 (2015)
Publisher : Universitas Tadulako

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Abstract

A research about the influence of mind mapping through brain-based learning in chemical bonding subject on students learning outcomes in class X MIA SMA Negeri 1 Marawola has done. The problem in this research whether there was an influence of mind mapping through brain-based learning to the learning outcomes of students in chemical bonding subject in class X MIA SMA Negeri 1 Marawola. The aim of this study is to determine the influence of mind mapping through brain-based learning in chemical bonding subjecton student learning outcomesin class X MIA SMA Negeri 1 Marawola. This study is a quasi-experiment with purposive sampling. The sample of research consists of two classes, MIA 1, consist of 26 students as a experiment class taught with brain-based learning using mind mapping method and class X MIA 3, consist of 26 students as a control class taugth with brain-based learning using the scientific method. Research results obtained value of x, in the experimental class = 79.30 with a standard deviation = 13.80 and in the control class = 74.30, with a standard deviation = 11.80. From these results, a testing for normality class was done, in the experimental class χ2 value= 4.71 and in the control class χ2 value= 1.85 with the χ2 table = 7.81. The data is normally distributed it as can be seen that both in the experimental class and the controll class χ2 value is less than χ2 table, 4.712.02) in significance level χ = 0.05 and degrees of freedom dk = 50. It can be concluded that the mind mapping through brain-based learning in these experiment class on chemical bonding subject give a positive effect on student learning outcomes in comparison with the control class SMA Negeri 1 Marawola.
Uji Aktivitas Anti Jamur Ekstrak Kayu Manis (Cinnamomum burmanii Blume) Terhadap Jamur Candida Albicans Nuryanti, Siti; Jura, Minarni Rama; Nursucianti, Nursucianti
Jurnal Akademika Kimia Vol 4, No 3 (2015)
Publisher : Universitas Tadulako

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Abstract

Cinnamon contains essential oils those can act as anti-fungal. This study aims to determine the inhibition of fungal growth of cinnamon extract against candida albicans. The study was conducted using a sample of cinnamon extract in some solvents those were distilled water, ethanol, and hexane, and the suspension of the fungus candida albicans which has been synchronized with the MC.Farland standard solution, and performed with pitting method. The results showed that the inhibition of cinnamon extract in hexane against candida albicans fungus was greater than in distilled water and ethanol. Hexane was the most dominant solvent to extract oil contained in cinnamon and some seeds, and also easy to evaporate and separate to produce more essential oils. Based on the observations the percentage of fungal inhibition of cinnamon extracts in distilled water, ethanol, and hexane solvents were, 3.19%, 0% and 100%, respectively.
Identifikasi Zat Warna Rhodamin B Pada Lipstik Yang Beredar Di Pasar Kota Palu Purniati, Ni Ketut; Ratman, Ratman; Jura, Minarni Rama
Jurnal Akademika Kimia Vol 4, No 3 (2015)
Publisher : Universitas Tadulako

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Abstract

Rhodamine B is a synthetic dye used for colouring of paper, textiles and inks. Rhodamine B is able to cause an irritation of the respiratory tract, liver damage and as a carcinogenic substance. The use of dyes aims to obtain more attractive colour. This study aims to identify the rhodamine B on lipsticks in the market in Palu City. The dye was determined using thin layer chromatography (TLC) through qualitative and quantitative tests. The results showed that all lipstick samples were negative containing rhodamine B. Based on qualitative test by TLC did not found similar Rf 0.72 cm confirming the reference solution for rhodamine B, where the value of Rf on consecutive samples were 1A code samples obtained value Rf = 0.58 cm, the sample code 2A obtained value Rf = 0.46 cm, the sample code 3A Rf value = 0.68 cm, the sample code 4A obtained Rf = 0.65 cm, code samples obtained 1B Rf = 0.49 cm, and the sample code 2B obtained value Rf = 0.50 cm. Based on this study it can be concluded that all 6 lipstick samples tested did not contain rhodamine B.
Penerapan Blending Kitosan-Tonasi Terhadap Pertumbuhan Dan Produktivitas Buah Kakao (Theobroma cacao L.) (Studi Wilayah Kabupaten Sigi) Nur Asmara; Suherman Suherman; Siang Tandi Gonggo
Jurnal Akademika Kimia Vol 4, No 3 (2015)
Publisher : Universitas Tadulako

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Abstract

The cocoa (theobroma cacao L.) plant is one of the plantation crops which has an economic potential value. Chitosan and cacao tonnage are potential to be used as nutrients in cacao plant. This research was aimed to use blending chitosan and tonnage dust of cocoa as a suplement in cocoa plant. Method of the research used comparisons of the amount of capsule blending chitosan and tonnage for fertilizing. Comparisons of the blending chitosan tonnage used as the test groups were 16 capsules, 12 capsules, and 8 capsules added by pesticide. As a positive control was the commercial fertilizer with additional of pesticide, and the negative control used only pesticide. Physical observations before and after treatments showed that the test groups and the positive control were able to reduce the amount of tonnage, and improved quality of the skin and the cocoa beans. Each group of 16 capsules, 12 capsules, 8 capsules, positive control and negative control produced weight for every three cocoa beans of 129.25 g, 128.88 g, 96.87 g, 115.22 g, and 44.76 g, respectively. While the cocoa fat level analysis of each sample showed 54.53%, 52.60%, 52.02%, 51.87%, and 48.39%, respectively. It can be concluded that the blending chitosan tonnage increased the productivity and the quality of cocoa beans.

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