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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 240 Documents
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PENGARUH ION KROMIUM(III) PADA EKSTRAKSI ION TEMBAGA(II) MENGGUNAKAN EMULSI KEROSEN DENGAN 1-FENIL-3-METIL-4-BENZOIL-5-PIRAZOLON SEBAGAI PEMBAWA KATION Hamzah, Baharuddin; Said, Irwan; Hardani, Ririen
Jurnal Akademika Kimia Vol 2, No 3 (2013)
Publisher : Universitas Tadulako

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Abstract

The influence of chromium(III) ion on copper(II) ion extraction using kerosene emulsion with 1-phenyl-3-methyl-4-benzoyl-5-pyrazolone (HPMBP) as a cation carrier was investigated. The optimum condition for copper(II) extraction were as follows: concentration of mixed surfactant (span 80+span 20) was 5%, volume ratio of kerosene and internal phase was 1, concentration of HPMBP was 0.025 M, concentration of HCl was 1 M, volume ratio of emulsion and external phase was 0.143. The results showed that the extraction of copper(II) ion was selective to chromium(III) ion, relatively. The result also showed that the presence of 500 ppm chromium(III) ion decrease the percentage of copper(II) ion extraction from 98.6 to 91.0.
ANALISIS SENYAWA ALKALOID DAUN TANAMAN JOHAR (Cassia siamea Lmk.) YANG BERPOTENSI SEBAGAI INSEKTISIDA PADA NYAMUK Setiawan, Topan; Aminah, Sitti; Jura, Minarni R.
Jurnal Akademika Kimia Vol 2, No 3 (2013)
Publisher : Universitas Tadulako

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Abstract

Research about alkaloid compound of johar plant leaf (Cassia siamea Lmk.) which potential as insecticide at mosquito. The methods are used is laboratory experiment from johar plant leaf extract. Alkaloid has product from separated extract of johar plant leaf. Maximum wave has product by UV-Vis spectrophotometer is 306 nm. TLC product of johar plant leaf extracts are 2 components (Rf 0.89 and 0.91). TLC product of johar plant leaf alkaloid is 1 component (Rf 0.91). The product of HPLC showed 4 components for johar plant leaf and 2 components for alkaloid. The insecticide force of 25 mosquitos did by third for extract and alkaloid. The products are johar leaf extract have insecticide force for each treatment are 14, 10 and 14 mosquitos although alkaloids are 13, 8 and 2 mosquitos.
Pembuatan Bioetanol Dari Biji Salak (Salacca edulis) Melalui Fermentasi Anggraeni, Yuni; Supriadi, Supriadi; Mustapa, Kasmudin
Jurnal Akademika Kimia Vol 6, No 3 (2017)
Publisher : Universitas Tadulako

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Abstract

Salak seed is a waste of salak fruit that contains a high carbohydrate, therefore it can be used as an alternative raw material for the production of bioethanol. The study aims to determine the optimum time of fermentation to produce the highest content of bioethanol and to determine the weight ratio of the yeast and the substrate that produce the highest content of bioethanol. Variations of yeast mass used was 2, 4, and 6 grams and fermentation time were 24, 48, 72, 96, 120, and 144 hours. The analysis showed that the highest content of bioethanol produced was 6 grams of the yeast mass, the fermentation time was 48 hours and the weight ratio of yeast to the substrate was 6: 10 that obtained 11.2%.
Analisis Perbedaan Kadar Vitamin C Buah Naga Merah (Hylocereus polyrhizus) Dan Buah Naga Putih (Hylocereus undatus) Yang Tumbuh Di Desa Kolono Kabupaten Morowali Provinsi Sulawesi Tengah Risnayanti, Risnayanti; Sabang, Sri Mulyani; Ratman, Ratman
Jurnal Akademika Kimia Vol 4, No 2 (2015)
Publisher : Universitas Tadulako

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Abstract

This study aims to determine the differences of vitamin C levels contained in the red dragon andwhite dragon fruits. The flesh and the skin of the dragon fruits were used as the samples and the fruitswere taken from Kolono Village, Morowali. Analysis of vitamin C levels in the samples was done byiodine titration method using starch solution as an indicator. The results showed that vitamin C levelsin the skin of red dragon fruit was 4.04 mg/100 g, while in the flesh was 5.28 mg/100 g. Levels ofvitamin C in the skin of white dragon fruit was 7.56 mg/100 g, while in the flesh was 7.92 mg/100g. The data indicate that vitamin C levels in the flesh and the skin of white dragon were higher thanvitamin C levels in the flesh and the skin of red dragon fruit. It can be seen that both of fruits havedifferent vitamin C levels.
PENGGUNAAN MODEL PEMBELAJARAN LEARNING CYCLE BERBASIS PETA KONSEP PADA MATERI KESETIMBANGAN KIMIA UNTUK MENINGKATKAN HASIL BELAJAR SISWA KELAS XI SMA NEGERI 1 DAMPELAS KABUPATEN DONGGALA Astuti, Ni Luh Murni; Tangkas, I Made; Supriadi, Supriadi
Jurnal Akademika Kimia Vol 2, No 4 (2013)
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Abstract

Student learning outcomes will be better if the experience for themselves what really happened. They will continue to remember the events that ever happened; therefore we need a method of teaching that is oriented to students. The purpose of this research is to improve learning outcomes chemistry of students class XI at SMA Negeri 1 Dampelas using learning cycle model base map concept in equilibrium topic of chemical. The Population of this research was all students in class XI SMA Negeri 1 Dampelas which consists of 4 classes. The sample was taken 2 classes with purposive sampling technique, which are class XI IPA 2 as much as 32 students as the experiment and class XI IPA 1 as much as 32 students as the control class. Research data collection was done by using a test instrument in the form of test results of chemical equilibrium. Testing research data using statistical analysis of t-test the right side and prerequisite test is homogeneity and normality test. The median score of student learning outcomes using learning cycle methods is 17.18 while median score of student learning outcomes with conventional learning is 14.25. Based on the calculation of the t test statistic obtained t_calc= 3.71, this show that in the region of rejection H_0 is 2.00. It can be concluded that there is an increase student learning outcomes with learning cycle model base map concept than students’ conventional teaching of class XI IPA SMA Negeri 1 Dampelas on the subject of chemical equilibrium
Pengaruh Penerapan Model Pembelajaran Kooperatif Tipe Scramble Terhadap Hasil Belajar Siswa Pada Materi Hidrokarbon di Kelas X SMA Negeri 8 Palu Suliadi, Ilham; Said, Irwan; Jura, Minarni Rama
Jurnal Akademika Kimia Vol 6, No 4 (2017)
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Abstract

This study aimed to obtain description in application the cooperative learning model type scramble on student’s learning outcomes in hydrocarbon material in class X SMAN 8 Palu. This type of research was quasi-experimental research. This study was conducted at two group, 27 students in class XB as an experimental group and 28 students in class XA as a control group. The testing of student’s learning outcomes data used the statistical analysis t-test of the two parties with the prerequisite test: normality test and homogeneity test. The results of the data analysis, it was obtained the average values of students in experiment class () was 72.40 with a standard deviation of 11.86 and students in control class () was 67 with a standard deviation of 12.03. Based on the results of testing hypotheses by statistical t-test two parties, it was obtained –ttable­<tcalculation> +ttable (tcalculation=2.37 and ttable=1.67)  with a significance level α = 0.05 and degrees of freedom 53, then H0 was rejected and ha was accepted. It can be concluded that there is the effect of applying the cooperative learning model type scramble toward student’s learning outcomes in the hydrocarbon material in class X SMA 8 Palu.
Penggunaan Gel Lidah Buaya (Aloe vera) Sebagai Koagulan Alami Dalam Penjernihan Air Sumur Di Desa Sausu Tambu Kecamatan Sausu Mujariah, Mujariah; Abram, Paulus Hengky; Jura, Minarni Rama
Jurnal Akademika Kimia Vol 5, No 1 (2016)
Publisher : Universitas Tadulako

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Abstract

Research on the use of aloe vera gel (aloe vera) as a natural coagulant in water purification village wells Sausu Tambu has been done. This study aims to determine whether aloe vera gel can be used as a natural coagulant and determine the optimum ratio of aloe vera gel in water (V/V) which is used in the purification of water wells in the village Sausu Tambu. Research was conducted on the water sample preparation, natural production of aloe vera gel, water treatment and analysis of water quality parameters, namely turbidity, hardness, color, pH and temperature. The results showed that aloe vera gel can be used as a coagulant to purify the water with an optimum ratio of 0.3 mL aloe vera gel in 500 mL water sample. Aloe vera gel can reduce 72.22% of turbidity, 63.48% hardness, 68.62% color with a pH of 5.5 and a temperature of 30 oC. It can be concluded that the aloe vera gel has the ability as a coagulant to purify water.
PENGGUNAAN QR CODE DALAM PEMBELAJARAN POKOK BAHASAN SISTEM PERIODIK UNSUR PADA KELAS X SMA LABSCHOOL UNTAD Mustakim, Sartika; Walanda, Daud K.; Gonggo, Siang Tandi
Jurnal Akademika Kimia Vol 2, No 4 (2013)
Publisher : Universitas Tadulako

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Abstract

Utilization of information technology in particular a QR code in education is still lacking. Therefore the reseacher is examining the QR code in the chemistry learning. Teaching and learning activities in the classroom are still dominated by teachers, meanwhile students seem expect more aids from their peers in performing the task. which due to a number of student are still lack of confidence in completing their tasks. In this study, the researchers use the QR code in the learning of periodic table topics regarding properties of elements. The problem statement was wether the learning outcomes of student who involved in the learning using QR code are better than student who take lessons without involving the use of QR code. The number of student in class X science Labschool Untad for 2013/2014 academic year are 22 student in experimental classroom and 22 student in control classroom which are determined by purposive sampling. Based on the results, it is concluded that the learning outcomes of students who took lessons with the use of QR code is higher than the learning outcome of students who took the lessons without involving the use of QR code for student in class X SMA Labschool Tadulako University.
Analisis Tembaga (Cu) Dan Timbal (Pb) dalam Air Laut dan Sedimen di Perairan Pantai Loli Kecamatan Banawa Kabupaten Donggala Santi, Santi; Tiwow, Vanny M. A.; Gonggo, Siang Tandi
Jurnal Akademika Kimia Vol 6, No 4 (2017)
Publisher : Universitas Tadulako

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Abstract

This study aimed to determine the concentration of heavy Cu and Pb in seawater and sediment in coastal waters Loli subdistrict Banawa, district Donggala. The method used was destruction and using Atomic Absorption Spectrophotometer (AAS) instrument.Samples of seawater and sediment were taken by two sampling points. Samples were destructed by using a solution of HNO3 and HClO4with ratio 4: 1. Levels were measured at a wavelength of 325.7 nm for Cu and 217 nm for Pb. The analysis result obtained that the levels of Pb in the seawater in the range of 0,531-0.671 mg/L, while for Cu in the range of 0.009-0.090 mg/L it can be concluded that the levels of Pb and Cu in seawater has exceeded the levels were of 0,008 mg/L. For sediment samples obtained that Pb levels were around 1,78-7,73 mg/kg while for Cu 15.86-68.88 mg/kg so Cu in sediment was up to 30 mg/kg while the levels of Pb did not exceed the tolerance limits of 33 mg/kg.
Adsorpsi Logam Timbal (Pb) dari Larutannya dengan Menggunakan Adsorben dari Tongkol Jagung Ningsih, Dwi Arista; Said, Irwan; Ningsih, Purnama
Jurnal Akademika Kimia Vol 5, No 2 (2016)
Publisher : Universitas Tadulako

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Abstract

Heavy metals will cause environmental problems. One of the efforts that can minimize level of heavy metal from their solutions is to reduce heavy metals content, so that safely discarded at sea/river. One such way to reduce level of heavy metals is by adsorption. Some agricultural waste are potential as an adsorbent, namely a corncob. Therefore, the aim of this study is to determine the optimum weight of adsorben from corncob to absorb Pb(II) from its solution. In this study, the corncob was used as an adsorbent to adsorb Pb(II) by using three methods, namely powder, charcoal and activated charcoal with a solution of HCl. The parameters tested were amount of adsorbent or weight of the powder, charcoal and activated charcoal by the weight variation of 20, 40, 60, 80 and 120 mg to determine the optimum conditions in adsorbing Pb(II). The optimum conditions are obtained for the powder was 80 mg with the absorption of 96.92%, the charcoal is 80 mg with absorption of 97.29%, and the activated charcoal was 40 mg with the absorption of 94.70%.

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