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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 1 (2015)" : 8 Documents clear
Analisis Kadar Vitamin C Mangga Gadung (Mangifera sp) Dan Mangga Golek (Mangifera indica L) Berdasarkan Tingkat Kematangan Dengan Menggunakan Metode Iodimetri Rahman, Nurdin; Ofika, Mairet; Said, Irwan
Jurnal Akademika Kimia Vol 4, No 1 (2015)
Publisher : Universitas Tadulako

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Abstract

Mango fruits contain several nutrients which are beneficial for the improvement of people’s nutrition. Vitamin C is one of which highly needed by the body and can be used as a source of antioxidants. Vitamin C level of mangoes is strongly influenced by their varieties, environments, places, fertilizers, maturity levels, and so on. Levels of vitamin C will increase until the fruit is ripe, and will decrease when the maturity level has been exceeded. This research determined the vitamin C level of gadung and golek mangoes based on the maturity levels. gadung and golek mangoes used as the samples were half-ripe, ripe, and overripe fruits. Analysis of vitamin C levels in the samples was done by iodimetry method. The results showed that the vitamin C levels of Gadung were 83.66 mg/100 g on the half-ripe fruits, 101.82 mg/100 g on the ripe fruits, and 92.85 mg/100 g on the overripe fruits. Whereas the vitamin c levels of golek were 57.72 mg/100 g on the half-ripe fruits, 79.30 mg/100 g on the ripe fruits, and 61,14 mg/100 g on the overripe fruits. The data indicate that the ripe fruits of mangoes contain the optimum level of vitamin C.
Analisis Kalium, Kalsium Dan Natrium Dalam Buah Merah (Pandanus baccari) Asal Kabupaten Poso Sebagai Alternatif Peluruh Batu Ginjal Yulianti, Iluh Devi; Walanda, Daud K.; Said, Irwan
Jurnal Akademika Kimia Vol 4, No 1 (2015)
Publisher : Universitas Tadulako

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Abstract

Red fruit (pandanus baccari) founded in Poso District was not familiar by many people. Red fruit contains chemicals that can be used as a traditional medicine for a wide variety of treatments. The purposes of this study were to analyze the content of potassium, calcium, and sodium in the extract of red fruit, and the solubility of calcium in the extract. Concentration of the extract was varied to 1%, 2%. 4%, and 6% to test the solubility of the calcium. Solubility of calcium in the extract of red fruit was determined by using atomic absorption spectrophotometer (AAS). The results showed that the extract of red fruit contained 30.35 ppm, 58.24 ppm, and 50.00 ppm of potassium, calcium, and sodium, respectively. Results of the solubility test of calcium in the extract showed that higher the concentration affected to the greater solubility. This can be seen from the difference between the lowest concentrations to the highest concentration in a row at 29.446 ppm, to 78.856 ppm, to 189.446, to 285.016 ppm. Thus it can be concluded that the extract of red fruit was possible to dissolve kidney stones.
Perbedaan Hasil Belajar Siswa Kelas X Di SMA Negeri 1 Marawola Melalui Penerapan Model Pembelajaran Kooperatif Tipe Buzz Group Dan Konvensional Pada Materi Sistem Periodik Unsur Utarid, Sri; Sakung, Jamaluddin; Ratman, Ratman
Jurnal Akademika Kimia Vol 4, No 1 (2015)
Publisher : Universitas Tadulako

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Abstract

Many efforts have been done in order to increase the quality of education. One of them is to improve the instructional process. The purpose of this research was to find out the difference of the grade X student’s learning outcomes at SMA Negeri 1 Marawola through the application of cooperative learning of buzz group type and conventional one on the topic of periodic table. The population was the grade X students in the academic year of 2013/2014. The samples were 25 grade XB students as the experimental group (buzz group typpe instruction) and 25 grade XA students as the control group (conventional instruction). The data were collected by using the test on the element periodic system. The testing of the research data was carried out by the t-test statictic analysis of two parts with prerequisite testing: normality and homogenity. It was obtained that the average scores of the experimental group and the control group that is 76.2 and 73.4. Based on the hypothesis analysis with to use statistic t-test it was obtained that tcalculated = 2.89 and ttable = 2.02 on the α = 0.05. this means that H1 was accepted and H0 was rejected, for the the tcalculated was in the H0 rejection. This indicates that there is a difference of the student’s learning outcomes instructed by the cooperative learning of buzz group type and the conventional one at SMA Negeri 1 Marawola.
Buah Mengkudu (Morinda citrifolia L.) Sebagai Pengadsorbi Minyak Jelantah Barau, Fitri; Nuryanti, Siti; Pursitasari, Indarini Dwi
Jurnal Akademika Kimia Vol 4, No 1 (2015)
Publisher : Universitas Tadulako

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Abstract

The used and storage of cooking oil that has not been done properly can lead to exessive water content in the oil. Thus, this can degrade the quality of the oil and fried foods, and turn to interfere health. The aim of this study was to determine teh quality of used cooking oil after adsorbed by mengkudu or noni (morinda citrifolia L.) powder. The quality of the oil was determined based on the free fatty acids content, peroxide numbers, moisture and dirt content before and after adsorbased by using the titration method in determining the FFA content and peroxide number, while the water content and impurities levels were determined by using a closed oven method. The quality standard of good oil is based on the Indonesian National Standard (SNI), i.e. the maximum free fatty acid content of 0.3%, the maximum peroxide numbers of 2 meq.O2/kg, the maximum water contens of 0.3%, and the impurities level of 1.0%. The result indicated that the quality of used cooking oil before adsorption was not in accordance with the quality standards of oil. The quality of oil improved after adsorption with 5 grams, 10 grams and 15 grams of noni powder of 100 ml waste cooking oil, and the best absorbent numbers, moisture content, and dirt with 15 grams were 0.2%, 2 meq.O2/kg, 0.09%. This is showed that the quality of the used cooking oil to be better after the addition of noni powder served as an adsorbent.
Penerapan Pendekatan Contextual Teaching And Learning (CTL) Pada Materi Larutan Penyangga Kelas XI IPA 1 SMA Negeri 1 Poso Pesisir Utara Riyadi, Bayu; Hamzah, Baharuddin; Sakung, Jamaluddin
Jurnal Akademika Kimia Vol 4, No 1 (2015)
Publisher : Universitas Tadulako

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Abstract

The use of learning approach applied to the study of chemistry is still one-way, the student just as a listener and not actively involved in the learning process. This research aims to determine the learning outcomes to the students who take buffer to the grade XI IPA I SMAN 1 Poso Pesisir Utara with contextual teaching and learning approach was better than the grade that follows the learning without contextual teaching and learning approach. The research population was all students of class XI IPA I SMAN 1 Poso Pesisir Utara in academic year 2013-2014 amounted to 65 studets were distributed in to classes. The research sample was determined by purposive sampling, 33 class XI IPA I as the experimental class and 32 class XI IPA 2 as control class. The data collection using test instruments in the form of 18 multiple-choice items that had been tested for validity and reliability. chemistry achievement of buffer test material, research data testing use t-test statistical p-analysis of the parties to the prerequisite test, test for normality and homogeneity tests. The analysis statistical hypothesis t-test was obtained value of tcalculate = 2.41 and ttable value = 1.67 this implies rejection of Ho. It can be concluded that the approach contextual teaching and learning effect on learning outcomes of students of the grade XI IPA I at SMAN 1 Poso Pesisir Utara in the material buffer with a good score than the conventional learning.
Pemanfaatan Biomassa Kulit Batang Jambu Biji (Psidium Guajava L.) untuk Adsorpsi Logam Besi Purba, Lerois; Pursitasari, Indarini Dwi; Said, Irwan
Jurnal Akademika Kimia Vol 4, No 1 (2015)
Publisher : Universitas Tadulako

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Abstract

Guava’s bark contains tannin compound that can be used as an adsorbent. The purpose of thisstudy was to determine the optimum conditions of the adsorption of iron by the bark and its maximumabsorption capacity. The study was conducted by mass variation of bark for iron metal adsorption.The measurement of iron concentration which was not absorbed by the bark was conducted byatomic absorption spectrophotometer. The results showed that the adsorbent mass of 2.5 grams canabsorb 1.93mg/g with percent absorbance of 48.34%, and the maximum absorption capacity of ironlost at 4.98mg/g.
Adsorpsi Biocharcoal Kulit Durian (Durio zibethinus Murr) Terhadap Ion Kadmium Kusuma, I Gede Yoga Nata; Napitupulu, Mery; Walanda, Daud K.
Jurnal Akademika Kimia Vol 4, No 1 (2015)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2015.v4.i1.7843

Abstract

Research on the adsorption biocharcoal of durian (durio zibethinus murr) bark to cadmium ion has been conducted. Heavy metal ions are toxic and generally as a major pollutant to the environment. Handling of waste containing heavy metal ions, especially Cd2+ ions have been carried out and need to be developed. This study described the ability of biocharcoal (biological charcoal) of durian bark to adsorb Cd2+ ions from their solutions. The method in this study was a laboratory experiment using biological charcoal powder of durian bark as an adsorbent of Cd2+ ions. Concentration of Cd2+ ions absorbed was measured using atomic absorption spectrophotometer (AAS) at a wavelength of 228.8 nm. The results showed the optimum Cd2+ ion absorbed was at 80 mg biocharcoal with the percentage of the Cd2+ ion absorbed up to 93.46%, where the weight of the Cd2+ ion absorbed was 16.62 mg/g. The optimum pH was at 7.0 with the percentage of the Cd2+ ion absorbed up to 97.94%, where the weight of the Cd2+ ion absorbed was 17.42 mg/g. The optimum concentration was at 20 ppm with the percentage of the Cd2+ ion absorbed up to 91.97%, where the weight of Cd2+ ion absorbed was 11.42 mg/g. The maximum absorption capacity of biocharcoal to the Cd2+ ion using the Langmuir isotherm adsorption equation was 33.33 mg/g of biocharcoal.
Penerapan Metode Pembelajaran SQ3R Berbantuan Internet Terhadap Hasil Belajar Siswa Kelas X Pada Materi Sistem Periodik Unsur Di SMA Labschool Palu Alep, Boni; Walanda, Daud K.; Hamzah, Baharuddin
Jurnal Akademika Kimia Vol 4, No 1 (2015)
Publisher : Universitas Tadulako

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Abstract

Internet is a global network connecting thousands and even millions of computer networks with a personal computer so that the user can obtain a variety of information from wider sources. This internet service is used to assist the implementation of the SQ3R learning method that is expected to enrich the literature. The SQ3R learning method is a method of learning which uses the reading technique intensively and rationally to understand the main ideas, the details of a reading, and a comprehensive understanding of a passage with the steps i.e. surveying, asking, reading, communicating, and reviewing. The aim of this study was to determine the effect of the implementation of SQ3R learning method internet-assisted to the learning outcomes (cognitive) of students in the class X on the material periodic table of elements at Senior High School Labschool Palu. This research was a quasi-experimental with non-randomized pre-test and post-test control groups design. This research was carried out by holding two groups of class X science 1 as the control group (n = 19) and Class X science 2 as the experimental group (n = 18).Testing of research data used t-test statistical analysis one side (right side) with the prerequisite tests: normality and homogeneity tests. The results of the data analysis obtained the average value (X1 ) of experiment class was 83.94 with a standard deviation of 8.24 and (X1 ) of control class was 77.78 with a standard deviation of 8.54. Results of the hypothesis testing using statistical t-test one side (right side) obtained tcount>ttable value was 1.867 > 1.690 with a confidence level (α) = 0.05 and a degree of freedom (df ) = 35. Based on the results of hypothesis testing, then Ho is rejected and H1 is accepted so it can be concluded that the SQ3R learning method internet-assisted on the material Periodic System of Elements has a positive influence on the learning outcomes of students in the class X at Senior High School Labschool Palu.

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