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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 10 Documents
 1 
Search results for , issue "Vol 8, No 1 (2019)" : 10 Documents clear
The Influence of Contextual Teaching and Learning (CTL) Model on Learning Outcomes in Colloid System Material at Class XI Madrasah Aliyah Negeri 2 Model Nurhayati, Fitri; Mustapa, Kasmudin; Jura, Minarni Rama
Jurnal Akademika Kimia Vol 8, No 1 (2019)
Publisher : Universitas Tadulako

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Abstract

This study aimed to determine students’ learning outcomes in Grade X at MA Yayasan Islam Indonesia Pulau Sebatik by applying cooperative learning model-Jigsaw type on the hydrocarbons material. This type of study was a quasi-experimental research with non-randomized pretest-posttest control group design. The population in this study was students of class X MA YIIPS academic year 2014/2015 which amounted of 42 students and consisted of 2 classes. The sample in this study was class XA MA YIIPS (n = 22) as the experiment class and class XB MA YIPS (n = 22) as the control class. The result of data analysis in the experiment class obtained X̅1 value of 78.81 with a standard deviation of 10.41, and in the control class obtained X̅2 value was 70.72 with a standard deviation of 11.55. The result of hypothesis test was tcount > ttable (8.17 > 1.67) with significant level (α) of 0.05 and degree of freedom of 42. This result indicated that H0 was rejected and H1 was accepted, so it can be concluded that the students’ learning outcomes of chemistry on the hydrocarbons material treated with cooperative learning model-Jigsaw type is better than untreated class.
Fabrication of Charcoal from Jackfruit’s Peel (Artocarpus heterophyllus) as Adsorbent on Dissolved Cadmium and Nickel Baloga, Hendra; Walanda, Daud K; Hamzah, Baharuddin
Jurnal Akademika Kimia Vol 8, No 1 (2019)
Publisher : Universitas Tadulako

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Abstract

Jackfruit’s peel contains lignocellulosic compounds that potential for fabrication of charcoal and useful for adsorbing heavy metals. Based on this, then it was conducted a study on the utilization of charcoal from jackfruit’s peel to be used as adsorbent on cadmium and nickel. The analysis process of this research was conducted by using atomic absorption spectrophotometry (SSA). The results showed that charcoal’s characteristics from jackfruit’s peel contained of 4.4% water, 9.3% ash, and biomass content that can be used as an absorbent was 86.3%. The optimum adsorption of charcoal from jackfruit’s peel for cadmium ion was contact time of 120 minutes, pH 7 and concentration of 40 mg/L with the percentages of penetration respectively were 84.65%, 99.10%, and 99.43%. On the other hand, for nickel was 150 minutes of contact time, pH 5, and concentration of 20 mg/L with percentage of penetration were 87.95%, 91.75%, and 75.15% respectively.
Analysis of Potassium, Magnesium and Sodium Contents in Chayote (Sechium edule Sw.) from Sedoa, North Lore District, Poso Lage, Mersed Djein; Ningsih, Purnama; Sakung, Jamaluddin
Jurnal Akademika Kimia Vol 8, No 1 (2019)
Publisher : Universitas Tadulako

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Abstract

Chayote has minerals such as potassium, magnesium and sodium which are very beneficial for the human body. This study aimed to determine potassium (K), magnesium (Mg) and sodium (Na) in ripe and young chayote extracts as well as old and young chayote seeds extracts by using quantitative analysis method with atomic absorption spectrophotometry. Potassium, magnesium and sodium were analysed at a wavelength of 766.5 nm, 285.2 nm and 589 nm. The results showed that the potassium contents are 80.059 mg/100g in ripe chayote;  45.431 mg/100g in young chayote; 65.287 mg/100g in old chayote seed; and 73.014 mg/100g in young chayote seed. Sodium contents are 61.032 mg/100g in ripe chayote; 49.936 mg/100g in young chayote; 61.101 mg/100g in old chayote seed; and 71.621 mg/100g in young chayote seed. Additionally, magnesium contents are 47.327 mg/100g  in ripe chayote;  74.324 mg/100g in young chayote; 57.658 mg/100g in old chayote seed; and 58.529 mg/100g in young chayote seed.
Utilization of Chitosan as an Animal Feed Supplement and Its Effect on Fattening of Organic Rooste (Gallus domestica sp) Firdamayanti Firdamayanti; Suherman Suherman; Minarni Rama Jura
Jurnal Akademika Kimia Vol 8, No 1 (2019)
Publisher : Universitas Tadulako

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Abstract

Chitosan has functional groups of an amine group (-NH2) that acts as a coagulant dyestuff, a protein binder, and an amino acid; and a hydroxyl group (-OH). The present of these functional groups cause high chemical reactivity of chitosan. Chitosan can be used as a dietary supplement of rooster. This study aimed to determine the effect of chitosan as a dietary supplement on fattening rooster. Fattening rooster can be seen from an increase of weight per week. This study provided bran as much as 200 gr/animal/day, then the bran was added with chitosan solutions as each concentration. The results obtained for the chicken A which given bran with chitosan solution increased in body weight of 0.1 kg at the first week, while for the chicken given bran without chitosan increased in body weight of 0.1 kg at the third week. For the chicken B which given bran with chitosan increased in body weight of 0.1 kg at the first week, while for the chicken given bran without chitosan increased in body weight of 0.1 kg at the second week. Based on the data for ± 1 months of study obtained that good chitosan concentrations used in this study for the chicken A were at concentrations of 6% and 8% by increasing each of 0.5 kg, while for the chicken B was at a concentration of 6% by increasing of 0.6 kg.
Effect of Concentration of Mango Seed Extract (Mangifera Indica L.) as an Organic Inhibitor on Iron Nail Corrosion in NaCl Solution Medium Almahdali, Khafifah; Walanda, Daud K; Napitupulu, Mery
Jurnal Akademika Kimia Vol 8, No 1 (2019)
Publisher : Universitas Tadulako

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Abstract

This study aims to determine the effect of mango seed extract concentration on the rate of corrosion of iron nails in corrosive medium of NaCl solution and seawater as comparison.The research begins with maceration of mango seeds followed by evaporation to produce the extract as an inhibitor with a variation of concentration 1 - 5%. The method of determining the corrosion rate was the weight loss method with soaking for 7 days. The results showed that the highest corrosion inhibition efficiency occurred at 3% concentration for immersion with corrosive medium of 3% NaCl and 2% concentration for soaking in sea water with efficiency respectively 15.34% and 10.63%. Based on the results of the study, it was found that the increasing concentration of mango seed extract resulted in the efficiency effect on corrosion of nails.
The Influence of Cooperative Learning Model-Jigsaw Type on Students' Learning Outcomes in Grade X on the Hydrocarbons Material at MA Yayasan Islam Indonesia Sebatik Island Akbar, Akbar; Mustapa, Kasmudin; Said, Irwan
Jurnal Akademika Kimia Vol 8, No 1 (2019)
Publisher : Universitas Tadulako

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Abstract

This study aimed to determine students’ learning outcomes in Grade X at MA Yayasan Islam Indonesia Pulau Sebatik by applying cooperative learning model-Jigsaw type on the hydrocarbons material. This type of study was a quasi-experimental research with a non-randomized pretest-posttest control group design. The population in this study was students of class X MA YIIPS academic year 2014/2015 which amounted to 42 students and consisted of 2 classes. The sample in this study was class XA MA YIIPS (n = 22) as the experiment class and class XB MA YIPS (n = 22) as the control class. The result of data analysis in the experiment class obtained X̅1 value of 78.81 with a standard deviation of 10.41, and in the control, class obtained X̅2 value was 70.72 with a standard deviation of 11.55. The result of the hypothesis test was tcount > ttable (8.17 > 1.67) with a significant level (α) of 0.05 and degree of freedom of 42. This result indicated that H0 was rejected and H1 was accepted, so it can be concluded that the students’ learning outcomes of chemistry on the hydrocarbons material treated with cooperative learning model-Jigsaw type are better than untreated class.
Determination of Potassium (K) in Green Coconut (Cocos viridis) from Dolo and Labuan areas using Spectrophotometry Hikmawandari, Hikmawandari; Ningsih, Purnama; Ratman, Ratman
Jurnal Akademika Kimia Vol 8, No 1 (2019)
Publisher : Universitas Tadulako

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Abstract

One of the potential plantations in Dolo and Labuan area is coconut plant. Coconut water as one of the coconut product has not been widely used, even it contains many minerals. Potassium contained in coconut water can be utilized an additional mineral intake for human. This study aimed to determine potassium (K) levels in green coconut (coconut viridis) water from Dolo and Labuan areas using spectrophotometric. The results showed that the average concentration of K in green coconut water samples from Dolo area was 162 ppm, while from Labuan area was 154 ppm. This study concluded that the higher level of potassium is in green coconut water samples from Dolo area.
The Influence of Problem Based Learning Model (PBL) Using Lesson Study (LS) Pattern on Quality of Chemistry Learning in SMAN 1 Banawa Nur Hikmah; Paulus Hengky Abram; Suherman Suherman
Jurnal Akademika Kimia Vol 8, No 1 (2019)
Publisher : Universitas Tadulako

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Abstract

This study aimed to determine the effect of problem based learning model (PBL) using Lesson Study (LS) pattern on the quality of chemistry learning at SMAN 1 Banawa. This research type was a quasi-experiment with design equivalent pretest-posttest design. The sample used in this research was the students of class XI MIPA 3 as the experiment with the amount of 32 students and students of class XI MIPA 4 as the control class with the amount of 33 students. The result of data analysis obtained, the mean value of experiment class ( ) was 74.03 and the control class ( ) was 69.84. The average of students’ activity in the experimental and control class respectively was 56.66%, and 56.66% that was categorized as active enough. The result of hypothesis testing with two-party of t-test statistic obtained was –ttable< tcount> +ttable(tcount = 5.37 dan ttable = 1.67) with a significance level α = 0.05 and degrees of freedom 63, H0 was rejected and Ha was accepted based on the results of data analysis. So it can be concluded that there is influence of PBL model using LS pattern on the quality of chemistry learning in SMAN 1 Banawa.
Purification of Used Cooking Oil Using (Tamarindus indica L.) Seeds Fauzhia, Hariati; Jura, Minarni Rama; Ningsih, Purnama
Jurnal Akademika Kimia Vol 8, No 1 (2019)
Publisher : Universitas Tadulako

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Abstract

Adsorbent has been widely used in the purification of used cooking oil to improve their quality. This study aimed to determine the quality of cooking oil after adsorbing with tamarindus indica L. seeds. Parameters of the oil quality were color, free fatty acid, peroxide number, and moisture levels. The oil color was determined using UV-Vis spectrophotometer, free fatty acid level using acid-base titration method, peroxide number level using iodometric titration method, and moisture level using gravimetric method. Concentration of adsorbent on the adsorption process varied by 1%, 3% and 5% with two types of cooking oil sample namely traditional cooking oil and brand X cooking oil. The results showed that the oil color became brighter by adding adsorbent. Free fatty acid, peroxide number, and moisture levels decreased by increasing the adsorbent concentration. The best result was obtained at 5% adsorbent concentration. Traditional cooking oil decreased in absorbance from 0.2955 to 0.0610, free fatty acid level decreased from 2.7300% to 0.8300%, peroxide number level decreased from 7 meq/kg to 2.4 meq/kg, and moisture level decreased from 1.5191% to 0.1495%. While for the cooking oil of brand X decreased in absorbance from 0.4355 to 0.1860, free fatty acid level decreased from 1.1900% to 0.6600%, peroxide number level decreased from 4 meq/kg to 1.3 meq/kg, and moisture level decreased from 1.4198% to 0.1197%.
The analysis of Calsium (Ca), Magnesium (Mg), Sodium (Na) and Posphorus (P) ijn Beluntas (Pluchea indica L.) Leaves Fitriani, Eva; Walanda, Daud K.; Hamzah, Baharuddin
Jurnal Akademika Kimia Vol 8, No 1 (2019)
Publisher : Universitas Tadulako

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Abstract

Beluntas are bushes that may consumed as vegetable which mostly founded in Central of Sulawesi. The research purposes to determine the concentration of calcium (Ca), magnesium (Mg), sodium (Na), and posphorus (P) in beluntas leaves (pluchea indica L.). The concentration of Ca, Mg, and Na were obtained using atomic absorption spectrophotometer and the concentration of P was obtained using spectrodirect spectrophotometer. The average concentration of mineral in beluntas leaves are Ca 678.71 mg/100g, Mg 93.38 mg/100g, Na 198.11 mg/100g, and P 29.84 mg/100g.

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