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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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Adsorpsi Ion Tembaga (Cu) Dan Ion Besi (Fe) Dengan Menggunakan Arang Hayati (Biocharcoal) Kulit Pisang Raja (Musa sapientum) Nirmala Nirmala; Vanny M. A. Tiwow; Suherman Suherman
Jurnal Akademika Kimia Vol 4, No 4 (2015)
Publisher : Universitas Tadulako

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Abstract

This study determine the contact time, pH, and the optimum concentration of the solution of copper (Cu) and iron (Fe) from skin the plantain (musa sapientum). Advances in the industry today resulted in many human activities that caused increasing impact of the pollution on surrounding of the environment. Environmental pollution by heavy metals being a serious problem along with increasing the use of heavy metals in the industry. The method used in this study was a laboratory experiment using colorimeter. The results showed that the adsorption of copper and iron on the plantain bark influence a time variation of Cu and Fe occurred in the 60 minute and 30 minute (99.64% and 99.54%); variation of pH for Cu and Fe occurrs in pH 4 and pH 3 (99.62% and 99.58%) and variation of concentration for Cu and Fe occurred at 20 ppm and 1 ppm (80.74% and 96.81%), respectively.
Pengaruh Ion Logam Cu(II) Terhadap Persen Ekstraksi Ion Pb(II) Menggunakan Teknik Emulsi Membran Cair Irawati, Dwi Ardi; Hamzah, Baharuddin; Rahman, Nurdin
Jurnal Akademika Kimia Vol 5, No 4 (2016)
Publisher : Universitas Tadulako

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Abstract

This study aimed to determine effect of Cu(II) ion toward percent extraction of Pb(II) ion using emulsion liquid membrane technique. Variation concentrations of Cu(II) added were 0, 50, 100, 150, 200 and 250 ppm with the initial concentration of Pb(II) was 245 ppm. This extraction used benzoyl acetone as a chelating agent. The extraction results were measured by Spectrodirect. The results showed that percent extraction of Pb(II) ion prior addition of Cu(II) ion was 99.09%, but after addition of Cu(II) to a concentration up to 250 ppm, the percent extraction of Pb(II) ions turned to decrease by 97.92%.
Uji Aktivitas Antioksidan Ekstrak Daun Salam (Syzygium Polyanthum) Dengan Menggunanakan 1,1-Difenil-2-Pikrilhidrazil Rahman, Nurdin; Bahriul, Putrawan; Diah, Anang Wahid M.
Jurnal Akademika Kimia Vol 3, No 3 (2014)
Publisher : Universitas Tadulako

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Abstract

Antioxidant activity test of bay leave (Syzygium polyanthum) extract using 1,1-diphenyl-2-picrylhidrazyl (DPPH) has been investigated. The aim of this research is to determine antioxidant strength of bay leave (Syzygium polyanthum) extract. The bay leaves used in this research were young, medium, and old leaves categories. Concentration of DPPH free radical after additional bay leave extracts were determined by UV-Vis spectrophotometry. Variation concentrations of bay leave extracts were 20 ppm, 40 ppm, 60 ppm, and 80 ppm. Vitamin C solution was used as the positive control at the similar concentration, while DPPH solution in ethanol absolute was the negative control. The results showed that IC50 values for young, middle, and old leaves extracts were 37.441 ppm, 14.889 ppm, and 11.001 ppm, whereas vitamin C was 9.898 ppm. Based on these IC50 values, vitamin C is the strongest antioxidant than young, middle, and old bay leave extracts, and these extracts are classified as very strong natural antioxidant.
Serbuk Dari Limbah Cangkang Telur Ayam Ras Sebagai Adsorben Terhadap Logam Timbal (Pb) Satriani, Dewi; Ningsih, Purnama; Ratman, Ratman
Jurnal Akademika Kimia Vol 5, No 3 (2016)
Publisher : Universitas Tadulako

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Abstract

The aim of this study is to determine the optimum time and weight required for eggshell powder when it absorbs Pb, and to determine the adsorption capacity of the eggshell powder at the optimum condition for Pb with the shaking time variation of 10, 20, 30, 40 and 50 minutes. The weight variation of adsorbent is 0.25, 0.50, 0.75, 1 and 1.25 grams. The work steps in this study were production of the eggshell powder as the adsorbent, making of a solution of Pb 60 ppm, and determination the Pb concentration at equilibrium using a spectrophotometer spektrodirect respectively. The results obtained after the adsorption process for the time variation was 30 minutes, this optimum time giving %Pb absorbed was 94.65%. The weight variation of adsorbent is 1 gram, this optimum weight giving %Pb absorbed was 98.91%. Furthermore, the absorption capacity adsorbent of eggshell powder in both optimum conditions was 0.078 mg Pb/mg adsorbent.
Uji Aktivitas Antioksidan Ekstrak Etanol Biji Buah Merah (Pandanus Conoideus De Vriese) Asal Kabupaten Poso Sulawesi Tengah Sulaeha, Siti; Jura, Minarni R.; Rahman, Nurdin
Jurnal Akademika Kimia Vol 6, No 3 (2017)
Publisher : Universitas Tadulako

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Abstract

Red fruit seeds have not been studied and known benefits, therefore it needed scientific information about the content and benefits of red fruit seeds. This study aims to analyze the antioxidant power red fruit seed extract as well determining the IC50 value of red fruit seed extract which has the ability of natural antioxidants. Determination of free radical DPPH (1,1-diphenyl-2-picrylhidrazyl) after the addition of red fruit seeds extract is determined using UV-Vis spectrophotometer. Variations in the concentration of the red fruit seed extract used is 20 ppm, 40 ppm, 60 ppm, 80 ppm and 100 ppm.The positive control used is vitamin C with the same concentration. While the negative control using DPPH solution dissolved in absolute ethanol. The results showed IC50 values obtained for the red fruit seed extract and vitamin C are 223.8 ppm and 1.73 ppm. Based on the IC50 data can be known that vitamin C antioxidants more powerful than red fruit seed extract which belongs to natural antioxidants are very weak.
Sintesis Bioetanol Dari Jerami Padi (Oryza sativa L) Melalui Fermentasi Said, Muhammad; Diah, Anang Wahid M.; Sabang, Sri Mulyani
Jurnal Akademika Kimia Vol 3, No 4 (2014)
Publisher : Universitas Tadulako

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Abstract

Rice straw is an agricultural waste into organic waste further. Rice straw can be utilized as an alternative energy that is bioethanol. The objective of this research was to determine the optimal concentration of ethanol by the duration of fermentation. This research applied fermentation to rice straw using yeast bread in various times of 7, 10, 13, 16, 19, and 22 days. The steps of this research were sample preparation, delignification, hydrolysis, and fermentation. Bioethanol from fermented rice straw was analysed using alcoholmeter. The products of fermented ethanol increased and reached the optimum at day 13, which was 4.83+0.05%, then decrease the ethanol content at day 16, 19, and 22.
PENENTUAN KADAR KALIUM (K) DAN KALSIUM (Ca) DALAM LABU SIAM (Sechium Edule) SERTA PENGARUH TEMPAT TUMBUHNYA (Determination of Potassium (K) and Calcium (Ca) Content in Chayote (Sechium Edule) and The Effects With its Growth Soil) Cicik Fitriani, Ni Luh; Walanda, Daud K; Rahman, Nurdin
Jurnal Akademika Kimia Vol 1, No 4 (2012)
Publisher : Universitas Tadulako

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Abstract

Chayote (sechiumeaite) is an alternative source of vegetable which is consumed largely by the community. For that reason, the research was conducted to determine the content of potassium (K) and calcium (Ca) as wll as its relation to the growth soil. The method of this research is laboratory experiments by using atomic absorption spectrometry. The result shows that the content of potassium in Palolo’s chayote meat is 134.35 mg/100 g, skin and fruit meat is 269.10 mg/100 g, and in the ground is 34.02 mg/100 g. However, in Kebun Kopi’s pumpkin, the content of potassium (K) is 177.42 mg/100 g in its fruit meat, 298.35 mg/100 g in its skin and fruit meat, and 88.02 mg/100 g in the soil. On the other hands the content of calcium obtained as follows: in Palolo’s chayote meat is 38.53 mg/100 g, in the skin and fruit meat is 55.865 mg/100 g, and in the soil is 32.72 mg/100 g. In the area of Kebun Kopi’s chayote meat is 20.535mg/100 g, in the skin and fruit meat is 30.605 mg/100 g, and in the soil is 7.682 mg/100 g. Therefore, the content of potassium and calcium obtained is higher than in the literature.
Pembuatan Tepung dari Biji Kakao (Theobroma cacao L) dan Uji Kualitasnya Asmaul Husna; Suherman Suherman; Siti Nuryanti
Jurnal Akademika Kimia Vol 6, No 2 (2017)
Publisher : Universitas Tadulako

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Abstract

Cacao plant is one of the plantation crops which contribute to improving economic for the Province of Central Sulawesi. This study aimed to prepare and test the flour quality of cocoa beans flour after soaking in salt water, NaCl, and lime water, Ca(OH)2, at various concentrations. Samples were cocoa beans taken from Rantekala Sigi Province of Central Sulawesi, furthermore, the cocoa beans were made into flour. Results showed that the moisture, ash, fat, and carbohydrate of cocoa beans flour were almost met the ISO standard, with the exception of the protein level, i.e 5.0% for max. moisture level, 1.6% for max. ash level, 10.0% for min. fat level, and 70% of min. carbohydrates level. But, the best quality was from soaking with lime water at a concentration of 20% with a value of 2.8% moisture level, at a concentration of 15% with a value of 24.6% level, and at a concentration of 10% with a value of 78.26% carbohydrate level. However, for the ash level, the best quality was by soaking in salt water at a concentration of 5% with a value of 4.1%. Based on these results, it can be concluded that the cocoa beans flour is better soaked in lime water than salt water.
Pengaruh Konsentrasi Ekstrak Tanaman Meniran (Phillanthus niruri L.) Dalam Melarutkan Kalsium Winarti, Winarti; Nuryanti, Siti; Said, Irwan
Jurnal Akademika Kimia Vol 3, No 4 (2014)
Publisher : Universitas Tadulako

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Abstract

Research on the solubility of calcium has been conducted using meniran (phillanthus niruri L.) plant extracts by varying concentrations. This research was conducted by laboratory experiments using meniran plant extracts as samples in dissolving calcium phosphate as a substitute for kidney stones. Meniran is a type of acidic herbal plant extract which contains flavonoids and potassium, so it can dissolve calcium. This study was conducted to determine the most effective concentration of meniran plant extracts from the variation concentration (2%, 4%, 6%, 8% and 10%) in dissolving calcium, and also to determine the effectiveness of this extract compared to Batugin Elixir and distilled water. Determination of the concentration of dissolved calcium in meniran plant extracts was done by a flame photometer. The results showed concentration of 10% of meniran plant extract was effective in dissolving calcium whichwas equal to 46.1 ppm. However, Batugin Elixir was more effective in dissolving calcium with a concentration equal to 58.2 ppm, while distilled water can dissolve the calcium only equal to 4.8 ppm.
ANALISIS ASPEK KESULITAN MENYELESAIKAN SOAL-SOAL STOIKIOMETRI BAGI SISWA KELAS X SMA NEGERI 6 PALU Eka Anisyah Miftahul Jannah; Supriadi Supriadi; Suherman Suherman
Jurnal Akademika Kimia Vol 2, No 1 (2013)
Publisher : Universitas Tadulako

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Abstract

The difficult aspect of solving stoichiometry problems for class X student need more attention. The aim of this research is to provide an overview of students’ ability in solving stoichiometry problems from cognitive aspects, and to determine the subject and the degree of students difficulty in solving Stoichiometry problems. The research subjects are students of class X Senior High School 6 Palu of the school year 2012/2013.The research sample consisted of two classes, namely Xa classes with 17 students and classes Xd with 17 students. An essay test with 13 items of question which has been validated by the school teacher are the instrument. The results of this descriptive study shown that difficulties students in the C1 cognitive aspect (Knowledge) about 11.86% with very low category, C2 (Comprehension) of 42.08% with moderate category and C3 (Application Concept) about 62.29% with a high category, and the student’s difficulties in determining the amount of moles about 46.68% with moderate category, in determining the molar mass about 36.85% with low category, the molar volume about 44.61% with a medium category, in understanding and applying Avogadro’s hypothesis and the number of moles of gas about 44.61% with moderate categories, in determining empirical formula and molecular formula about 58.96% with moderate category, hydrate compounds about 64.63% with high category, percentage of elements in compound about 56.15% with medium category, limiting reagent about 67.86% with the high category, the number of reactants or reaction products 80.10% with the high category. The conclusion is that the most difficult aspects of cognition are at C3 (Application Concepts), and the most difficult subject is to determine limiting reagents and hydrate compounds.

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