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JKPK (Jurnal Kimia dan Pendidikan Kimia)

jkpk
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Published by Universitas Sebelas Maret

ISSN : 25034146 EISSN : 25034154 DOI : -

Core Subject : Science, Engineering,

Chemical Engineering, Chemistry & Bioengineering Chemistry

The JKPK (Jurnal Kimia dan Pendidikan Kimia) is a national journal, published three times a year in April, August, and December, containing research articles on Chemistry and Chemistry education.

Arjuna Subject : -

Articles 218 Documents

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The Effect of Catalyst in the Process of Nano-Silica Particle Formation as a Hydrophobic Material Ikhwanul Muslim; Wulan Safrihatini; Witri Aini
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 2, No 3 (2017): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Nano Silica is known as a hydrophobic material used to coat the material that further modifies the surface properties of the material. In this study the process of making nano silica material is using sol-gel method. The sol gel process is defined as the process of forming an inorganic compound through chemical reaction in solution at a low temperature wherein the process a phase changes from the colloidal suspension (sol) to a continuous liquid phase (gel). The types of catalyst were studied. The result was then applied to cotton, polyamide and silk fabrics. Acid catalyst showed the greatest moisture reduction based on Moisture Content and Moisture Regain evaluation in cotton and polyamide fabrics, whereas base catalysts showed a significantly less moisture reduction on the three fabrics. The use of these types of catalyst will also affect the value of the tensile strength of each fiber. Tensile test results showed that the use of acid catalysts decreased the maximum tensile strength in cotton fabrics by 88.57%, compared to polyamide and silk fabrics and the use of base catalyst showed less significant decreased on tensile strength for all fabrics.

Optimization Experimental Procedure and Setup of a Guided Inquiry Laboratory Worksheet of Transesterification Reaction on Biodiesel Production Dwiyanti, Gebi; Suryatna, Asep; Nurhayati, Mita
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 3, No 1 (2018): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

The aims of this research are producing an optimal experiment procedure and determining the feasibility of a guided inquiry laboratory worksheet of transesterification reaction on biodiesel production context. This research used research and development methods that composed of two stages, initial product preparation and model development (until limited testing). The data sources of this research are 20 students grade XII of science, seven chemistry teachers and three lecturers from chemistry education program of FPMIPA UPI. The instruments that used in this research are optimization and observation sheets of inquiry stages implementation, rubric of assessment students’ answer, sheets of assessment by teacher and lecturer, and student’s response questionnaires. The optimization of biodiesel production is: 12 mL of palm oil is added into erlenmeyer flask that contained boiling stone, then added by 0.12 g Potasium hidroxide in 4.5 mL methanol solution. The erlenmeyer flask then closed by rubber stopper with test tube in the middle of rubber stopper that filled with water and heated at 45oC in water bath for 5 mins by shaking the flask. The feasibility of laboratory experiment is categorized as very good. Teacher and lecturer assessment on the concept conformity, language, and the appearance of worksheet is categorized as very good. Student’s responses of laboratory activity and the worksheet are good.

The Effect of pH and Concentration of KNO3 Solution to the Performance of Nd3+ Ion Selective Electrode Using HPMBP Ionophore Sosidi, Husain; Buchari, Buchari; Noviandri, Indra
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 3, No 3 (2018): JKPK( Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

The phenyl-3-methyl-4-benzoyl-5-pyrazolone (HPMBP) synthesized and characterized as ionophore in potentiometric analysis of ion selective electrode method (ISE) with polytetrafluoroethylene (PTFE) as the supporting phase. The pH and concentration of the ionic strength adjuster (ISA) were varied to know at the optimum pH and concentration of the ion-selective electrode (ESI) KNO3, thus potential Nd3+ gives the best performance. Before use the PTFE membrane was immersed in a chloroform-HPMBP solution of 1.5-2.0% w/v for 24 h. The pH variation of the buffer solution was adjusted to the pH range of 2-10 using HCl and NaOH solutions, whereas the concentration of KNO3 varies from 10-1 to 10-3 M. The concentration range of Nd3+ is between 10-2 and 10-7 M. The electrode potential measurement results (ENd) obtained the best performance value at pH 4 with KNO3 concentration of 10-2 M, sensitivity (S) 18.39 ± 1.2 mV/decade and response time less than 23 s.

Determination of Immobilization Optimum Conditions of Trichoderma viride’s Xilanase on Acid-Activated Zeolite Matrix Sutrisno, Sutrisno; Roosdiana, Anna; Prasetyawan, Sasangka; Sari, Intan Permata
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 2, No 2 (2017): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Xylanase is an enzyme that catalyzes the reaction of xylan hydrolysis into xylose. The free enzyme can be used only once, therefore it needs to be made in the form of immobilization. This study aims to determine the optimum conditions for immobilization of xylanase using an acid-activated zeolite. The xylanase immobilization was performed on variations of shaking time (1-5) hours, variation of xylanase concentration (2 - 4 mg / mL) using 0.1 g zeolite at room temperature and a shaking rate of 100 rpm. The amount of xylanase adsorbed on the zeolite was determined by spectrophotometry using the Biuret reagent and the immobilized xylanase activity formed was determined spectrophotometrically using a DNS reagent The results showed that the optimum condition of xylanase immobilization at zeolite was achieved at 3 hrs shaking time and xylanase concentration 3.5 mg / mL with xylanase adsorbed of 156.5 mg/g zeolite and activity 26.67 units.

Synthesis and Determination Level of Calcium-Phosphate Hydroxyapatite (HAp) from Chicken Eggshell Imelda Wadu; Hartati Soetjipto; Margareta Novian Cahyanti
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 3, No 1 (2018): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

The purpose of this study was to synthesize bio-ceramics hydroxyapatite (HAp) from local chicken eggshell and broiler chicken eggshell. The synthesis was done by using precipitation method with sintering temperature 1000ºC. In addition, to determine the levels of calcium-phosphate contained in HAp bioceramics AAS and Spectrophotometer UV-Vis were used. The results show that of 10 grams of each eggshell powder can produce 8.8-9.8 g of HAp powder. Determination of calcium level in HAp by AAS was about ± 71.23% from local chicken eggshell and ± 78.62% from broiler chicken eggshell. Whereas determination of phosphate level in HAp using Spectrophotometer UV-Vis was about ± 67.22% from local chicken and ± 73.75% from broiler chicken eggshell.

Estimation of Air Pollutant Emissions in Eastern Indonesia from Non-Oil and Gas Sources (Case Study in Sulawesi and Papua) Dessy Gusnita; Dita Fatria
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 3, No 3 (2018): JKPK( Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Estimation of air pollutant emissions from non-oil and gas sources in eastern Indonesia, namely Sulawesi and Papua provinces during the period 2014 – 2016 was conducted. This paper intended to estimate the emission of three air pollutants namely NOx, SO2 and CO2. The aim was to find out the amount of pollutant and greenhouse gas (GHG) emissions in the Sulawesi and Papua regions. The method used was the emission estimation method based on statistical data of Gross Regional Domestic Income (GRDP) in the Papua and Sulawesi regions. The results from estimation of pollutant emissions was then carried out for pollutant emissions mapping. The pollutant emission estimation showed the emission of air pollutants in Sulawesi region was higher than Papua. The mapping of emissions in Sulawesi were consisted of four provinces, namely north, central, south and southeast Sulawesi. The Papua region were consisted of Papua and west Papua provinces. The highest emission in Sulawesi region was south Sulawesi. The CO2 emission in Sulawesi was increase about 23% with the detail value; 84.4 tons in 2014; 94.3 tons in 2015; and 103.7 tons in 2016. The emission of NOx during 2014 until 2016 are 0.53, 0.58 and 0.64 tons, there was an increasing in the emission of NOx around 21%. In addition, SO2 emission of south Sulawesi are 0.42 tons in 2014, 0.47 tons in 2015 and 0.51 tons in 2016, increased about 21 % during the year 2014 - 2016. In the Papua region, the emission in Papua was higher than Papua Barat province. CO2 emissions in Papua during 2014 -2016 were 112, 124.8 and 144.99 tons, it means the CO2 was increased 29%. The emission of NOx during 2014-2016 were 0.70, 0.77 and 0.89 tons, increased around 27%. In addition, SO2 emission was increase 26% with the detail value; 0.56 tons in 2014; 0.61 tons in 2015 and 0.71 tons in 2016.

Interactive Multimedia Development Based on Adobe Flash CS6 Profesional on Learning of Chemical Equilibrium Yeni R. Saselah; Muhammad Amir M; Riskan Qadar
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 2, No 2 (2017): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

The aims of this study were to produce an interactive multimedia based on Adobe Flash Cs6 Professional in one vocational school (SMK) and to know the students' response to the use of the media used. The subject of this study was 34 students in Samarinda. This study is a research development. The data were gained from a questionnaire by expert validity and response by students. The result was an interactive multimedia that could be operated in computer and Android-based handphone. Students' response to interactive multimedia in the topic chemical equilibrium used was 97,8 % positive. The conclusions were multimedia resulted are eligible to be applied in learning of chemical equilibrium in vocational school dan had a positive response from the students.

Analysis of a Quantitative Relationship Between the Structure and Analgesic Activity of Meperidin Derivatives Using Semi-Empirical AM1 Method Suryadi Budi Utomo; Fajar Sanubari; Budi Utami; Nanik Dwi Nurhayati
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 2, No 3 (2017): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

This research aims were to analize a quantitative relationship between the structure and analgesic activity of meperidine derivatives and to determine the Hansch equation between meperidine derivatives and their analgesic activity. The study was done by computer calculation (in sillico) using semiempirical method of AM1. The first stage was molecules modelling of meperidine derivative compounds, followed with performing the process of geometric optimization. The second step was to determine the descriptor value in the form of electronic, steric, and hydrophobic descriptors. The last stage was done by statistics analysis using multiple regressions with backward model. The results showed that analgesic activity was significantly influenced by variation of descriptors, especially electronic descriptor which has more dominant influence than steric and hydrophobic descriptors. The most influential descriptor is the charge on N atoms, since N atoms are an important component in analgesic compounds.

The Effect of Chemistry Learning with PjBL and PBL Model Based on Tetrahedral Chemistry Representation in term of Student’s Creativity Frenika Widyasari; Nurma Yunita Indriyanti; Sri Mulyani
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 3, No 2 (2018): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

This research aims to know: (1) the effect of PjBL and PBL models based on tetrahedral chemistry representation toward student’s achievement; (2) the effect of creativity toward student’s achievement; and (3) the interaction between PjBL and PBL models based on tetrahedral chemistry representation with creativity toward student’s achievement on the colloid subject in SMA Negeri 1 Sragen. This research used quasi experiment method with 2×2 factorial design. Samples of research were determined with cluster random sampling technique and used 2 classes in SMA Negeri 1 Sragen. Data has been collected by test, questionnaire, observation, and literature documents which owned by teacher. Hypothesis testing of this research for cognitive and skill aspects of learning achievement used parametric test of Anova two ways, and for attitude aspect of learning achievement used non-parametric test of Kruskal-Wallis. The results of this research showed that: (1) there was no effect of chemistry learning using of PjBL and PBL models based on tetrahedral chemistry representation toward knowledge, attitude, and skill aspects of student’s achievement; (2) there was effect of high and low creativity toward knowledge and skill aspects of student’s achievement but there was no effect toward attitude aspect of student’s achievement; and (3) there was no interaction between using PjBL and PBL models based on tetrahedral chemistry representation with creativity toward knowledge, attitude, and skill aspects of student’s achievement.

The Comparison Accuracy Estimation of Test Reliability Coefficients for National Chemistry Examination in Jambi Province on Academic Year 2014/2015 Rida Sarwiningsih
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 2, No 1 (2017): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

This research aims to compare the internal consistency of reliability coefficient on classical test theory. Estimation accuracy of internal consistency reliability coefficient used several methods of the coefficient reliability formulation. The methods are Split-Half Method, Cronbach Alpha formula, and Kuder Richardson formula. Determination of the test reliability coefficients used also some formula and then their results were compared with the results of their estimation accuracy. This research is a quantitative descriptive. Data were analyzed based on responses of national chemistry examination in Jambi province on academic year 2014/2015. The data of students answer sheets were taken using proportional stratified random sampling technique. There are 200 students’ responses from 162 schools (132 public schools and 30 private schools) in Jambi province. The form of data were dichotomy data and analyzed using Split-Half Method. Their reliabilities were analyzed using Cronbach Alpha formula and Kuder Richardson formula. Reliability criteria used consist of five conditions, they are 0.5; 0.6; 0.7; 0.8 and 0.9. The results of this research indicated that (a) the coefficient of reliability in classical test theory developed by measurement experts (using Split-Half Method, Cronbach Alpha formula and Kuder Richardson formula) have varying estimates of accuracy; (b) average reliability coefficients have the precision estimation about of 0.78 up to 0.8; (c) the reliability coefficient using Spearman Brown formula was 0.78, with Rulon formula was 0.78, Flanagan formula was 0.77, Cronbach Alpha formula was 0.838, the KR20 formula was 0.838, and KR21 formula was 0.821.

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