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All Journal Alchemy Jurnal Penelitian Kimia Indonesian Journal of Chemical Science
Patiha Patiha, Patiha
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Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Environmental Science Materials Science & Nanotechnology

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DETERMINATION OF BACKWARDS RATE CONSTANT AND EQUILIBRIUM CONSTANT USING IRREVERSIBLE APPROACH AND FORWARD RATE LAW Patiha, Patiha
Alchemy Jurnal Penelitian Kimia Vol 9, No 2 (2013)
Publisher : Alchemy Jurnal Penelitian Kimia

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A determination technique of backward rate constant kb and equilibrium constant K using irreversible reaction approach and forward reaction rate law has been introduced. The rate law of backward reaction was determined from the integral equation that produced the smallest standard deviation of the average value of rate constant, k. These rate constants were calculated based on the difference of the concentration of products observed at various definited times to the concentration that should present if the forward reaction is irreversible. The backward rate constant, kb is the rate constant which is calculated at the beginning of the observation.  Then, in combination with the kf  value which was obtained from the forward rate law, the equilibrium constant, K, could be calculated. This technique was then tested on data of a first-order reversible reaction, on both directions. Those data were taken from Wright (2004) and Wilkinson (1980).The validity was determined based on the suitability of the values (with a tolerance of differences ≤ 5%) of kb and K which are given by Wright (2004) and Wilkinson (1980). The results show that the technique is valid.
REACTIONS KINETICS OF CH3COOH WITH Br2 AS A SIMILIAR ENZYMATIC REACTIONS Felandi, Novika Tusta; Patiha, Patiha; Pramono, Edi
Alchemy Jurnal Penelitian Kimia Vol 9, No 2 (2013)
Publisher : Alchemy Jurnal Penelitian Kimia

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The aims of the research are to prove that at certain conditions the reaction between Br2 with CH3COOH is similar to enzymatic reaction, and the value of   calculated from the Espenson equation is different with value calculated by integral method. The experiments were performed at various concentrations of CH3COOH. The reaction studied by spectroscopic method by record the changes in absorbance of Br2 at 400 nm (theabsorbance index is 160 M-1 cm-1) in each definited time range. Data were analyzed with integral equations and the reaction order was determined base on the value of regression coefficient which must be close to 1 or -1. The reaction is said to be similar to the enzymatic reaction if the order of the reaction at initial is different with the order value at the end of reaction. Data were also analyzed using Espenson and integral equation (for comparison). The results showed that at concentrations of CH3COOH 0.00150 M, 0.00100 M, and 0.00075 M and 0.00300 M Br2 the reaction is similar to enzymatic reactions. Meanwhile, at different concentrations of CH3COOH,  the κ value obtained from Espenson equation is different with the value calculated by integral method.
USE OF BATTERY CARBON AS ELECTRODES IN ARC DISCHARGE METHOD FOR FABRICATION OF CARBON-MODIFIED TiO2 Andhika, Isya Fitri; Hertiningtyas, Carissa; Aji, Ardian; Desy, Alifia; Saraswati, Teguh Endah; Patiha, Patiha
Alchemy Jurnal Penelitian Kimia Vol 10, No 2 (2014)
Publisher : Alchemy Jurnal Penelitian Kimia

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Fabrication with carbon-modified TiO2by arcdischarge method in liquid medium has been studied. This research was performed in two steps including fabrication and characterization. This fabrication was done by arcdischarge method with graphite electrodes from dry cell batteries and liquid medium suspension of TiO2 in ethanol 30, 50 and 70%. A strong current was applied to electrode as 10-50 A (20-40 V). Nanocompositesformed on the liquid medium surface were collected and characterized using X-ray diffraction (XRD),scanning electron microscope (SEM) dan energy dispersive spectroscopy (EDS) to determine crystallinity, surface morphology and the constituent elements, respectively. XRD data shows that the most effective fabrication TiO2/Karbon byliquid medium in  ethanol 50%indicated from the formation of a new peak with high intensity of TiC on 2?= 36.02°. SEM data shows that the morphology of each aggregated TiO2/Karbon compared to the morphology of TiO2.In addition, EDS data shows the presence of the element carbon, titanium and oxygen in the same area indicating that the successful formation of composite material between TiO2 dan carbon.
KAJIAN KESAHIHAN PERSAMAAN ESPENSON (1995) UNTUK REAKSI ENZIMATIS DAN YANG MIRIP Patiha, Patiha; Mudjijono, Mudjijono; Hidayat, Yuniawan; Pramono, Edy
Indonesian Journal of Chemical Science Vol 3 No 2 (2014)
Publisher : Indonesian Journal of Chemical Science

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Telah dilakukan kajian tentang kesahihan persamaan Espenson (1995). Pertama secara teoritis atas paradigma yang digunakan dan kemudian dari hasilpenerapannya pada penentuan tetapan Michaelis-Menten dari reaksi brominasi aseton.  Dikatakan sahih jika, secara teoritis konsisten dengan konsep dasar kinetika kimia dan reaksi enzimatisdan memberikan harga tetapan Michaelis-Menten yang pasti. Ditemukan bahwa persamaan tersebut tidak/kurang sahih.
STUDI KINETIKA REAKSI HIDROGEN PEROKSIDA DENGAN IODIDA PADA SUASANA ASAM R. Hakim, Arif; Patiha, Patiha; Hidayat, Yuniawan
Indonesian Journal of Chemical Science Vol 3 No 2 (2014)
Publisher : Indonesian Journal of Chemical Science

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Studi kinetika reaksi hidrogen peroksida dengan iodida pada suasana asam telah dilakukan. Tujuan penelitian ini adalah membuktikan apakah hukum laju reaksi merupakan penjumlahan, pecahan ataugabungan keduanya. Desain percobaan yang digunakanadalah metode isolasi dengan H+ dan I- dibuat berlebih terhadap H2O2.Hasil percobaan variasi konsentrasi H+menunjukan reaksi dapat memenuhi hukum laju dalam bentuk penjumlahan. Pada percobaan variasi konsentrasi H2O2, H2O2 teramati dapat berorder 0 atau 1 bergantung pada konsentrasinya sesuai dengan yang diperkirakan dari hukum laju pecahannya. Berdasarkan hasil percobaan, reaksi disimpulkan memiliki hukum laju gabungan keduanya yang lebih lanjut terbukti berdasarkan nilai konstanta laju perhitungan.
Co-Authors Alifia Desy, Alifia Ardian Aji, Ardian Arif R. Hakim, Arif Carissa Hertiningtyas, Carissa Edi Pramono Edy Pramono Isya Fitri Andhika, Isya Fitri Mudjijono Mudjijono, Mudjijono Novika Tusta Felandi, Novika Tusta Teguh Endah Saraswati Yuniawan Hidayat