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Djaka Sasmita
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada, Sekip Utara PO BOX BLS 21 Yogyakarta 55281
Chemical Engineering, Chemistry & Bioengineering Chemistry

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Spectrophotometric Determination of the CuSO4 Soret Coefficient of a CuSO4-H2O Binary Solutions System Ijang Rohman; Djaka Sasmita; Iip Izul Falah
Indonesian Journal of Chemistry Vol 1, No 2 (2001)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (4676.677 KB) | DOI: 10.22146/ijc.21946

Abstract

A spectrophotometric technique for the determination of the CuSO4 soret coefficient of a CuSO4-water binary solutions system is described. A short column of solutions is placed between horizontal metal plates that are held at different temperatures. The subsequent changes in composition due to thermal diffusion are followed by monitoring changes of transmittance near the end of the solutions column. In water, CuSO4 diffuses to the warm compartment of column. The soret coefficient of CuSO4 0.0254 molal in water agrees with the appropriate theory, i.e. 17.60x10-3 °C-1 on the average.
The Multielectrodes Oscillation System Studied by Irreversible Thermodynamics Eko Suhartono; Djaka Sasmita; RHA. Sahirul Alim
Indonesian Journal of Chemistry Vol 1, No 1 (2001)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (6104.729 KB) | DOI: 10.22146/ijc.21958

Abstract

Oscillation process that occurs in a system may be formed from non linear dynamic phenomena that far from equilibrium. Mechanism of oscillation in a chemical reaction system such as Belousov-Zhabotinski (B-Z) reaction is quite complex. For that reason, in order the irreversible thermodynamics that far from equilibrium can be more easily understood, the generation of oscillation in a system is tried to be investigated in this study. In this case, the author attempts to come up at the oscillation process coming from the potential difference between the couple of Pb and PbO2 electrodes which are parallel arranged to from eight channels in the solution of sulfuric acid with certain concentrations. The measurements of potential difference from PbllPbO2 electrode, i.e., from the eight channels all together, were done by the use of an interface connected to a computer and it worked with time interval of one second for the time duration of 5 hours. The data were then automatically recorded. Non periodic waves which were resulted from all channels have wave forms which are triangular and square. Oscillation process occurred in each channel of a couple of PbIIPbO2 electrodes can be compared with the process of spreading of action potentials that occur in nerve cells.
Co-Authors Eko Suhartono Iip Izul Falah Ijang Rohman RHA. Sahirul Alim