phychem lab rep 1 - EXPERIMENT NO. 2 MEASUREMENT OF DENSITY...

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EXPERIMENT NO. 2 MEASUREMENT OF DENSITY AND DETERMINATION OF PARTIAL MOLAR VOLUME OF ETHANOL-WATER SYSTEM GROUP NO. 2 CABUNGCAL, Ma. Andrea Danita E. ChE-2 / 2008140407 Abstract This Final Report discusses about the principles we had applied regarding the measurement of density and determination of the partial molar volume of our ethanol-water system. It explains how changing the molecular environment of an introduce substance greatly affects the total or overall density of the mixture. I had also included the procedures we did and the list of apparatuses we used. At the end of this report, the table for our data is found and the fitted graph. Based from the graph of the change in volume versus mole fraction of water, it shows an inverse relationship or negative slope. This implies that as we increased the amount of moles of water, the molar change of the mixture changes its structure different with simply adding like molecules. I have also included the results and a list of references. Introduction In this experiment, we were expected to be familiarized with the use of pyncnometer in measuring the density of a liquid. Furthermore, we used this instrument in measuring the temperature of the liquid sample. Through this, we were also able to determine the partial molar volume of ethanol-water system. A popular note for volume is that it is an additive property. Basically, when we add a certain amount or volume x, of a solvent with another solvent which has the same properties (e.g. water-water or chlorine-chlorine), the resulting solution would simply be the quantitative sum of the added volume with that of the initial volume of the solvent (x+x). However, in this experiment, we had discovered that volume wouldn’t prove to be an additive property all the time. It showed that as we added water with our pure ethanol sample, the expected
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EXPERIMENT NO. 2 MEASUREMENT OF DENSITY AND DETERMINATION OF PARTIAL MOLAR VOLUME OF ETHANOL-WATER SYSTEM GROUP NO. 2 CABUNGCAL, Ma. Andrea Danita E. ChE-2 / 2008140407
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This note was uploaded on 04/27/2011 for the course CHM 170 taught by Professor Ng during the Spring '11 term at Mapúa Institute of Technology.

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phychem lab rep 1 - EXPERIMENT NO. 2 MEASUREMENT OF DENSITY...

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