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# Vescosity Test

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Introduction

Viscosity Test Planning (a) Aim To determine which of these: diethyl ether, Propionic acid, 1-butanol, and 1-hexanol are most viscous through an evaporation method. Hypothesis Propionic acid is going to be the most vicious because the stronger the intermolecular forces the more viscous. Its molecular formula is C3H602, the C is bonded to an OH and the C is also double bonded to an O. Therefore, there are strong intermolecular forces, like hydrogen bonds. Also the double bonded oxygen has a lone pair attracting the electropositive H creating a dipole moment. Selecting Variables The independent variable is the chemical and the dependant variable is the change in mass (g). The controlled variables are the volume (ml), the same door height of the fume cupboard, the time (s) interval and to the fix problems with density we are going to take the percentage of change in mass. Planning (b) Method 1. Use a Pertri dish (to support the filter paper) 2. Tare the scales 3. Find and record the mass of the filter paper. 4. Drop the chemical onto the filter paper. ...read more.

Middle

The time interval is going to be of 15s: one experiment when the mass is recorded at the first 5s and then at 20s. The other is experiment is when the mass is recorded in the first 10s and then after 25 s. then take the result which seem to be more reasonable. The some chemical are denser than others and to control that problem we take the percentage of the mass lost. Data Collection/ Processing and Presentation Table one Mass(g) � 0.001 Before at (5 � .1s) Mass(g) � 0.001 After at (20 � .1s) Difference of Mass(g) � 0.001 Diethyl Ether 1.41 1.20 0.21 1-Butanol 1.42 1.55 -0.13 Propinoic Acid 1.74 1.77 -0.03 1-Hexanol 1.64 1.62 0.02 The results are not reasonable so we did the experiment again but this time the first mass recorded is at 10 s and the final mass is recorded at 25s. Table 2 Mass(g) � 0.001 Before at (10 � .1s) Mass(g) � 0.001 After at (25 � .1s) ...read more.

Conclusion

Viscosity (cP) Diethyl Ether 0.224 at 25 �C 1-Butanol 3 at 25�C Propinoic Acid 10,000 1-Hexanol - The table above shows the literature value for three of the chemicals. And from this we can see that Propionic acid is the most vicious. There were few errors, while doing the experiment, one was the scales. It would not read a same number for more than 3s so we had to take the modal average for the masses. Also we used a stop watch and we might have noted the mass too early or too late. The pipette was a nuisance to use it was a pipette which measure 1 ml and it was hard to get exactly 1 ml but we managed. To improve this experiment we should use more of the chemical so that the time difference could be longer and we would get a better result for the change in mass. This method can determine which chemical is the most viscous but it cannot give us an exact number telling us which chemical is most viscous. Aysweria Naathan 21-March-2007 IB HL Chemistry Y1 ...read more.

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