• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Vescosity Test

Extracts from this document...


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.


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.


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.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our International Baccalaureate Chemistry section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related International Baccalaureate Chemistry essays

  1. Chemistry Extended Essay - Viscosity of Xanthan Gum solutions

    It is commonly used as a thickener and stabiliser in food products, from salad dressings to gluten-free bread4. It is readily soluble in water, forming highly viscous gels even at low concentrations. It is also a very stable compound that does not spontaneously react over a wide pH range or with any salts5.

  2. Chemistry Laboratory Report --- Evaporation: Intermolecular Attractions

    Explanation * From Table 1, we can see that non-polar liquids tend to have a greater temperature difference, indicating that it cool down faster, than polar chemicals. This can be explained by the intermolecular forces of the molecules. Non-polar molecules have weaker intermolecular forces, with only van der Waals'

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work