- #1
miniradman
- 196
- 0
Homework Statement
Ok, I have a volumetric flask filled with 67ml of ethanol and 36.38ml of water to make up 100ml of solution. My experiment was to find out how temperatue affects volume contraction. Part of my analysis was to justify how much volume contracion changed due to volume, a complicating factor involved was that some of this contracion was due to ethanol and ethanol rather than ethanol water.
The inital temperature was 23 degrees C
The Attempt at a Solution
I started out my mesuring how much the volume of ethanol changed and I calculated that it changed by 4mm and one mm equals 4.7ml, so there was a 0.85ml change in volume.
The temperature had a difference of 40 degrees C so there was difference of 0.02ml/C.
Next I found the percentage of volume change between 23 degrees and 6 degrees which worked out to be 0.125%
= (0.02/17) x 100
approx = 0.125%
I then applied this to the volume of ethanol I put in a flask which was 65ml
= 65 x (o.125/100)
= 0.08 ml/C
The problem is that when the temperature of the flask with the ethanol and water mixture decreases, the volume of ethanol decreases aswell. This means, that the contraction due to ethanol has also decreased. I have taken measurements from 7, 24, 65, 94 degrees and yes, I do have the difference in volumes. All I want are just hints to work out how much contraction is due to ethanol at each of the given temperatures.
Thanks guys, help will be appreciated ;)