Determine the density of a unknown liquid by Pycnometer method? Volume of Pycnometer?
A student collected the following data to determine the density of an unknown liquid using the pycnometer method:
- Mass of dry pycnometer and stopper: 32.4345 g
- Mass of pycnometer + stopper + water: 58.0558 g
- Mass of pycnometer + stopper + unknown liquid: 52.8734 g
- Temperature of the water: 23.0 °C
The temperature is used to find the density of water at that temperature, which I have determined to be 0.997538 g/cm³.
I have two questions:
1) How do I calculate the volume of the pycnometer? 2) How do I determine the density of the unknown liquid?
I honestly have no idea how to answer these two questions. Can someone please explain? Thank you.
2 Answers
take the mass of the pycnomete + stopper + unknown liquid and subtract the mass of the pycnometer + stopper
52.8734g – 32.4345g = [mass of unknown liquid]
Then find the volume of the unknown liquid, which is the same as the volume of the pycnometer, which is the same as the volume of water inside the pycnometer.
the volume of water is the mass of water: mass of stopper+pycnometer+water – mass of pycnometer+stopper
58.0555g – 32.4345g = [mass of water]
Then use the density of water to determine the volume of water:
d= m/v == v=m/d
v = [mass of water] 0.997535g/cm^3
now you have the volume of the pycnometer and the mass of your unknown liquid.
to find the density of that liquid just divide the liquid’s mass by the volume of the pycnometer.
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