Frequently Asked Questions...
heat of evaporation - 10 points first correct procedure?
A Florence (or boiling) flask, made with Pyrex® glass, is filled to the brim with 500 mL of water at 100 °C. If the temperature in the lab drops to 42 °C, how much water (in ml) could be added to the flask to fill it back to the brim?
Answer:
This is a problem in thermal expansion, or density changing with temperature.
If you have a table showing the density of water at different temperatures, you can calculate how much the volume shrinks when the temperature is changed from 100 C to 42 C. That amount will be your answer.
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Pyrex Lab
[Lab 14] Sealing a Pyrex Flask Under Vacuum
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