What apparatus can be used to capture H2O gas in a lab experiment?

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Discussion Overview

The discussion revolves around the experimental setup required to capture water vapor (H2O gas) generated from the heating of magnesium sulfate heptahydrate (MgSO4·7H2O) in a laboratory setting. Participants explore various apparatus options that can withstand high temperatures while allowing for the collection of gas.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant describes a method of heating MgSO4·7H2O in a crucible and expresses a desire to capture the resulting H2O gas, seeking advice on suitable apparatus.
  • Another participant suggests using high temperature (96% silica) glassware along with a Liebig's condenser, noting that silica glass can withstand temperatures up to nearly 1000C, which is suitable for the experiment.
  • A different participant proposes the idea of using a simple glass retort as an alternative setup for capturing the gas.

Areas of Agreement / Disagreement

Participants present multiple suggestions for apparatus but do not reach a consensus on a single solution. The discussion remains open with various proposed setups.

Contextual Notes

There are considerations regarding the temperature ratings of different types of glassware and the specific requirements for sealing and gas collection that remain unresolved.

Who May Find This Useful

Researchers or students conducting experiments involving the dehydration of hydrates and the capture of gaseous products in a laboratory setting.

MichaelXY
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In a lab experiment we put some MgSO4 7H2O into a crucible, and brought it to a high temperature using a Bunsen burner. After 10 minutes of heating we massed out the crucible and contents to determine the % of H2O.
Okay, I had no problem with this, and my question is this. I wish to take this experiment a step further and actually capture the H2O gas into another container so I can mass out the H2O.

I can picture a setup being similar to stated above except I would need a sealed crucible with a gas port, and another sealed container to receive the gas. My problem is that I do not know what apparatus I would use that would have the same heat resistant properties of a crucible, have a sealed lid, and also have a gas port. Does anyone know what such a apparatus would be called?

Thanks
 
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High temperature (96% silica) glassware and a Liebig's condenser, ought to do the trick. You actually only need to go a little above 200C to dehydrate MgSO4.xH2O of all its hydrates, but if you want to be sure, take it up to say, 300C. Borosilicate glass is rated for only about 220-240C, but silica glass is rated for up to nearly 1000C.
 
Thanks for the reply. So do you think a setup like shown below would work?

condensor.jpg
 
what about a simple glass reort.
 

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