Saturday, November 30, 2013

Gases Lab Test

Hello, I hope you all had a nice break. I was wondering if you guys had any ideas for the gases lab test--I feel like we're supposed to use a eudiometer like we did for the last lab, but I can't figure out how to get the mystery gas from the tank to the eudiometer. Does anyone know how to solve this or have any better ideas?
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8 comments:

  1. AnonymousDecember 1, 2013 at 12:03 PM

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  2. AnonymousDecember 1, 2013 at 12:37 PM

    I feel like this could be solved by using a manometer (figure 5.2 on page 104 of the textbook). First, the manometer would be somewhat filled on the bottom with water (since water insoluble) and then the atmosphere would push on one side of the container and then you would have to insert the other side of the manometer inside the small "tank" of gas and find the pressure of the gas based on the difference in height. I do not know from there how to find the molar mass of the gas

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  3. AnonymousDecember 1, 2013 at 12:42 PM

    THE IDEAL GAS LAW WOULD BE USED TO FIND THE MOLAR MASS OF THE GAS: N = PV / RT. (P=pressure found from height difference, V=volume of gas, R=pressure in the same unit as daily barometric pressure, T=temperature of water) with the variables, moles would be solved for. Then, the the density of the tank could be used through dimensional analysis to find the mass of the gas. Afterwards, the molar mass could be found through dividing the mass (g) and moles of the gas. What are the flaws in the procedure or these calculations?

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  4. AnonymousDecember 1, 2013 at 8:01 PM

    Good thinking Jordan! I'm still not quite sure how to put the gas inside the manometer without contaminating it and stuff, but I'm probably just missing something.

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    1. AnonymousDecember 2, 2013 at 4:46 AM

      You're right. I do not know the specifics on putting the manometer into the tank. Maybe if it has a cork then a hole could be cut, but I do not see how that could work without letting out any gas

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  5. AnonymousDecember 1, 2013 at 9:13 PM

    Oh, and also, how do we know the density of the gas in the tank?

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    1. AnonymousDecember 2, 2013 at 4:38 AM

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  6. AnonymousDecember 2, 2013 at 9:17 AM

    Look at the video on the very bottom of the gas unit. It was very helpful in explaining how a eudiometer can be used to complete this. Oops. I think the manometer is too complicated.

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