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Author Topic: Analysis of an aluminum-zinc alloy using HCl  (Read 12560 times)

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buckminsterfullerene

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Analysis of an aluminum-zinc alloy using HCl
« on: November 05, 2007, 03:24:42 PM »

errmm.... the packet that is supplying me with the information on how to solve these kind of problems is making little sense to me, and I am supposed to write a lab report on that, can't really accomplish that unless I comprehend what is going on and how do the equations, which at this point seem to be all over the packet, work.

a link to a site that has helpful information is welcomed, but if you know anything to the perspective, please respond, and thanks in advanced.

-Daniel Garcia
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buckminsterfullerene

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Re: Analysis of an aluminum-zinc alloy using HCl
« Reply #1 on: November 05, 2007, 05:36:03 PM »

perhaps some information might help.

it seems, after reading the packet a couple times, the main equation to be used in order to determine is going to be:

n(H2) = (0.0556 moles H2 / gAl) * X*gAl + (0.0153 moles H2 / gZn) * (mass of sample - X)

where X is apparently the mass of Aluminum, (mass of Al -X) is the mass of Zinc

that is that for the equation they give that I still have to try and make some sense about.

as for the value that I have acquired through the experimentation, at least the values that are significant:
trial 1
mass of alloy = .104 g
displaced water = 122.5 mL (we are to assume density of the water is 1.00 g/mL to determine the the amount of hydrogen gas available)
the temperature was 22 Celsius (of the water that is)
barometric pressure = 761.4 mm Hg
pressure of water = 19.87 mm Hg
pressure of hydrogen = 741.6 mm Hg

and I am supposed to determine the mass of Al, Zn the percentage of Al and Zn.

I am not asking for you to do the work, but to tell me how this works, I am completely lost...

(P.S. use ideal gas laws... do not get too technical, this is a beginners chemistry course, sort of)

if you feel like giving the response rather than explaining that will also help, I could use a response to try and work it backwards, answers by themselves are pretty useless for me though as I have to also write a lab report explaining everything.
uggh...
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buckminsterfullerene

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Re: Analysis of an aluminum-zinc alloy using HCl
« Reply #2 on: November 06, 2007, 04:34:59 AM »

perhaps some information might help.

it seems, after reading the packet a couple times, the main equation to be used in order to determine is going to be:

n(H2) = (0.0556 moles H2 / gAl) * X*gAl + (0.0153 moles H2 / gZn) * (mass of sample - X)

where X is apparently the mass of Aluminum, (mass of Al -X) is the mass of Zinc

that is that for the equation they give that I still have to try and make some sense about.

as for the value that I have acquired through the experimentation, at least the values that are significant:
trial 1
mass of alloy = .104 g
displaced water = 122.5 mL (we are to assume density of the water is 1.00 g/mL to determine the the amount of hydrogen gas available)
the temperature was 22 Celsius (of the water that is)
barometric pressure = 761.4 mm Hg
pressure of water = 19.87 mm Hg
pressure of hydrogen = 741.6 mm Hg

and I am supposed to determine the mass of Al, Zn the percentage of Al and Zn.

I am not asking for you to do the work, but to tell me how this works, I am completely lost...

(P.S. use ideal gas laws... do not get too technical, this is a beginners chemistry course, sort of)

if you feel like giving the response rather than explaining that will also help, I could use a response to try and work it backwards, answers by themselves are pretty useless for me though as I have to also write a lab report explaining everything.
uggh...


n(H2) = (0.0556 moles H2 / gAl) * X*gAl + (0.0153 moles H2 / gZn) * (mass of sample - X)
never mind, that equation just got me really confused, but it was simple after all, I just thought that I had three different unknown values and did not realize that whoever wrote the packer wrote what X was in the equation itself rather then outside, lol.

X is the mass of Aluminum so in reality the equation comes out being


n(H2) = (0.0556)X + (0.0153)(mass of sample - X)
and I would solve for X, very simple indeed, lol.
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ajrobb9109

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Re: Analysis of an aluminum-zinc alloy using HCl
« Reply #3 on: January 04, 2009, 08:22:06 AM »

so how would go about finding the %Al?
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artem.metelskiy

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Re: Analysis of an aluminum-zinc alloy using HCl
« Reply #4 on: April 20, 2011, 02:50:12 PM »

We are going to do this lab next week and I'm very confused about all those formulas
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