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Chemistry Olympiad question

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Can anyone help me with the first question?!

I started it off but I'm not sure where I could go from here

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Reply 1
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Pigster
20
Attachments don't work, for me at least.
Reply 2
Avatar for Mimi97
Mimi97
5
Original post by Pigster
Attachments don't work, for me at least.


Ditto, try re-uploading them, OP.


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Original post by Mimi97
Ditto, try re-uploading them, OP.


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Attachment not found


ImageUploadedByStudent Room1452541299.591805.jpg

Is it working ?



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Reply 4
Avatar for Mimi97
Mimi97
5
Still can't see the actual question. I can see an image of you having done some working out. Not sure why the other image isn't showing up for me, though.


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Original post by Mimi97
Still can't see the actual question. I can see an image of you having done some working out. Not sure why the other image isn't showing up for me, though.


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ImageUploadedByStudent Room1452767221.386984.jpg


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Original post by Lilly1234567890


Hopefully it works now ?!


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Reply 7
Avatar for Mimi97
Mimi97
5
First remember these relationships:

Mass= Moles*Molecular mass

Mass is in grams.
Moles is in mol.

Moles= Concentration*Volume

Concentration is in moldm-3
Volume is in dm3



You're given the amount and concentration of EDTA, so you can work out the moles.

Use the stoichiometry of the equation to deduce the amount of Cu+2. There's a 1:1 ratio of Cu+2 and EDTA.

Next you need the mass of Cu+2, so you use the amount and the atomic mass to work that out.

Working out percentage is easy. I've tried to work you through the question so next time you'll know how to figure it out. Let me know if you need clarification. :smile:


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(edited 8 years ago)
Original post by Mimi97
First remember these relationships:

Mass= Moles*Molecular mass

Mass is in grams.
Moles is in mol.

Moles= Concentration*Volume

Concentration is in moldm-3
Volume is in dm3



You're given the amount and concentration of EDTA, so you can work out the moles.

Use the stoichiometry of the equation to deduce the amount of Cu+2. There's a 1:1 ratio of Cu+2 and EDTA.

Next you need the mass of Cu+2, so you use the amount and the atomic mass to work that out.

Working out percentage is easy. I've tried to wake you through the question so next you'll know how to figure it out. Let me know if you need clarification. :smile:


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thanks ! I got it !!!
have you done the chemistry olympiad for 2016 yet how was it

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