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Author Topic: help with concentration of Al in mixed salt stock solution  (Read 4342 times)

Offline holly09

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Hi all. I really need the answer to this question.
A stock solution of aluminium is to be prepared by dissolving 12346mg of Al2(SO4)3.18H2O in water and made up to 1000ml. What is the concentration of Al in this stock solution? The molecular weight of the compound is 666.4 and the atomic weight of Al is 26.98. From these I have worked out that there is 499.8 mg/l Al in the solution.
Is this correct or do I need to include something else in this calculation. Help :(


 

Offline Bored chemist

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help with concentration of Al in mixed salt stock solution
« Reply #1 on: 29/06/2009 21:19:43 »
Close.
You forgot to count the Aluminium atoms in the molecule.
 

Offline holly09

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help with concentration of Al in mixed salt stock solution
« Reply #2 on: 29/06/2009 22:55:30 »
how do i do that [:-[] do i multiply by 2 giving me an almost 1000ppm solution?
« Last Edit: 29/06/2009 23:12:22 by holly09 »
 

Offline Chemistry4me

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help with concentration of Al in mixed salt stock solution
« Reply #3 on: 30/06/2009 06:17:56 »
Yes, that sounds right.
 

Offline Jennifervn

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help with concentration of Al in mixed salt stock solution
« Reply #4 on: 03/07/2009 04:53:08 »
Thanks for your post. Itís really useful  [O8)].
Spammy Spam, banned and blacklisted!
« Last Edit: 04/07/2009 11:01:04 by BenV »
 

Offline Chemistry4me

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help with concentration of Al in mixed salt stock solution
« Reply #5 on: 03/07/2009 04:54:32 »
Yeah, and thanks for your hidden spam message  [O8)]
 

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help with concentration of Al in mixed salt stock solution
« Reply #5 on: 03/07/2009 04:54:32 »

 

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