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Author Topic: Aluminium Potassium Sulphate & Chemical Suppliers  (Read 4757 times)

Offline Yaglaser

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I bought a chemistry set for my sons last weekend and the instructions stated that, to do all the experiments, more copper sulphate and aluminium potassium sulphate (APS) would have to be purchased. The copper sulphate is not a problem, but the APS appears to be available in two forms: APS 12-WATER LR and APS 24-water LR. The APS in the chemistry set is 24-water (LR is not mentioned), but the type available from a UK supplier is 12-WATER LR. Would the 12-WATER LR be okay?

Also, can anyone suggest a chemical supplier that sells small quantities of chemicals? The smallest weight I've found so far is 500g.

Thanks.
« Last Edit: 01/08/2009 10:41:46 by Yaglaser »


 

Offline lightarrow

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« Reply #1 on: 01/08/2009 12:51:13 »
I bought a chemistry set for my sons last weekend and the instructions stated that, to do all the experiments, more copper sulphate and aluminium potassium sulphate (APS) would have to be purchased. The copper sulphate is not a problem, but the APS appears to be available in two forms: APS 12-WATER LR and APS 24-water LR. The APS in the chemistry set is 24-water (LR is not mentioned), but the type available from a UK supplier is 12-WATER LR. Would the 12-WATER LR be okay?

Also, can anyone suggest a chemical supplier that sells small quantities of chemicals? The smallest weight I've found so far is 500g.

Thanks.
If the experiments involving APS don't require exacts, weighed amounts of the compound (as I think it is), then it's the same.
 

Offline Bored chemist

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« Reply #2 on: 01/08/2009 19:31:06 »
Whether or not they involve exact amounts they are the same

KAl(SO4)2 .12 H2O is the same as
K2SO4Al2(SO4)3 24H2O
 

Offline lightarrow

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« Reply #3 on: 01/08/2009 21:10:31 »
Whether or not they involve exact amounts they are the same

KAl(SO4)2 .12 H2O is the same as
K2SO4Al2(SO4)3 24H2O
Do they really mean this? It's the same formula! Bad teachers at school... :)
 

Offline Bored chemist

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« Reply #4 on: 01/08/2009 21:33:35 »
It depends on whether you look at it as derived from the two separate salts
K2SO4 and
Al2(SO4)3
stuck together with 24 molecules of water or as a compound in its own right.
 

Offline lightarrow

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« Reply #5 on: 02/08/2009 12:08:16 »
It depends on whether you look at it as derived from the two separate salts
K2SO4 and
Al2(SO4)3
stuck together with 24 molecules of water or as a compound in its own right.
Thanks.
 

Offline Yaglaser

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« Reply #6 on: 02/08/2009 13:54:15 »
Thanks for your help. They are the same, then. The supplier that I hope to buy it from only sells it in 500g containers @ about 6 per unit. I'll have to make sure that I use it in plenty of experiments, to get my money's worth ::)
 

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Aluminium Potassium Sulphate & Chemical Suppliers
« Reply #6 on: 02/08/2009 13:54:15 »

 

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