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ScienceSquirrel
International Hazard
Posts: 1863
Registered: 18-6-2008
Location: Brittany
Member Is Offline
Mood: Dogs are pets but cats are little furry humans with four feet and self determination! 
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BDH do the Convol range
http://uk.vwr.com/app/Header?tmpl=/product_range/chemical_re...
I doubt that you will be able to deal with them directly but someone like a school may be able to order for you.
You are going to need quite a bit of glass as well; burette, a few pipettes and some volumetric flasks etc so look around and find a local supplier
willing to deal with you
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jgourlay
Hazard to Others
Posts: 249
Registered: 9-7-2008
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Mood: No Mood
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Now isn't that slick!
I need to start a little company just for the purpose of dealing with all the folks who only deal with companies.
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ScienceSquirrel
International Hazard
Posts: 1863
Registered: 18-6-2008
Location: Brittany
Member Is Offline
Mood: Dogs are pets but cats are little furry humans with four feet and self determination!
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Sodium bicarbonate BP or USP is readily available and very pure.
Heating it to constant weight yields very pure sodium carbonate which would be an effective primary standard.
If you can get a set of scales that are accurate to say 0.01g or better 0.001g that would give you results in an acid base titration that would be
accurate to ca 0.75 or 0.075% respectively working on a 25mM scale.
There will be other sources of errors, eg your technique, I assume that you have not been formally trained, and the purity of your deionised water.
If you can obtain hydrochloric acid or sulphuric acid in a good grade then you can standardise them against your sodium carbonate.
You will not be able to do anything great. But you will be able to determine the percentage sodium hydrogen sulphate in toilet cleaner to greater than
1%, which is probably better than the manufacturers' tolerance.
Part of the fun will come from working out the errors :-D
[Edited on 23-9-2008 by ScienceSquirrel]
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