Cleaning evaporating dishes

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agregory
Posts: 56
Joined: 01 Nov 2010, 13:19
Job Title: Lab Assistant
Suburb: Townsville
State/Location: QLD

Cleaning evaporating dishes

Post by agregory »

We have some evaporating dishes which have been used for an Evaporating Coca Cola Prac. The dishes have had the Coke burned onto them terrible and nothing will get it off (scrubbing, bleach, HCl).

Any help?
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smiley
Posts: 1398
Joined: 20 Nov 2006, 10:00
State/Location: QLD

Re: Cleaning evaporating dishes

Post by smiley »

Try soaking them in a fairly strong Napisan solution. Leave them overnight at least, or even longer. Works on ceramics at home too!
Cheers, K 8-)
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dime
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Joined: 13 Jun 2007, 09:55
State/Location: NSW

Re: Cleaning evaporating dishes

Post by dime »

If you don't have napisan, you can use sodium hydroxide about 2M. Leave to soak for a couple of days, and the black coke comes off completely.
ana.santos
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School: Mary Mackillop College
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Re: Cleaning evaporating dishes

Post by ana.santos »

I had the same problem with burning magneium in crucibles. Tried soaking in nitric acid and scrubbed with steel scrubber but some still have some marks on them. :mad:

Ana
agregory
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Joined: 01 Nov 2010, 13:19
Job Title: Lab Assistant
Suburb: Townsville
State/Location: QLD

Re: Cleaning evaporating dishes

Post by agregory »

Thanks!
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Krysia Lee
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Re: Cleaning evaporating dishes

Post by Krysia Lee »

Something I got from this site was to put a liitle rice, sand and water in the bottom of the evaporating basin with a magnetic stirrer and let it go till clean. Works a treat.
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