ChemCed Posted August 22, 2008 Share Posted August 22, 2008 in our chem experiment we combined sulfur and iron in a test tube... it stained and we were suppose to replace the test tube... what chemical would take away this stain? Link to comment Share on other sites More sharing options...
frosch45 Posted August 22, 2008 Share Posted August 22, 2008 Iron sulfide, tough to clean http://www.freepatentsonline.com/6887840.html But if this is a homework question, you could heat it to its melting point and pour it out and if you're up for a bit of lite reading... http://www.wipo.int/pctdb/en/wo.jsp?wo=2007038403&IA=WO2007038403&DISPLAY=DESC I remember we did this expiriment in my introductory year of chemistry and my teacher said that there was nothing we could do to clean it, but that might have just been because she was a bitter hateful mean stupid dumb teacher that would never do anything interesting for us..... </evil past thoughts> Link to comment Share on other sites More sharing options...
DrP Posted August 22, 2008 Share Posted August 22, 2008 would a long soak in a base bath followed by physical scrubbing do the job? Link to comment Share on other sites More sharing options...
frosch45 Posted August 22, 2008 Share Posted August 22, 2008 You know, that's what I origionally thought..... I just couldn't find any support for it online Link to comment Share on other sites More sharing options...
DrP Posted August 22, 2008 Share Posted August 22, 2008 You know, that's what I origionally thought..... I just couldn't find any support for it online Nor could I. That's why I worded my post as a question rather than a statement of advice. I had a quick skim round and one of the pages I found had a sentance connecting ammonia and disolving Iron Sulphide/ates so that got me thinking that my origional thought about the base bath might be OK. I'd leave it in there for a couple of days to soak and then scrub it up to see what happens. Link to comment Share on other sites More sharing options...
John Cuthber Posted August 23, 2008 Share Posted August 23, 2008 What soluble form could a base bath convert the iron into? It's quite possible that the heat of the Fe +S reaction will have partly melted the glass in which case cleaning it won't help. On the other hand, if it's just got FeS stuck to it, then you need something that will dissolve FeS. What is the classic way of making H2S in a lab? Link to comment Share on other sites More sharing options...
YT2095 Posted August 23, 2008 Share Posted August 23, 2008 Oxalic acid is usually pretty good at shifting iron stains and even potassium permanganate stains! 1 Link to comment Share on other sites More sharing options...
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