H2SO4 Posted March 29, 2005 Posted March 29, 2005 sorry, i mustve not been watching wat i was typing, i meant calcium carbonate Simple mistake ya, ancient methods never work. I didnt know potassium carboante could decompose to calcium oxide. ill have to try it
YT2095 Posted March 29, 2005 Posted March 29, 2005 ya, ancient methods never work. you have GO TO BE kidding right!?
jdurg Posted March 29, 2005 Posted March 29, 2005 If you tack on 'to produce large quantities', then yes, the statement is correct.
akcapr Posted March 29, 2005 Author Posted March 29, 2005 \ ya' date=' ancient methods never work. I didnt know potassium carboante could decompose to calcium oxide. ill have to try it[/quote'] u kidding me! U did it again
akcapr Posted March 30, 2005 Author Posted March 30, 2005 if u get the potassium hydrogen carbonate, if u heat it to mauch wont you just decompose it back into KOH. How would u make sure not to release the co2 and only the hydrogen?
YT2095 Posted March 30, 2005 Posted March 30, 2005 it decomposes at 100c to the carbonate, to go beyond this you`de need alot of heat! it`s unlikely you`ll manage to get that high in a kitchen oven
BenSon Posted March 30, 2005 Posted March 30, 2005 I thought he'd use a stove? Anyway... Ive read before that it decomposes at 100C to CO2 and KOH are you sure it decomposes to the carbonate at 100C ~Scott
H2SO4 Posted March 30, 2005 Posted March 30, 2005 i wouldnt use a kitchen stve, ive got MAPP gas burners in my lab
BenSon Posted March 30, 2005 Posted March 30, 2005 How hot to those burners get my stove can easily melt zinc (420C) and ive melted a small amount of aluminium (660) before (It mostly oxidises before it melts). Im not sure it would be worth upgrading to a stronger burner because dont realy need anything to get that hot...but if their not tooo expensive, could it hurt? ~Scott
YT2095 Posted March 30, 2005 Posted March 30, 2005 I thought he'd use a stove? Anyway... Ive read before that it decomposes at 100C to CO2 and KOH are you sure it decomposes to the carbonate at 100C ~Scott it should behave in the same way that sodium bicarbonate does, in fact one of the problem inherant with KOH is that left in the open, it`ll readily absorb CO2 from the atmosphere and react.
BenSon Posted March 30, 2005 Posted March 30, 2005 Just making sure Looks like you can't believe everything you read ~Scott
YT2095 Posted March 30, 2005 Posted March 30, 2005 no problem this isn`t a great link, but see the bit in the Green: http://216.239.59.104/search?q=cache:WEVgAlfKCaQJ:www.armandproducts.com/pdfs/PotBiVs6.PDF+%22potassium+carbonate%22+bicarbonate+decomposition&hl=en and here: http://tesscorpeng.tessenderlogroup.com/popup.asp?doctype=Product&id=020160117
H2SO4 Posted March 30, 2005 Posted March 30, 2005 benson, i can braze with my MAPP gas burner. I have a homemade bunsen burner that can operate on mapp, or propane, it hooks into my blowtorch regulater. Real simple and it works.
YT2095 Posted March 30, 2005 Posted March 30, 2005 benson, i can braze with my MAPP gas burner. I have a homemade bunsen burner that can operate on mapp, or propane, it hooks into my blowtorch regulater. Real simple and it works. wise minds think alike it would seem, your setup is identical to mine
BenSon Posted March 30, 2005 Posted March 30, 2005 Wow thats hot Whats the damage on a burner like the one youve got? ~Scott
YT2095 Posted March 30, 2005 Posted March 30, 2005 free, it`s all homemade from scrap bits of junk I seem to collect everywhere I go
BenSon Posted March 30, 2005 Posted March 30, 2005 I knew i should have taken metalwork instead of woodwork ~Scott
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