Thermal Decomposition of Carbonates
Posted 31 March 2005 - 09:00 AM
My thoughs as such are; we heat the carbonate (as a solid - possibly in water [but NOT aqueous]), and using limewater - test at what temperature carbon dioxide is released.
My question is - is this approach feasible, what equipment will I need, is there a better way of proving the hypothesis. I have access to varoius carbonates, limewater, and ordinary lab equipment (glassware, bunsens, filtration devices, etc)
Posted 31 March 2005 - 09:38 AM
Sodium Carbonate is more readily decomposed than Calcium Carbonate.
Not true! Calcium carbonate decomposes at much lower temperatures. If you want to explore decomposition temperatures of carbonates you need very strong heating. I suppose that some alkali metal carbonates do not decompose even in bunsen burner flame.
Posted 31 March 2005 - 10:10 AM
AH yes - I got it the wrong way round - the actual hypothesis I had to test experimentally is:
Not true! Calcium carbonate decomposes at much lower temperatures.
"that the ease of decomposition of carbonates is in the reverse order of the Periodic Table"
that being from easiest to most difficult, not the way around - as I had initially interpreted it.
When heating it (at such high temperatures), what would be the best way to collect the carbon dioxide let off? Or again - as I asked in my original post - is there some easier way to do it?
Posted 31 March 2005 - 11:48 AM
Some of carbonates can be decomposed in test tube. You have to put bent tube (usally glass is used, but when collecting CO2 metallic tubes are as good) through stopper and collect gas to flask or graduated cylinder that is capsized on water tank.
Posted 31 March 2005 - 02:34 PM
Posted 31 March 2005 - 03:11 PM
Posted 31 March 2005 - 11:35 PM
thermally, now that's different
Posted 1 April 2005 - 07:33 AM
Posted 1 April 2005 - 07:57 PM
Posted 2 April 2005 - 02:45 PM
Posted 2 April 2005 - 11:50 PM
Posted 3 April 2005 - 04:22 AM
my teacher used to tell me sodium carbonate doesn't decompose on heat
I was under the impression that every compound would decompose if enough heat was added...BTW your teacher sounds lost is he a PE teacher?
Posted 4 April 2005 - 03:21 AM
Posted 4 April 2005 - 02:51 PM
Even the Haber process and Le Chaterlier's Principle are not required in my exams, I bet I'll learn more at A level
Posted 4 April 2005 - 02:57 PM
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