The reverse of this would be suspended fine calcium hydroxide particles in water & is called milk of lime. The solution is called limewater and is a medium strength base that reacts with acids and attacks many metals. Limewater turns milky in the presence of carbon dioxide due to formation of calcium carbonate, a process called carbonation (blowing exhaled air through limewater for example).
Thanks for the video! I have done this myself. It is an amazing reaction to witness first hand. Making concrete from it however proved to be somewhat of a failure. I did manage to glue some small bricks together though. The mortar was extremely soft and crumbled as soon as I applied pressure to it. My next search will be what ingredients are added to make Portland cement.
So how then is limestone used as a building material???... say there is a heatwave, or said building is in a dessert... will the limestone turn into calcium oxide (and thus fizz out when it rains?)
+JG A higher heat than mere sunlight produces is required to produce quicklime. The quicklime, once slaked, was mixed with water and sand and used as mortar way back before Portland cement was manufactured . A 6 to 1 ratio, sand/lime, was frequently used; mixed with fresh water to make a trowel-able mortar.
+JG Yes, absolutely. The limestone will begin to calcine (turn to calcium oxide) when the temperature reaches something above 850 degrees C. Of course, at that temperature you will have bigger problems than your house melting in the next rain.
wonder whaty would heppen if you took that calcium oxide and put it in the furnace with carbon for 10 mins and thne tossed it in the water? I am kidding ik whats going to happen
Air is irrelevant, agreed...because the Calcium carbonate is more stable (lower enthalpy of formation) than the oxide at low temperatures and at high temperatures there is no combustion of the carbonate, rather its endothermic breakdown into oxide, via? hydroxide, and co² is favoured in free energy terms. I am not sure as to the precise sequence and mechanism of the high temperature decomposition reaction. I need to be up to speed here.
Well, I mean, be fair-- CaCO3 is only 20% metal, but then it came up to 50% with the formation of CaO. I guess it does become less metal again when they made Ca(OH)2--back down to 20%--, but overall, this video's pretty metal.
I'm not left with a very good understanding of why the last reaction is important or why people hundreds of years ago would have done it. I know it's "part of cement," but you spent all that time and money getting and messing around with these blocks, and in the end I haven't seen you do anything particularly USEFUL with them. It would have been much more interesting to see you make some actual cement.
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I am impressed with the quality of your videos: the cinematography, music, experiment and explanation.
I've used cement, mortar, concrete most of my life and am very grateful for this video. Thank you!!
Very educative, thank you
thank you a lot, im trying to find a formula to make primitive soap and this was a big key!
Great vid!
Nice video and example
Could i do the same water+quicklime reaction with sea shells?
Or is the composition not pure enough or something.
we use calsium hidroxide as a fud ingridient for pumkin candy in mexico
The reverse of this would be suspended fine calcium hydroxide particles in water & is called milk of lime. The solution is called limewater and is a medium strength base that reacts with acids and attacks many metals. Limewater turns milky in the presence of carbon dioxide due to formation of calcium carbonate, a process called carbonation (blowing exhaled air through limewater for example).
Thanks John Boy!
Thanks for the video! I have done this myself. It is an amazing reaction to witness first hand. Making concrete from it however proved to be somewhat of a failure. I did manage to glue some small bricks together though. The mortar was extremely soft and crumbled as soon as I applied pressure to it. My next search will be what ingredients are added to make Portland cement.
I think you didn't let the mortar cue for long enough. Mortar is supposed to harden up when you wait for it to cue.
Press F to pay respects.
are you saying that if i poured water on the pyramids in egypt they will fizzle into a mud-like substance?
So how then is limestone used as a building material???... say there is a heatwave, or said building is in a dessert... will the limestone turn into calcium oxide (and thus fizz out when it rains?)
+JG
A higher heat than mere sunlight produces is required to produce quicklime.
The quicklime, once slaked, was mixed with water and sand and used as mortar way back before Portland cement was manufactured . A 6 to 1 ratio, sand/lime, was frequently used; mixed with fresh water to make a trowel-able mortar.
+JG Yes, absolutely. The limestone will begin to calcine (turn to calcium oxide) when the temperature reaches something above 850 degrees C. Of course, at that temperature you will have bigger problems than your house melting in the next rain.
Quicklime was used by the romans to make cementover a millenia ago.
Like a millennium over a millennium ago.
It is still used to make cement
wonder whaty would heppen if you took that calcium oxide and put it in the furnace with carbon for 10 mins and thne tossed it in the water? I am kidding ik whats going to happen
Ca(OH)2 or Calcium Hydroxide
what is the temperature used when heated in oven? pleaaaaase reply!
CaCO3 decomposes to CaO + CO2 above 800C.
Is it possible to heat limestone in furnace in presence of air to get CaO?
Yes, air is irrelevant.
Air is irrelevant, agreed...because the Calcium carbonate is more stable (lower enthalpy of formation) than the oxide at low temperatures and at high temperatures there is no combustion of the carbonate, rather its endothermic breakdown into oxide, via? hydroxide, and co² is favoured in free energy terms.
I am not sure as to the precise sequence and mechanism of the high temperature decomposition reaction. I need to be up to speed here.
Toss it in a pool:)
and light a candle over the pool
2 CaO + multiple H2O -> 2 CaOH + 2 H2 + 2 O2 -> 2 CaOH(aq) + multiple H2O + 2 H2O + O2
Calcium oxide does not form Hydrogen when it reacts with water:
CaO + H2O --> Ca(OH)2
So... Calcium hydroxide is cement?
Calcium Silicate
vast amounts of limestone.
woow se desintegra rapidisimo! o.0
pancha
Well, I mean, be fair-- CaCO3 is only 20% metal, but then it came up to 50% with the formation of CaO. I guess it does become less metal again when they made Ca(OH)2--back down to 20%--, but overall, this video's pretty metal.
Calcium Hydroxide 3:19
Painted veil
Calcium Hydroxide
I'm not left with a very good understanding of why the last reaction is important or why people hundreds of years ago would have done it. I know it's "part of cement," but you spent all that time and money getting and messing around with these blocks, and in the end I haven't seen you do anything particularly USEFUL with them. It would have been much more interesting to see you make some actual cement.
Good eye! Wisdom isn't completely dead just rare today :)
Interesting critique
very nice video but that music...oh ..nasty
POV: you are here because of "The Story of Edgar Sawtelle"
cacium cycle
Fatherless?
I think you will find the Pyramids are made like this