10.5 The Reaction of Sodium Hydroxide and Carbon Dioxide

Carbon dioxide is a weak acid. It first neutralises the sodium hydroxide solution (causing the indicator to change from purple to green) and then produces a slightly acidic solution (causing the indicator to change from green to red / yellow).

[@EpicGambas]

Today in "What you should never do in a lab"
Jk nice video

[@Inttiv]

Thank you very much for your video and explanations!!
This all helped me a lot with my homework at University!

[@kikook222]

We did a similar thing in my Earth Science class at my college. Instead of adding dry ice, she just blew into the solution with a straw until we saw a change of color.

[@fycsydney]

It's calcium hydroxide rather calcium chloride (a base is needed to react with the acidic carbon dioxide.
Ca(OH)2 + CO2 --> CaCO3 + H2O

[@shaorui.0789]

thx for the equation

[@paramidhananjani1450]

thanks from 2021

[@neogeo8267]

Love the demonstration itself but really dislike the nonchalant safety and handling of an extremely caustic material, thermally dangerous dry ice and then breathing in of pure co2 / oxygen deprivation risk. kmon man. People who don't know better (including kids) are watching this stuff and will take this bad lesson and consider it normal/ok. Please consider recreating this in a less cavalier way - it was really otherwise very nice.

[@jamesaberdour6457]

Shush

[@tyronecaeciliuslaquisharom9864]

shush

[@abeastyt7750]

Shush

[@thennarasuvinu9119]

Which indicator you are using

[@mmh9816]

What a magic, thank you for the video!
So does the solution turn yellowish because of the excess of co2 turning water into weak acid after its reaction with naoh?

[@namjoon_bts143]

❤❤

[@whatthefunction9140]

Does sodium bicarbonate precipitate out

[@tehPWNINATOR]

ermm should he be holding dry ice in his bare hands like that????

[@ShristyKumari-wd4go]

14 years😳

[@wijpke]

Great now I can use it to remove CO2 in my submarine 😂❤

[@eiliannoyes5212]

carbon dioxide is not the acid here, but its solution in water - carbonic acid

[@nerdsup2012]

It is na2co3 and h20

[@nidheeshgupta2395]

Woow Beer!

[@omeander]

Does the dry ice bubbling away generate molecular hydrogen?

[@fycsydney]

The solid carbon dioxide turns into gas carbon dioxide. The bubbles contain molecules of CO2

[@marx875]

How to make h2c2 by dissolving o2 with sodium?

[@jerrybacker3079]

Lol 😂 seen the fog go up his nose

[@HenriBriones]

can you pase me the aticle, please?

[@ToZanarkandLover]

The guy says sodium hydroxide, not calcium... (at 0:39 - 0:41)

[@commonsense-og1gz]

is the sodium hydroxide absorbing the co2 to form sodium bicarbonate?

[@evilplaguedoctor5158]

If I understand correctly, it should (though not directly, first the Co2 will react with the water forming H2CO3, then with the NaOH to form your bicarbonate. but I'm not a good source (I'm actually trying to research this myself, if I can do that reaction at once, or if I have to do it in seperate steps..)

[@joelserrao1078]

@@evilplaguedoctor5158 have you finished your research??

[@evilplaguedoctor5158]

@@joelserrao1078 not particularly. I went in a different direction. It was for a carbon capture project I'm working on, and frankly, nature can do this far better then we currently can. So I'm currently more focused on building an effecient bioreactor that grows both algae and azola.

[@joelserrao1078]

@@evilplaguedoctor5158 even i am working on a carbon capturing project.

[@joelserrao1078]

@@evilplaguedoctor5158 have u written any literature?

[@PeterPete]

After I've turned limewater milky I can add an acid that will turn the limewater clear. So if CO2 is acidic why does it turn limewater milky to begin with? Anyone care to answer the question?

[@devilbutcher2933]

CaO(clear) + CO2 --------> CaCO3 (white)
CaCO3 + 2HCl --------> CaCl2(clear) + CO2 + H2O

[@devilbutcher2933]

CaCO3(white) + H2SO4 --------> CaSO4(clear) + CO2 + H2O

[@devilbutcher2933]

CaCO3(milky) + 2HNO3 ---------> Ca(NO3)2 (clear) + CO2 + H2O

[@devilbutcher2933]

is there any other acid to mention the reaction ?

[@PeterPete]

@@devilbutcher2933 that formula is wrong imo if you use natural limestone - CACO3 + H2SO4 would give you SO2 and not CO2!! Any wet universal paper would turn red not yellow in contact with the gas thereby showing the presence of something that is not CO2!
This would also mean there is no carbon produced from a natural limestone + H2SO4 reaction??
But you still haven't answered the question - if an acid turns milky limewater clear and if CO2 is an acidic gas, then why does limewater turn milky in the presence of CO2?

[@eiliannoyes5212]

not "sublime", but "sublimate"

[@spratyey]

What's the equation for this?

[@Able0the0fox]

I believe it is 2 NaOH & CO2 = Na2CO3 (Sodium Carbonate) & H2O

[@DANGJOS]

It's fine as long as it isn't held too long

[@alexandradelliou]

2020: 4580

[@eiliannoyes5212]

carbon dioxide is not the acid here, but its solution in water - carbonic acid