chenbeier

CrO3,  H2CrO4, H2Cr2O7, etc. All are chromic acid.

On 6/1/2024 at 4:04 PM, exchemist said:

Are you referring to chromium trioxide? 

6 minutes ago, KOLM said:

Wow, Chen, I didnt know. So, even if I were to dry it out some, it would not revert back to CrO3? 

Correct, it's difficult to keep it dry after open the container.

1 hour ago, exchemist said:

Are you referring to chromium trioxide? 

Chromium-VI-trioxide CrO₃ is called in publics mouth as chromic acid.

If it get wet  then it reacts to a sludge

n CrO₃ + H₂O => H₂(CrO₃)_(n-1)CrO₄

With n= 2 for example it will be H₂Cr₂O₇ Dichromic acid.

For what reason you want to dry it. It's a very poisson and cancerogene stuff. Normally it will be dissolved in water or sulfuric acid as etching compound.

Drying  with Phosphorous pentoxide is possible.

7 hours ago, Dennis1590 said:

My question is. What am I missing here.

You missing it's a weak acid.

The dissociation of carbonic acid is not half H2CO3 half HCO3-. This is only valid if you have a buffer of carbonic acid and (sodium) hydrogencarbonate half half. Then pH is pKa according Hendersson Hasselbalch.

pH = 0.5* (pka-logc) for weak acid.

But I don't think it's possible  to get

CO2 => C + O2 by electrolysis. Also with metal catalysts.

Only what exchemist already wrote

The CO2 is converted to other compounds, which are conductive.

1 hour ago, bazzy said:

Hi Everyone

Been A while since i have been on this forum.

I have been looking at a new starship simulator game upcoming and that has got me thinking about oxygen reclamation in a space scenario.

in enclosed spaces like on the ISS they use Lithium Hydroxide to capture and remove co2 while using electrolysis to generate more oxygen. Now I understand that power consumption is an issue with thinking about this, however

If you where to capture and separate the C02 from the air then compress it to a liquid under cryogenic temperatures then as a liquid use electrolysis to break it down to Oxygen and carbon monoxide and oxygen then using Cryogenic Distillation separate the Carbon Monoxide from the Oxygen, then compress the Carbon Monoxide to a liquid and perform the same electrolysis process to separate the Carbon from the oxygen, again using Cryogenic Distillation to separate the remaining Carbon Monoxide from the Oxygen for further processing?

I may be completely missing the mark with the science here but could that work? I do realize this would be an extremely energy intensive process but if energy was in abundance could this process work?

I think he want to electrolyze the liquid carbondioxide  itself. But this is not working because it is not conductive.

Do  know Google?

https://www.google.com/search?client=firefox-b-m&sca_esv=5d0811d5ae0715ef&sxsrf=ACQVn0-p-z-yyFyMDB0X402732ehGEwd5w%3A1713899584052&q=nanotechnology+books+&oq=nanotechnology+books+&aqs=heirloom-srp..0l5

Because there are some more compounds in the battery like ammonium chloride, the practical voltage is 1,5 V

https://www.azom.com/article.aspx?ArticleID=22363

The voltages can be found in electrical potential tables.

5 hours ago, Externet said:

Hello. 

Can someone teach me how a chemical reaction translates into potential differential Volts as a battery ?  These chemical reactions / equations for these elements / compounds :

 

Or as for a perhaps simpler case, the well known carbon-zinc vulgar cell yielding 1.5 volts.

Nernst law

Potontials with positiv voltage minus Potential with more negative voltage gives potential between the two electrodes

Here 1 V -(-0.26 V) = 1.26 V

Zinc -0,763 V  carbon-manganeseoxide +0,975 V

0,975V - (-0,763) = 1,738 V

First what is the volume of your container

Roughly you can calculate you have 3 part H2 and 8 part O2 means together 11 part equal to mol.

Convert Fahrenheit to Kelvin

1058 F = 843,15 K

p = 11 mol*8.314 J/molK* 843,15K/ V m^3

Of course you will not find it to buy. You have to mix both compounds. It will react immediately.

https://www.researchgate.net/figure/Synthesis-of-urea-glyoxal-resin_fig2_359692764

That is a poor explanation.

What is your question?

https://www.quora.com/Is-urea-acidic-or-basic

Beside your link I cannot find any other scientific link, where this is mentioned. Its more opposit, lime evaporate the nitrogen as ammonia, it is lost for the plants.

Quote

carbamide acidifies the soil

Who says that

The miscibility of liquids and the evaporation rate are different things. If you mix the three solvents they will dissolve directly.

The compound of the highest vapor pressure will evaporate faster as the other ones.

On 3/5/2024 at 10:23 PM, MigL said:

But pure Ammonia, by itself, is not basic, just a strong reducer ?

Ammonia is a gas at standard conditions, we cannot speak it has an pH, like water steam has no one.

But liquid ammonia has also its autopotolysis like water it has.

2 NH3 => NH4+ + NH2-

2H2O => H3O+ + OH-

So could have a pH scale based on ammonium theoretical.

Its the opposit

which I reduced an alkane to an alkyne.

You reduce the alkyne to the Alkane.

Why do you think it will not stop.

If it works it will go through, even you have only two equivalent. Then some reactant will be left.

If so why should it stop at acetophenon, this could react to 2 Phenyl-2-propanol. But it doesn't happen. If you use instead of the acid the ester then its possible.

Carbonic acids cannot be treated with Grignard

https://upload.wikimedia.org/wikipedia/commons/thumb/5/53/Grignard_with_carbonyl.png/450px-Grignard_with_carbonyl.png

You can see they also treated CO2 to make carbonic acid. This would be not possible if carbonic acid would under go Grignard.

Normaly its stable if you convert  amines to the amid like acetamid.

https://www.reddit.com/media?url=https%3A%2F%2Fi.redd.it%2F3jehma6dqs2a1.jpg&rdt=60302

Ok  Beside of neutrons, the other make it not radioactive, but it harm in other way as can read here.

https://hps.org/publicinformation/ate/q13412.html