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Bounty Hunter
Bounty Hunter
2:04 AM
2
Q: What are the degrees of freedom that define the temperature of an ionic solid (such as sodium azide)?

Karsten TheisDegrees of freedom describe the different ways atoms move in a sample. For a pure ideal gas made of non-linear molecules, there are 3N degrees of freedom (N is the number of atoms in the molecule), 3N-6 of which are vibrational, 3 rotational and 3 translational. So per atom, we have three degrees...

temperature
 
 
9 hours later…
Hot nitric acid (HNQ)
Hot nitric acid (HNQ)
11:29 AM
1
Q: Does CO2 form carbonic acid in the atmosphere?

Stevan WhiteSince when $\ce{CO2}$ goes into water it makes carbonic acid, then what happens when it rains? Some of the $\ce{CO2}$ in the air joins the rain drop as it falls and while the rain drop falls and changes shape, it releases then regains $\ce{CO2}$? Is there a critical point or point of saturation w...

physical-chemistry
 
 
3 hours later…
Math Geek
Math Geek
2:48 PM
Why HClO4 is stronger acid than H2SO4 in acetic acid?

ClO4- is having 4 Resonance structure
Whereas (SO4)2- is having 6 reso structure

So H2SO4 's conjugate base is more stable.hence H2SO4 must have be acidic.
bUT it's not so.

I understand Cl- IS more electronegative than O-.But i think Resonance stablization must play greater role than electronegativity.
Why HNO3 is less acidic than HCl in acetic acid? NO3- is having 3 resonating structures. Still HNO3- is less acidic.Also electronegativity of Cl and N is almost same. Please explain where am i wrong ?
 
Secret
Secret
H2SO4 is a dibasic acid, meaning that its two hydrogens have very different acidity
The conjugate base of H2SO4 is HSO4-
And this has only 2 resonance structures. Not only that, more negative charges are at the oxygen atoms, thus charge is less delocalised here
In contrast ClO4- has 4 resonance structures, with the negative charge at the oxygen, thus heuristically speaking, ClO4- is more stable
Generally, resonance effects are more powerful than inductive effects
 
Math Geek
Math Geek
3:06 PM
Why HNO3 is less acidic than HCl in acetic acid? NO3- is having 3 resonating structures. Still HNO3- is less acidic.Also electronegativity of Cl and N is almost same. Please explain where am i wrong ? @Secret
2
 
Avnish Kabaj
Avnish Kabaj
3:35 PM
^ Delete
There are two more new tags
Without a meta discussion
https://chemistry.stackexchange.com/questions/tagged/synthetic-chemistry
 
Loong
Loong
3:50 PM
@AvnishKabaj I have merged synthetic-chemistry into synthesis.
 
Math Geek
Math Geek
4:05 PM
Forgive me if i'm spamming this chat
0
Q: Explain this Acidic Strength order H2SO4>HCl>HNO3 in acetic acid?

Math GeekExplain this Acidic Strength order H2SO4>HCl>HNO3 in acetic acid ? My Attempt Stability of Conjugate base is proportional to the acidic strength of Acids in acetic acid. 1)SO4- is having 2 Resonance Structures 2)NO3- is having 3 Resonance Structures. 3)Cl- is stable due to octet formatio...

inorganic-chemistry acid-base resonance
 
Secret
Secret
4:18 PM
This question is suprisingly nontrivial, and I am surprised why nobody have been noticing this gap in 1st year teaching. I have bumped this up into the chemical education context to hopefully give a more complete answer
0
Q: acid strength: Periodic trends vs delocalisation, which one is more important

SecretIn 1st year chemistry questions, the concept of acid strength is often introduced to students including the 3 factors that provide a heuristic explanation for most of the common acids and conjugate bases: Electronegativity of the atom directly attached to the protic hydrogen, resonance stabilisat...

inorganic-chemistry acid-base chemical-education
 
 
3 hours later…
M.A.R.
M.A.R.
7:13 PM
0
Q: Eternal Damnation

Damned2HellI'd like to see a discussion area related to the topics of hell, unforgiveness, the unpardonable sin, and related discussion. I'm an expert in the area, I'd be happy to answer questions.

culture life
@Secret That'd be a great post if you self-answer it
I'm not sure others will; things like this that require some effort need a nudge
 
Mithoron
Mithoron
8:08 PM
Two M.A.R.s :D
 
M.A.R.
M.A.R.
@Mithoron I promise I won't bark
 
Mithoron
Mithoron
Hehe
@Secret Nobody noticing? There was much too many similar questions. Thing is you yourself are vastly underestimating the issue. Your question is better then this preceding one, but I don't think you have the info to answer it as the premise is moot.
Neither is "more important". And there are various other effects influencing acidity, which earlier talk about acidity in CH3COOH should instantly bring out...
 
M.A.R.
M.A.R.
8:37 PM
@Mithoron I read that as in "there are no canonicals"
I do think there's enough meat for one but my experience is not many people think so thoroughly about vague and gross preliminary overgeneralizations.
It's shrugged off as no longer important as soon as the exam is over. It's exam material for most people that doesn't even come back to haunt them later
If it was misunderstanding an SN1, that would have been different
 

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