What characterizes an acid as strong?

  • Thread starter Xishan
  • Start date
  • #1
40
0
I've posted this question in another thread... didn't get the answer though

Why does a strong acid (or a base) ionizes to a higher extent? Is this extent of ionization the only criteria for characterizing an acid (or a base) as strong or weak. Is it the simple bond polarization phenomenon that causes the ionization?
 

Answers and Replies

  • #2
undertow
i'm not a tutor but i would guess its due to bond strength. probably wrong tho
 
  • #3
3,106
4
Does hydrogen bonding have some effect on pH?
 
  • #4
347
1
Its due to the 'regularity' of the acid molecule to dissociate into Oxonium ions. For example, Hydrogen fluride has only something like 10% - 20% of its molecules dissociating into oxonium ions, while a 'strong' acid such as hydrochloric acid will have 90 - 100% dissocition of its molecules into oxonium ions.
 
  • #5
40
0
So, my question stands unanswered! Why does HCl dissociate to such a high extent and while HF to only a little extent???
 
  • #6
347
1
Xishan said:
So, my question stands unanswered! Why does HCl dissociate to such a high extent and while HF to only a little extent???

Its because the H-F Bond is much stronger than the H-Cl bond.

Note: you asked why strong acids IONIZE to a higher extent, and technically, this has been answered.
 
  • #7
It is due primarily to bond strength, and temp...water only has the ability to pull apart some acids, that is one reason why 'sensitive' reactions take place @ lower temps. The acids dissassociate less because the water only has a certain amount of strength to rip them apart in the first place.
 
  • #8
40
0
Bladibla said:
Its due to the 'regularity' of the acid molecule to dissociate into Oxonium ions. For example, Hydrogen fluride has only something like 10% - 20% of its molecules dissociating into oxonium ions, while a 'strong' acid such as hydrochloric acid will have 90 - 100% dissocition of its molecules into oxonium ions.

Hmmm... OK! I admit, Bladibla, you are right. You've answered my question. I actually overlooked the first sentence of your reply. Thanks!

Can someone please name around ten strong acids, strong bases, weak acids and weak bases and give their respective %ionization?
 
  • #9
40
0
I got it myself, not TEN though!

http://www.dbhs.wvusd.k12.ca.us/webdocs/AcidBase/Strong-Weak-AcidBase.html [Broken]
http://www.members.aol.com/profchm/tcjc_ch15.html [Broken]

I'll be back with more questions in future. Inshallah
 
Last edited by a moderator:

Related Threads on What characterizes an acid as strong?

  • Last Post
Replies
3
Views
2K
  • Last Post
Replies
16
Views
5K
  • Last Post
Replies
7
Views
4K
  • Last Post
Replies
6
Views
16K
  • Last Post
Replies
6
Views
76K
Replies
6
Views
8K
  • Last Post
Replies
1
Views
2K
Replies
35
Views
2K
Replies
1
Views
2K
Replies
1
Views
7K
Top