Weak vs strong acids  [ENDORSED]

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Faisal Alshamaa - 1L
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Joined: Fri Apr 06, 2018 11:01 am

Weak vs strong acids

Postby Faisal Alshamaa - 1L » Tue Jun 05, 2018 9:53 pm

So I understand the difference between what makes a strong acid (the fact that it fully becomes deprotonated) vs a weak acid (not fully deprotonated). However, I don't understand how we can conclude this from looking at an equation because that will always shows us that it becomes fully deprotonated. Are we going to be told if its fully ionized or not?

octaviahuang1f
Posts: 30
Joined: Fri Apr 06, 2018 11:03 am

Re: Weak vs strong acids

Postby octaviahuang1f » Wed Jun 06, 2018 2:43 am

I think a way to tell weak acids from strong acids is by the bond strength. If the bond is weaker, it would be easier for the acid to donate the H+. The bond would also be easier to break if the resulting anion is stabler.
You can also identify a weak acid if it's in the carboxyl group (Edit: organic acids are generally weaker).
Hope this helps! :)
Last edited by octaviahuang1f on Wed Jun 06, 2018 2:54 pm, edited 2 times in total.

Ismail 1F
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Joined: Wed Nov 15, 2017 3:02 am

Re: Weak vs strong acids

Postby Ismail 1F » Wed Jun 06, 2018 12:00 pm

Depending on the type of group it has attached, you can tell whether it is acidic or basic, as well as the number of hydrogens a formula has.

Harmonie Ahuna-1C
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Joined: Fri Apr 06, 2018 11:01 am

Re: Weak vs strong acids

Postby Harmonie Ahuna-1C » Thu Jun 07, 2018 12:44 am

In the textbook it talks about how organic acids are weaker than acetic acids so depending on the compound, you can try to deduce strength based off of chemical formula. The formula for organic acids is COOH, and acetic acids are CH3COOH.

kellyz_1C
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Joined: Fri Apr 06, 2018 11:05 am

Re: Weak vs strong acids  [ENDORSED]

Postby kellyz_1C » Thu Jun 07, 2018 8:55 pm

There are 7 strong acids that we should know and all others can be considered weak acids.
strong acids: HCl, HI, HBr, H2SO4, HN03, HClO3, HCl04

Paywand Baghal
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Joined: Fri Apr 06, 2018 11:01 am

Re: Weak vs strong acids

Postby Paywand Baghal » Fri Jun 08, 2018 2:11 pm

kellyz_1C wrote:There are 7 strong acids that we should know and all others can be considered weak acids.
strong acids: HCl, HI, HBr, H2SO4, HN03, HClO3, HCl04


what are we supposed to do with this information about strong acids? is there a specific type of problem that needs this concept of strong or weak acids?

Vienna Cimetta 1L
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Joined: Thu Feb 01, 2018 3:01 am

Re: Weak vs strong acids

Postby Vienna Cimetta 1L » Sun Jun 10, 2018 3:19 pm

Regarding what we need to know about the strong acids I think it's important to be able to say which are stronger than others. This would include using the bond length (longer = weaker, more likely to give off H+) and whether the anion is more stable (more electronegative atoms pull electrons in and cause more dissociation and the ion is more stable).

Shione Nakahara 1F
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Joined: Fri Apr 06, 2018 11:04 am

Re: Weak vs strong acids

Postby Shione Nakahara 1F » Sun Jun 10, 2018 9:19 pm

The strength of an acid determines its ability or tendency to lose a H+. A strong acid completes ionizes in a solution while a weak acid only partially dissociates. Stronger acids have a smaller pKa.


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