Ranking strong acids and bases

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inlovewithchemistry
Posts: 104
Joined: Fri Sep 28, 2018 12:19 am

Ranking strong acids and bases

Postby inlovewithchemistry » Fri Dec 07, 2018 12:16 pm

How would you go about ranking which strong acid is stronger or which strong base is stronger? For example, how would you compare HI and HClO4 or Ca(OH)2 and KOH?

Daniel Lai
Posts: 65
Joined: Fri Sep 28, 2018 12:28 am

Re: Ranking strong acids and bases

Postby Daniel Lai » Fri Dec 07, 2018 12:47 pm

I think greater polarity in the bond means they are more likely to dissociate.

105085381
Posts: 44
Joined: Fri Sep 28, 2018 12:15 am

Re: Ranking strong acids and bases

Postby 105085381 » Fri Dec 07, 2018 3:12 pm

Can someone further explain how to rank strong acids versus bases?

Sarah_Kang_2K
Posts: 72
Joined: Fri Sep 28, 2018 12:23 am

Re: Ranking strong acids and bases

Postby Sarah_Kang_2K » Fri Dec 07, 2018 3:48 pm

For binary acids,
the more polar the H-A bond/the greater the electronegativity of A, the stronger the acid H-A
the weaker the H-A bond, the stronger the acid

For oxoacids,
the greater the electronegativity of the central atom, the stronger the oxoacid
the greater the # of oxygen atoms attached to the central atom, the stronger the oxoacid (given that the central atom is the same)

for carboxylic acids,
the greater the electronegativities of the groups attached to the carboxyl group, the stronger the acid.

I'm not sure how to go about ranking strengths of bases???

Ivan Tadeja 4B
Posts: 31
Joined: Fri Sep 28, 2018 12:28 am

Re: Ranking strong acids and bases

Postby Ivan Tadeja 4B » Fri Dec 07, 2018 8:04 pm

Polarity and electronegativity are the easiest way to determine strength. Strength of acidity is based upon its ability to lose a proton. Strong acids dissociate completely in water while weak acids only dissolve partially.


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