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Tricks for identifying Strong/Weak Acids & Bases

Posted: Thu Jan 24, 2019 4:05 pm
by Lauren Ho 2E
Does anyone know of any tips or tricks that will allow you immediately to identify an acid or base as weak or strong?

Re: Tricks for identifying Strong/Weak Acids & Bases

Posted: Thu Jan 24, 2019 4:10 pm
by Kate Chow 4H
If you know Ka or Kb, you can determine the strength of an acid or base. But if you don't, there's a short list that you can memorize or know pretty well. For example, most all of the strong bases use the elements in the first 2 columns of the periodic table.

Re: Tricks for identifying Strong/Weak Acids & Bases

Posted: Thu Jan 24, 2019 4:20 pm
by mbaker4E
These are some general strong acids/bases I memorized:
Strong Acids - HCl, HBr, HI, HNO3, HClO3, HClO4, H2SO4
Strong Bases - LiOH, NaOH, KOH, RbOH, CsOH, Ca(OH)2, Ba(OH)2, Sr(OH)2

Re: Tricks for identifying Strong/Weak Acids & Bases

Posted: Thu Jan 24, 2019 4:21 pm
by Casandra
Lauren Ho 2E wrote:Does anyone know of any tips or tricks that will allow you immediately to identify an acid or base as weak or strong?

For strong bases and strong acids, it would help to memorize the list of strong acids and bases, because then you know anything that is not a strong base or acid, has to be weak. Also side note, for the most part any base that does not gave OH is weak

Re: Tricks for identifying Strong/Weak Acids & Bases

Posted: Thu Jan 24, 2019 4:44 pm
by Sarah_Kang_2K
For Test 1, what should we know about the pH of weak acids and weak bases and its salt? We didn't go over this in discussion. Do we just need to know how to calculate it?

Re: Tricks for identifying Strong/Weak Acids & Bases

Posted: Thu Jan 24, 2019 4:45 pm
by Ethan Baurle 1A
Anytime we are given a Ka or Kb, the acid or base is almost certainly going to be weak. This is because the Ka or Kb of a strong acid or base is extremely high because the substance gets basically completely deprotonated/protonated. This should help you in identifying weak substances right away, and then you can either memorize strong ones or the problem may indicate it is a strong substance in some way.