Weak Acids / Strong Acids

Moderators: Chem_Mod, Chem_Admin

Kathleen Vidanes 1E
Posts: 62
Joined: Fri Sep 29, 2017 7:07 am

Weak Acids / Strong Acids

Postby Kathleen Vidanes 1E » Sun Dec 03, 2017 10:41 pm

How do you determine whether a certain acid or base is considered weak or strong?

CameronJohari1J
Posts: 66
Joined: Fri Sep 29, 2017 7:06 am
Been upvoted: 1 time

Re: Weak Acids / Strong Acids

Postby CameronJohari1J » Sun Dec 03, 2017 10:52 pm

The following are strong acids:
HCl
HNO3
HBr
HI
H2SO4
HClO4
All other acids are considered weak.

The following are strong bases:
All group 1 metal hydroxides
LiOH
NaOH
KOH
RboH
CsOH
Some of the heavier group 2 metal hydroxides
Ca(OH)2
Sr(OH)2
Ba(OH)2
All other bases are considered weak.

Nicole Nikolov 1K
Posts: 50
Joined: Fri Sep 29, 2017 7:05 am

Re: Weak Acids / Strong Acids

Postby Nicole Nikolov 1K » Sun Dec 03, 2017 10:52 pm

It turns out that most acids and bases are weak, so not that many acids and bases are strong. The best way to go about it would be to memorize all of the strong acids and bases and just to assume that the others are weak.

Sabah Islam 1G
Posts: 50
Joined: Sat Jul 22, 2017 3:01 am

Re: Weak Acids / Strong Acids

Postby Sabah Islam 1G » Sun Dec 03, 2017 10:55 pm

You determine whether a certain acid or base is considered weak or strong by looking looking at its dissociation properties. If the acid deprotonates (dissociate) completely in water, it is a strong acid and if it deprotonates incompletely, it is a weak acid. For a strong acid, the Ka is much higher that that of a weak acid. If a base protonates (OH- is formed) completely in water, then it is a strong base and if it does not protonate completely, then it is a weak base.

mendozayael_2H
Posts: 31
Joined: Fri Sep 29, 2017 7:06 am

Re: Weak Acids / Strong Acids

Postby mendozayael_2H » Sun Dec 03, 2017 11:01 pm

Strong acids will usually be at or close to 100% complete ionization and can donate more protons than a weak one because the strong acids lose more hydrogen atoms. Bases are similar in that strong bases will disassociate (will ionize) better than weak ones. pH will tell you where the acid/base stands: low pH means strong acid & weak base, vice versa for high pH.

Abigail Urbina 1K
Posts: 102
Joined: Thu Jul 27, 2017 3:01 am

Re: Weak Acids / Strong Acids

Postby Abigail Urbina 1K » Sun Dec 03, 2017 11:16 pm

The easier it is for the acid to dissociate, the stronger of an acid it is. Keep in mind that single arrows are used in chemical reactions for strong acids to denote that it is being COMPLETELY ionized when it is in water. Stronger acids can donate more protons in comparison to weak acids because they have more protons to donate considering how much easier it is for them to lose protons.


Return to “Properties & Structures of Inorganic & Organic Acids”

Who is online

Users browsing this forum: No registered users and 1 guest