Strong Acids/Bases vs. Weak Acids/Bases

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Delaney Smith 1C
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Strong Acids/Bases vs. Weak Acids/Bases

Postby Delaney Smith 1C » Sun Jan 19, 2020 4:24 pm

How do you know in a problem whether the acid/base is strong or weak? Do you memorize them or is there an easier way to tell?

rabiasumar2E
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Re: Strong Acids/Bases vs. Weak Acids/Bases

Postby rabiasumar2E » Sun Jan 19, 2020 4:40 pm

Strong acids and bases dissociate completely whereas weak acids and bases do not. I would just memorize the strong acids/bases to make working out problems a little easier. There is a list of both in the textbook.

Kristina Rizo 2K
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Re: Strong Acids/Bases vs. Weak Acids/Bases

Postby Kristina Rizo 2K » Sun Jan 19, 2020 4:41 pm

I remember in 14A we were given a table from the book and I found it best to just memorize that table.

Kristina Rizo 2K
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Re: Strong Acids/Bases vs. Weak Acids/Bases

Postby Kristina Rizo 2K » Sun Jan 19, 2020 4:42 pm

Kristina Rizo 2K wrote:I remember in 14A we were given a table from the book and I found it best to just memorize that table.

I would look at pg F75 in the 7th edition book for table J.1

Catherine Daye 1L
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Re: Strong Acids/Bases vs. Weak Acids/Bases

Postby Catherine Daye 1L » Sun Jan 19, 2020 4:47 pm

You have to memorize the strong acids and bases. If the compound is not one of the memorized acids/bases, we assume they’re weak. In general, strong acids start with H and strong bases end with OH. Aside from that, there are a few obscure ones you should memorize.

Viviana Velasquez
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Re: Strong Acids/Bases vs. Weak Acids/Bases

Postby Viviana Velasquez » Sun Jan 19, 2020 6:47 pm

In 14A we had to memorize a list from the textbook, so I'm assuming you just have to refresh your memory on those for this course

Christine Honda 2I
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Re: Strong Acids/Bases vs. Weak Acids/Bases

Postby Christine Honda 2I » Sun Jan 19, 2020 6:55 pm

In discussion, my TA mentioned these as strong acids and bases! I think they would be helpful to memorize so that you know which acids or bases completely dissociate.
Strong Acids: HCl, HNO3, H2SO4, HBr, HI, HClO4
Strong Bases: LiOH, NaOH, KOH, Ca(OH)2, Ba(OH)2, Sr(OH)2

Daria MacAuslan 1H
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Re: Strong Acids/Bases vs. Weak Acids/Bases

Postby Daria MacAuslan 1H » Sun Jan 19, 2020 7:04 pm

From Chemistry 14A, we were advised to simply memorize the list of strong acids and bases. There is a comprehensive list in the textbook. Contextually speaking, though, strong acids and bases are basically the ones that dissociate completely in reactions, while weak ones are the ones that only partially dissociate.

preyasikumar_2L
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Re: Strong Acids/Bases vs. Weak Acids/Bases

Postby preyasikumar_2L » Sun Jan 19, 2020 7:55 pm

Strong acids and bases completely dissociate in water, while weak acids and bases only partially dissociate. There's a fairly small/easy to learn list of strong acids and bases that you can memorize (that was provided to us last quarter or you can just find online). You'll know if something is a weak acid/base if it's not something from that list!

gconcha
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Re: Strong Acids/Bases vs. Weak Acids/Bases

Postby gconcha » Sun Jan 19, 2020 8:01 pm

In general, the simpler compounds directly containing an H or an OH that can be easily dissociated are the ones that you should be looking at. But if you'd like me to be more specific . . .
THE TABLE THAT YOU NEED TO MEMORIZE

pg F75, TABLE J.1 ("Common Aqueous Strong Acids and Bases")
Note that in this table, the Strong Bases indicated are as follows:
LiOH
NaOH
KOH
RbOH
Ca(OH)2
Sr(OH)2
Ba(OH)2


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