Acid and Base Strength

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Jada Brown 2H
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Joined: Sat Aug 17, 2019 12:15 am

Acid and Base Strength

Postby Jada Brown 2H » Sun Nov 24, 2019 11:29 am

How can you tell is something a strong acid vs. a weak acid? What about strong bases vs. weak bases?

SnehinRajkumar1L
Posts: 101
Joined: Thu Jul 11, 2019 12:15 am

Re: Acid and Base Strength

Postby SnehinRajkumar1L » Sun Nov 24, 2019 11:40 am

Strong acids and bases completely dissociates in water. Additionally, Ka and Kb (their respective equilibrium constants) will be really high because of this complete dissociation.

Deepika Reddy 1A
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Joined: Thu Jul 11, 2019 12:15 am

Re: Acid and Base Strength

Postby Deepika Reddy 1A » Sun Nov 24, 2019 11:42 am

A strong acid and base reaction will have equilibrium lie far to the right because they both dissociate almost completely into products. This means that at the end of the reaction, there will be more products than reactants. A weak acid and base will have equilibrium lie far to the left and at the end of the reaction there will be more reactants than products.

Joanne Lee 1J
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Joined: Thu Jul 25, 2019 12:15 am

Re: Acid and Base Strength

Postby Joanne Lee 1J » Tue Nov 26, 2019 5:15 pm

Strong acids and bases will completely dissociate in water whereas weak bases and acids only partially dissociate in water. However, it might be easier to just memorize strong acids and bases in order to identify between the two.

Camellia Liu 1J
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Joined: Sat Aug 24, 2019 12:15 am

Re: Acid and Base Strength

Postby Camellia Liu 1J » Wed Nov 27, 2019 11:37 am

I believe a hint given in lecture too is that if you are given a Ka or a Kb in a question, you will automatically know that it is a weak acid or base since it shows that the substance does not dissociate completely.

Justin Sarquiz 2F
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Joined: Fri Aug 30, 2019 12:15 am

Re: Acid and Base Strength

Postby Justin Sarquiz 2F » Wed Nov 27, 2019 11:40 am

I am not sure about bases, but for acids the longer the bond length, the stronger the acid because it is easier to lose an H+. Therefore, the larger the atom, the longer the bond length, the stronger the acid.

Vicki Liu 2L
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Joined: Sat Aug 24, 2019 12:15 am

Re: Acid and Base Strength

Postby Vicki Liu 2L » Wed Nov 27, 2019 11:45 am

Another indication of acid strength is how stable the resulting anion is. This can be determined by examining the electron pulling ability of the anion involved. From the example given in class, HClO is a stronger acid than HBrO, as the higher electronegativity of Cl stabilizes the negatively charged O by withdrawing electron density.

alexfwang3g
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Joined: Thu Jul 11, 2019 12:16 am

Re: Acid and Base Strength

Postby alexfwang3g » Wed Nov 27, 2019 12:13 pm

Strong acids fully dissociate in solution, same with strong acids. As for specific acids, they're usually HCl, H2SO4, HI, HNO3, HBr, HClO4. Strong bases are usually hydroxide paired with cations from the first two groups.


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