Final : Question about Neutral or Ionized acid

Science questions not covered in Chem 14A and 14B. Try to limit questions to chemistry (inorganic chemistry, physical chemistry, organic chemistry, biophysical chemistry, biochemistry, materials science, environmental chemistry).

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Rida Ismail 2E
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Joined: Sat Sep 07, 2019 12:16 am

Final : Question about Neutral or Ionized acid

Postby Rida Ismail 2E » Sun Dec 08, 2019 8:06 pm

Does anyone understand how to do the problem where it asked if the structure was in the Neutral for Ionized form due to the pH and the Ka values on the final?

Karyn How 1J
Posts: 50
Joined: Thu Jul 25, 2019 12:16 am

Re: Final : Question about Neutral or Ionized acid

Postby Karyn How 1J » Sun Dec 08, 2019 8:08 pm

For that question, you would compare the pH to the pKa of the acid to determine whether the reaction was favored more towards the neutral or ionized form. In this case, the pKa was higher than the pH indicating that the acid was found more in the neutral form.

Gerald Bernal1I
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Re: Final : Question about Neutral or Ionized acid

Postby Gerald Bernal1I » Sun Dec 08, 2019 9:00 pm

Another way to check if it was ionized was to use the ph value and from that plug it in to the Ka equation. pH just refers to the H+ concentration and therefore you would know the value of H+ and A- and would be able to solve for the HA value which ended up being larger than the other concentrations.

Natalie Wang 1B
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Re: Final : Question about Neutral or Ionized acid

Postby Natalie Wang 1B » Sun Dec 08, 2019 10:52 pm

Another way to think about it is that in the pH of 2, there are a lot of H+ ions. In equilibrium reactions, which is what happens when weak acids disassociate, an equilibrium must be maintained. Since there are a lot of H+ ions, this would cause the reaction to favor the opposite end of the acid disassociation reaction, so it would favor HA over H+ + A-. That is another reason for why HA would be neutral.


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