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Final : Question about Neutral or Ionized acid

Posted: Sun Dec 08, 2019 8:06 pm
by Rida Ismail 2E
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?

Re: Final : Question about Neutral or Ionized acid

Posted: Sun Dec 08, 2019 8:08 pm
by Karyn How 1J
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.

Re: Final : Question about Neutral or Ionized acid

Posted: Sun Dec 08, 2019 9:00 pm
by Gerald Bernal1I
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.

Re: Final : Question about Neutral or Ionized acid

Posted: Sun Dec 08, 2019 10:52 pm
by Natalie Wang 1B
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.