Is My Acid Equilibrium Final Review Correct?

AI Thread Summary
The discussion revolves around a review package containing errors related to acid-base equilibrium problems. Participants identify a typo where HA is mistakenly referred to as HB and debate the sign of ΔG°. One contributor suggests that since the teacher uses double-headed arrows, ΔG should be zero, but another clarifies that ΔG standard is the relevant term. The conversation emphasizes the importance of correctly interpreting equilibrium concepts in relation to the final exam. Overall, the thread highlights the need for clarity in problem statements and understanding thermodynamic principles.
yolo123
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Hello Forum!
I have this review package for my final full of weird mistakes. Problem is that it is hard for me to know if the solutions are right or not:
Could you please look at this problem I attached?

They bizarrely switch from HA to HB. Is that just a typo?

Then, the sign of DG° seems to be wrong! We are looking at the forward reaction, ie it is positive!

I have my final very soon. Any help is appreciated!
 

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Where is HA? I do not see it in your attached picture.
 
I attached two pictures, one is really tiny. Sorry about that.
 
The HA is a typo. The work backs it up. Your teacher means HB.
 
Also what do you think the sign on delta G standard should be and why?
 
yolo123 said:
Hello Forum!
I have this review package for my final full of weird mistakes. Problem is that it is hard for me to know if the solutions are right or not:
Could you please look at this problem I attached?

They bizarrely switch from HA to HB. Is that just a typo?

Then, the sign of DG° seems to be wrong! We are looking at the forward reaction, ie it is positive!

I have my final very soon. Any help is appreciated!
It looks like a typo in the problem statement.

Chet
 
Hmm.. I may have been mistaken. Tell me if I make sense:
So we use Ka (dissociation of HA). Plug that into -RTln(Q)=DG°.
Now, I must reverse the sign because I'm looking at the REVERSE process.
In the end, I get a negative result, which confirms my teacher's answer!
 
I would say that because your teacher uses double headed arrows, he's referring to an equilibrium, and therefore delta G should be 0. But this isn't relevant because your teacher refers to delta G standard.
 
Last edited:
Qube said:
I would say that because your teacher uses double headed arrows, he's referring to an equilibrium, and therefore delta G standard should be 0.
This is not correct. ΔG should be zero, not ΔG standard.

Chet
 
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  • #10
Chestermiller said:
This is not correct. ΔG should be zero, not ΔG standard.

Chet

Good point! I'll fix it.
 
  • #11
So, was my final response right6?
 

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