Asked by Christine

You have the following acids and their conjugate bases available:
Acetic Acid: CH 3COOH/CH3COO-; Ka = 1.8 × 10-5
Carbonic Acid: H2CO3/HCO3-; Ka = 4.2 × 10-7
Hydrofluoric acid: HF/F-; Ka = 7.2 × 10-4
Which of these acid/conjugate base pairs would be the best choice for a buffer in the range of pH 4.5?

a. acetic acid
b. carbonic acid
c. hydrofluoric acid

I believe B. Please help.
Answered by Christine
i think the answer is A because it's pKa is the closest to pH 4.5.
Answered by DrBob222
B is wrong. A is right. Typically you want to pick pKa withing +/- 1 of the desired pH.
Answered by Jameson
Christine! Are you doing AP Chem with k12?
Answered by Drbob hater
LETS GOOOOOOOOOOOOOOOOOOOOO. 20 MORE QUESTIONS
Answered by Blicky
I love all of you man. This was my last question for AP chem! I will never have to take AP chem again HAHAH. THANK YOU ALL FOR THE AMAZING HELP!!!
Answered by Leo
Finally finished this course too
There are no AI answers yet. The ability to request AI answers is coming soon!