AP Chemistry 2024 Free Response Question #1 – SOLVED!

In this video, Mr. Krug walks through AP Chemistry 2024 free-response question 1, which was posted for public view by the College Board on May 8, 2024. This was a long question, worth a total of 10 points.
As a reminder, the College Board’s official key will NOT be posted online until mid-summer 2024. Also, Mr. Krug does not work for College Board, so his proposed answers and point breakdown are just that – proposed answers. College Board is often more lenient, or more strict, than Mr. Krug’s answers, and Mr. Krug can’t say exactly which answers or which wording will or won’t be accepted as correct.

00:00 Introduction
01:05 Part A
01:27 Part B
02:22 Part C
03:17 Part D
07:00 Part E

Important Links
Ultimate Review Packet for AP Chemistry
Mr. Krug’s Full AP Chemistry Course Online
AP Chemistry Review Strategies

[Yuccbj]

I know I shouldn't have, but I still clicked into this video

[Nangoless]

Thank you Mr Krug, I know I most definitely know I got a 1 now

[horatio]

watching this made me realize every mistake i made i'm pretty sure i only got 2 points on this 💀, but i still get DE creds so it's okay

[cherrycola]

Mr. Krug, thank you for guiding us throughout this whole year for AP chem!! I'm excited and scared to see how well I did on the frqs....

[sciencefair]

Hi Mr. Krug, I want to thank you so much for helping us with all of these videos! I kept hearing your voice while I was taking the exam guiding me through :) your videos have really helped me a lot, and I thank you for that! I hope your channel grows even more to help future ap chem students!

[imadeanaccountjusttodothis]

Will you do the others soon? I did poorly here but I think I may have done better on the others. Titration curves have always been my weakest point and I got very unlucky at how prominent they were on here

[JamesK-xfvw]

Hi Mr. Krug, for the part where it asks you to draw the X on the titration curve, I didn't use the pH formula. Instead, I used the ratio of the mL of NAOH added and the number of titrated lactic acid molecules. So, because at 8 mL NAOH there should be 3 titrated particles, then the ratio is (8/3), and so to figure out the point where X particles have been titrated, you use (8x/3). So for example, at the point where all 6 acid particles are titrated, you do (8 * 6) / 3 = 16 mL NAOH, which seems correct (16mL is the point where all 6 acid particles are titrated). So therefore, to find out the point where 2 acid particles are titrated, you do (8 * 2) / 3 = 5.33 mL NAOH. This is where I drew the X. And it does appear that at x = 5.33mL the pH value is basically 3.6, so it seems correct. Would I get credit for this ?

[chris-ibml]

Mr krug! Thank you for all the help you provided this year!!! You single-handedly made this class enjoyable!

[ezrasteiny]

so excited to watch this!! Thanks Mr krug for all your help and my prep for the exam! I think I did pretty well maybe a 5!

[blastro]

Def 5. Only got like 3 wrong on all FRQs and felt very good on MCQ. Thank you Mr. Krug for clutching up all year!

[jujusax]

Thank you so much for helping me prepare for the exam. your videos were super helpful!!!

[anniejohnson]

okay this frq was so hard but i didn't do as bad as i thought so that's good. thanks mr. krug!!

[AdiR]

For D, if I simply said acid concentration was greater than salt, therefore its before half equivalence point, would that work?

[fpwot]

If I said 4 would I get the point? For the half way point? For the PkA

[hak.eber]

I think I got all the questions on FRQ right. I just finished watching your videos and got the same answers. But I’m a little worried cause for the pKa question, I put the answer as 4 not 3.9 and I don’t think I followed the beginning part of the modified titration curve as closely as you did. I put the x around the same spot, but I didn’t make any calculations. I just saw the conjugate less than the original… do you think they’ll dock points for this?

[yushisetlur]

Hi Mr. Krug. For the X part, it didn’t say support with calculations so i just explained that before the the pKa, there would exist more HA than A- which is before the pKa, then put my X somewhere behind the pKa. Would this be correct? Additionally I out the approximate pKa as 4, would this be ok.

[JessicaClendenon]

Just curious why the answer to (e) is not -2700 Joules since it is an exothermic reaction.

[rndmprsn]

What if for question e) i) I put a negative value because it wss exothermic?

[A-xc]

Do you know about the questions for the international test?

[loaid]

Mr Krug will they ever release the other FRQ? I got form E and I don’t think it will ever be released.