17.2 Acid-Base Titrations and Titration Curves | General Chemistry

Chad provides an introduction to titrations and titration curves. The lesson begins with a description of a Strong Acid / Strong Base titration curve. The terms analyte, titrant, equivalence point, and indicator are all introduced and defined. It is explained how a the titration of a strong acid with a strong base produces water and a neutral salt explaining why the pH is equal to 7 at the equivalence point. An example calculation of the concentration of the analyte from the equivalence point is performed.
Next, a description of a Weak Acid / Strong Base titration is provided including the fact that the pH is greater than 7 at the equivalence point as the products are water and a basic salt. Also described is the half-equivalence point where half the amount of titrant required to reach the equivalence point has been added. At this point the concentration of the conjugate acid is equal to that of the conjugate base. According to the Henderson-Hasselbalch equation, pH = pKa and pOH = pKb and this point in the titration can be used to quickly approximate the pKa of a weak acid or the pKb of a weak base.
Finally, a description of a Weak Base / Strong Acid titration is provided including the fact that the pH is less than 7 at the equivalence point as the products are water and an acidic salt. Just as in the Weak Acid / Strong Base titration, the half-equivalence point can be used to quickly approximate the pKa of a weak acid or the pKb of a weak base.
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00:00 Lesson Introduction
00:59 Strong Acid-Strong Base Titration Curve
11:53 Weak Acid-Strong Base Titration Curve
23:16 Weak Base-Strong Acid Titration Curve
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[@divital]

i love you so much chad! i don't know how you get this much motivation to teach such a complex subject with this ease! greatest chemistry teacher of all time

[@ChadsPrep]

Thanks Divital! And I hope I'm still getting better every day. But I also know who I consider the greatest chemistry teacher of all time and I am definitely not at his level. Unfortunately, he is not on youtube, but Dr. George Wolf teaches quantum mechanics like nobody else!👍

[@rekhashetty9911]

@@ChadsPrep Hi Possible to provide his website address? I will look into his profile and listen to his talks if possible.

[@V3V0.2M]

you have made my chem lecture slides even more useless than they were thank you so much for all your videos. if i knew where u lived i would buy u chocolate & wine and a newtons cradle or something idk but ur the best dude

[@ChadsPrep]

Thanks, Jakobson - glad the videos are helpful!

[@penelopebeekman9826]

this comment is so real

[@V3V0.2M]

@@penelopebeekman9826 yessss because the channel is real a real cheat code

[@TheUltimateSayain]

Thank you so much, this is extremely helpful. Quick question, at the half-equivalence point of each of the last two titration curves, is the region of plus or minus 1 around this point the buffering region?

[@VelkozSupport]

Just wanted to thank you. I wanted to review this part of solution chemistry and you nailed it.

[@ChadsPrep]

You're welcome!

[@dunchollingsworth8004]

Your videos are great and I really admire the way you make science coherent. Also, I love your shirt!

[@ChadsPrep]

Thanks x3 - Happy Studying!

[@venugopalmiyyapuram4890]

Excellent lecture Chad - so easy to understand. You are an awesome teacher.

[@ChadsPrep]

Glad it was helpful!

[@danielkim4151]

You made the explanation so clear!!!! Really helped me understand acid base titrations :))

[@ChadsPrep]

Excellent - glad to hear it!

[@balajikannan78]

Thanks, very patiently and thoroughly explained.

[@ChadsPrep]

You're welcome!

[@tranphu2330]

Basically spent my whole spring beak with you. These videos are extremely helpful! I used to dread doing chem but learning chem from you makes it exciting to solve problems, thank you so much!! If you could, can you pleasee go over titration(curve) of polyprotic acids?

[@heisenberg2602]

Lmao me 2! Also got the same request.

[@AmitMusicStaz]

Chad you''re amazing! best teacher ever!

[@ChadsPrep]

Thank you very much!

[@shavoniilloyd7825]

wow i really love ur videos, it gets down to the small details. love it

[@ChadsPrep]

Glad you do!

[@dom6783]

This is going to help so many students

[@ChadsPrep]

Glad to hear it Dom :)

[@harry-uh4yg]

Thank you so much ❤️💕 I enjoyed this lecture..

[@ChadsPrep]

You are very welcome, harry!

[@ilanbocian1291]

Thank you for this! Do you by any chance have a video for the titration of polyprotic acids and bases, please?

[@ChadsPrep]

You are welcome and check the last chapter (15:20 onwards) of this one: kzbin.info/www/bejne/oYTJpGONmtN_jtE

[@saqibkhan3364]

Around 23:00, you say that the moles of Acid and Conjugate Base are equal, but is it more accurate to say that the Molarity of the Acid and its Conjugate base are equal at the equivalence point? Is it true that at the half equivalence point, the concentration and moles of Acid and Conjugate base are equal? Or can the concentration of the Acid and Base be different from the moles of Acid and Conjugate Base? I hope my questions make sense.

[@heshaanprathapan1232]

I mean you can approach it either way since we are dealing with the same volume, Since there is no change in volume the moles won't be altered unless we will get a different value for the molarity. I hope it helps

[@pchacks4u300]

Im kinda stuck with the Equivalance point part. On the graph, it shows you have to ad 20mL of NaOH. But when you were describing the 1/2 equivalnce point, in the initial equation you wrote 10 mol HF+ 10 mol NaOH. Can you clarify that part?

[@pchacks4u300]

Oh no whatever I get it lol, there is also a reactant side. My smart rear-end 🙅

[@divital]

by the way do you ever revise stuff before ? this was just flawless...

[@ChadsPrep]

Hello Divital! There is definitely some editing that goes on behind the scenes and every once in a while I am unhappy with a video after editing it and will go and refilm the whole thing (it happened with this lesson, but it's the first one in this whole playlist). Glad you found it helpful!

[@sumairaimaan8377]

Sir when we are performing titration of strong acid with a strong base.....light pink color indicates equivalence point or end point ?? As phenolphthalein gives pink color in basic medium and colorless in acidic medium .....so light pink color would be in neutral medium ?

[@ChadsPrep]

Hey! Phenolphthalein noticeably changes colour between pH 8-10 so this is slightly past the equivalence point. It would be light pink from about 8.3-9 pH

[@sumairaimaan8377]

@@ChadsPrep thank you Sir for your kind response....this is helpful.

[@ChadsPrep]

@@sumairaimaan8377 👍👍👍

[@esthertok9804]

Thank you so much!!!

[@ChadsPrep]

You are very welcome.

[@RelaxRailRide]

Nice sir. Good night I will watch on tomorrow morning.

[@ChadsPrep]

Excellent - hope you enjoy!

[@jbecuti]

about to have my final exam for gen II chem, I'll let you know if I cooked or got cooked

[@naveengrover._.]

Thanks

[@ChadsPrep]

You're welcome

[@TheRooflesstoofless]

“Cool” 😎

[@ChadsPrep]

Thanks!

[@moonlight-cj2cv]

15:30

[@ChadsPrep]

ok

[@moonlight-cj2cv]

@@ChadsPrep haha😂 I just wrote the time because I wanted to go back to watch it later..!! Thanks for making helpful videos for students.. I really appreciate your effort!☺️

[@ChadsPrep]

@@moonlight-cj2cv You're welcome - thank you!

[@Bulayla1426]

For my gen chem 1 online class The professor would read stuff from the textbook and the audio he posted were horrible quality Like clockwork i watched the first half of this series and alhamdulilah i got a 90 on my final and A overall Thank you prof chad 🫡

[@ChadsPrep]

You're welcome - glad the channel/videos are helping!