17.1 Buffers

[@codygruberg7294]

I agree, teaching method here is clean because he covers a lot of ground, specifically he doesn't make assumptions of us knowing those inbetween steps

[@ChadsPrep]

Glad you're finding these lectures helpful Cody!

[@ShadowVsGaming126]

You really do have a talent of explaining things in such a simple way. We all appreciate it, thank you Chad!!

[@ChadsPrep]

You're very welcome and thanks for the encouragement! Happy Studying!

[@Eric-sq4hd]

whaaaaat I swear this is MAGIC! I have been wondering about how weak acid and strong base creates a buffer... and then wow. look at that. no one else explains these concepts so clearly

[@mahdihasan6686]

We viewers always appreciate your purposeful assistance to the students those who doesn't have opportunities good quality learning. Chad Sir is really a TEACHER. Those who making videos are not teachers ,not even Khan Academy. We want teachers to teach stuff. Thanks to Chad and his video crew to handling tough recording with amazing teaching content. This channel will soon spread out manually to the impoverished students to get their finest concepts with moderate teaching materials. Love From BANGLADESH. #TeamRADOX

[@ChadsPrep]

Thanks Mahedi and I'm glad you found it helpful! Love back to Bangladesh!❤

[@theopenacademy9102]

I really love your videos Chad! I can sit through 2 hours of modules taught by my professors and still be confused about a bunch of things, but with you i'm crystal clear after only a 15 min video. I really love that you're making new videos and I'll definetly be using them this sem for Ochem but there's just something about watching and learning from a professor teaching a class that really helps me learn, I really hope that you don't replace these videos with updated ones and keep them archived on here for learners that do better with this style. Even for calc Proffessor Leonard and Eddie woo were godsends. If you happen to have Ochem videos in this type of class format please upload them!! Please keep doing what you do! So many people appreciate you! Stay safe!

[@ChadsPrep]

Hello Hamza! With the pandemic, the newer ochem videos from my home office with no class will have to do. And while there are certain logistical advantages to this format, I, too, much prefer the in-class format. And even when I get around to replacing the gen chem set (hopefully with a class present) these will remain archived...no worries! Happy Studying!

[@theopenacademy9102]

@@ChadsPrep Yea there's just something about having the class element that changes how the information is disseminated that I can't quite put my finger on, but makes a world of difference for me personally. I understand, and great thank you!!! I really want these around so I can keep recommending this series to people! Also during last semester with the pandemic and having no access to campus lab I've been working on settting up my own at home, a recent project of mine has been making sodium without electrolysis using tertiary alcohol catalyzed magnesium reduction of lye and I recently had sucess! I would really love to send you some as a token of my appreciation if you're interested!

[@emirgonc4892]

Sir I just discovered your lecture and THIS IS AMAZING ! You keep it simple, yet very effective. Thank you very much for the content !

[@ChadsPrep]

You are welcome - glad you found us!

[@eilenecorcoran2094]

I teach AP Chem, and these acid base concepts are tough for the first-time learners. They LOVE having your videos to watch to help them understand. They think you are COOL...not sure that they think acids and bases are cool, just yet, but we're getting there!

[@ChadsPrep]

Glad the channel is helping out - Happy Teaching to you and Happy Studying to all your students!

[@raizenzoldyck7563]

YO! I JUST NOTICED U GOT 40K SUBS NOW! IT WAS LIKE LESS THAN 29K WHEN I FOUND YOUR CHANNEL LAST MAY 2022! THANKS FOR THE FREE LESSONS CHAD!

[@ChadsPrep]

Glad you found the channel!

[@uneti463]

Chad, I will have my professor watch your videos so she will learn how to get throuh the 3 hrs class where i leanr almost nothing! Here learnt in 15mins like nothing! thank you

[@ChadsPrep]

Glad the videos are helpful, Un Eti.

[@Mandenga100]

You are such a good teacher.

[@ChadsPrep]

Thank you.

[@diyojen7787]

this is the probably best buffer lecture video thanks agent 47!

[@ChadsPrep]

You're welcome. And you may have blown my cover.

[@maricelalopez441]

Chad you are a good teacher. I wish to be a good teacher A.K.A mentor one day. Help the inner community where it is needed most! Thank you for your time and help.

[@ChadsPrep]

You're welcome - Thank you.

[@pamilerinawosuru6856]

Thank you so much 🥰 Having final biochemistry exams today . I just understanding this

[@ChadsPrep]

Hope you do/did well on your exams - glad the video helped!

[@codyellsworth7927]

Very high quality teaching.

[@ChadsPrep]

Thanks, Cody!

[@benspearnyasulu9023]

Thank God I found you sir,i have really been helped a lot

[@ChadsPrep]

You're welcome - Happy Studying!

[@z_max33]

Chad is the GOAT

[@ChadsPrep]

Thx

[@drrrajkumar262]

Outstanding explaination

[@ChadsPrep]

Thank you

[@SuperSmith]

The David-Hasselhoff equation is going to tear down the Beryllium Wall.

[@afraaldhaheri5635]

this was VERY helpful. THANKS

[@ChadsPrep]

Glad it was helpful!

[@devpatel2842]

You mention using a 2:1 ratio with a strong base, but what if the strong base is Ca(OH)2? Would the ratio change then because both OH- would dissociate? In advance, thank you! You rock!

[@ChadsPrep]

Ahhh, great point Dev! You would definitely want to adjust the ratio for one of the group 2 metal hydroxides like Ca(OH)2. In that case it would end up being 4:1 instead of 2:1. Nice catch!

[@devpatel2842]

@@ChadsPrep Definitely worth using that on your students to confuse them. (insert evil teacher meme)

[@bradleymiller7371]

Absolute genius. Gary Cabirac has nothing on me after watching this video!

[@ChadsPrep]

Kudos!

[@curtpiazza1688]

Great teaching methods!

[@ChadsPrep]

Thanks, Curt!

[@Mohammednur2]

Chad is the Goat🎉

[@ChadsPrep]

Thank you!

[@sunilthapa1539]

Chad the best!!

[@ChadsPrep]

Thank you!

[@devikanair44]

Hi Chad! Quick question. what do you mean by if you have "just a weak base" use the shortcut method. Doesn't having a Weak base create its conjugate acid? So then couldn't you use the HH equation? I guess I am confused when you differentiate using them. Thanks!! Super helpful :)

[@ChadsPrep]

Hello Devika! While a weak base will dissociate to form a tiny amount of its conjugate acid, the key is that the only ingredient added to the solution was a weak base. We would call this a solution of a weak base (even though we know there would be a tiny amount of its conjugate acid present in the solution too). But if you were to add both the weak base and its conjugate acid into the solution so that there are now significant amounts of both in the solution, this is now a buffer solution and you could use Henderson-Hasselbalch to calculate the pH. Hope this helps!

[@devikanair44]

@@ChadsPrep you are amazing. thank you so much!!

[@abushmaisthuraya2161]

thank you so much😍😍

[@ChadsPrep]

Very welcome.

[@beerizik4890]

man i respect you so much god bless

[@ChadsPrep]

Thank you - you as well.

[@terencetrouve5676]

I dont understand the last example for buffers NaF+HCl-->NaCl + HF. HF is a weak acid then it needs a conjugate base. Can't we consider NaCl as neutral? Or should we just consider Na=0 (Group 1) and Cl by itself is a weak base, thus we have a 1:1 ratio between a weak acid and a weak base and then...a buffer?

[@ChadsPrep]

The buffer isn't the combination of NaCl and HF. The key is realizing that you're only going to add half as much HCl as NaF. This way you'll have some NaF left over and still have produced some HF. It is the combination of these two that is the buffer. Hope this helps!

[@patrickstar7693]

It gets always talked about the addition of a strong acid or strong base... my question would be how to calculate the ph with the addition of a weak acid? Lets say the addition of acetic acid to a phosphate buffer

[@ChadsPrep]

Hi Patrick, the pH change when a weak acid is added to a buffer would be pretty negligible since the weak acid is not fully dissociated. You would first use the Ka of the weak acid to calculate [H+] rather than setting [H+] equal to the concentration of acid added.

[@patrickstar7693]

@@ChadsPrep thank you that helped a lot!

[@ChadsPrep]

@@patrickstar7693 Excellent!

[@aidenmccarty335]

Our entire gen chem curriculum is based off of your videos, you should send my college a bill haha

[@ChadsPrep]

Glad the channel is helping - Happy Studying!

[@lunakim7268]

thank you so much! it helped me!

[@ChadsPrep]

You're welcome, lk vocal!

[@ayanabdirizak9287]

THANK YOUUUUUUUUUU

[@ChadsPrep]

Yoooouuuu're welcome!

[@thatbossguy123]

Hi Chad, just a quick question. For that buffer calculation at the end of the video, you said you could use that shortcut for weak acids and bases, correct? When I try to use that shortcut, it does not work. I plug in the square root of Ka 2.5x 10^-6 (0.1M) and then I take the -log of that answer and I end up with a pH of 3.3. Am I missing something? Thank you!

[@thatbossguy123]

nevermind I see where I went wrong haha.

[@ChadsPrep]

👍

[@thatbossguy123]

@@ChadsPrep haha. Chad I sent you an email (its from Gregory Forlenza) and I just had a question about a different video. I would greatly appreciate it if you could respond! Thanks!

[@EmmyDeGuitarPreacher]

Helpful

[@ChadsPrep]

Great!

[@leahaketch8783]

I like the way you teach, you are amazing big 👆

[@ChadsPrep]

Glad to hear it, Leah - Happy Studying!

[@Yankee4ever2]

This guy teaches better than my UCLA professors

[@ChadsPrep]

Thanks, Yankee4ever2 - glad you found the channel!

[@tulongashowa1420]

Gypsy King has done it again🔥🔥🙌🏾💆🏾‍♂️

[@ChadsPrep]

Great!

[@tulongashowa1420]

@@ChadsPrep Thank you this video has me very much all the way from Namibia💆🏾‍♂️🙌🏾💪🏿

[@ChadsPrep]

@@tulongashowa1420 You're welcome, tulonga showa - from U.S.A.

[@curtis4994]

you're the coolest

[@ChadsPrep]

Thank you

[@detectiveconan2840]

nice !!

[@ChadsPrep]

👍 👍 👍

[@templeknight9338]

cool

[@ChadsPrep]

Glad you found it helpful Kyler!

[@aliatdenton7835]

I love you

[@ChadsPrep]

Glad the channel is helping!

[@yogeshrajbanshii]

Johny sir

[@ChadsPrep]

Welcome to Chad's Prep - Happy Studying!

[@hwnytb]

Senİn ağzını yerim 3 saatlik dersten anlamadığım şeyi adam 5 dkde anlattı

[@ChadsPrep]

Welcome to the channel.

[@icemanchi]

Erik ten haag

[@markom2928]

Speak slower please!

[@ChadsPrep]

Sorry you are having trouble, Marko - did you know you can change the speed of the video? All you have to do is choose the Settings 'gear' at the bottom of the video. Then you can change the playback speed to your liking. Enjoy!

[@markom2928]

@@ChadsPrep People in the class can't do that, I sympathise with them : ) make some effort and speak slower! JK, it doesn't diminish much the quality of the way you teach, you explain everything super clearly. I myself speak fast. Tnx for all the videos : )

[@ChadsPrep]

Marko, I will be updating and re-filming this playlist throughout the school year and coincidentally will be filming the first lesson today. I'll make a concerted effort to speak more slowly. Best!

[@lekanganambela5183]

cool

[@ChadsPrep]

thx