17.1 Buffers and Buffer pH Calculations | General Chemistry

[@AnhMinh-tf7xu]

How do you feel knowing that you just saved not 1 but at least 20+ people from headaches of retaking General Chemistry next year? This is in our final evaluation exam, and you just summarized our 2 weeks of lectures and laboratory demonstrations into a 45 minute video that is concise, detailed but much easier to understand. Your incredible work makes me question why are we paying so much money to these "professors" only for them to not do their job properly. Thank you Chad, thank you.

[@ChadsPrep]

You are very welcome - glad the channel is helping you and many others!

[@Trynnagetmydegree__]

Omg thank you!!! This made the topic more clearer 😭😭😭 I don’t get why professors just vomit all the calculations on the board without thoroughly explaining it like you did😭. Thank you again man this really helped me!

[@ChadsPrep]

Glad the channel is helping you - Happy Studying!

[@courtneyjohnson5529]

This is actually the most helpful video for this topic on youtube in my opinion. Thanks A TON!!

[@ChadsPrep]

You're welcome - Thank you.

[@Pixillious]

Chad you, absolute legend. Your OChem videos were a godsend. They carried me to pharmacy school. Now I am reviewing your gen chem videos for my BioPharm calculations. Just wanted to say thanks for posting the most valuable science videos on the internet.

[@ChadsPrep]

You're welcome and thanks for saying so - glad the channel has helped you so much. Happy Studying!

[@Pink_1012]

The way you taught me this so quickly when I've been struggling the whole week on this is crazy 😭 I love how you don't write too much on the board at one time it makes it so much easier to follow compared to my lectures. God bless your channel thank you so much

[@ChadsPrep]

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[@ramishaarzumand4522]

I am halfway through this video yet I am already covinced that this is the best video about buffer on KZbin.

[@ChadsPrep]

Thanks for saying so!

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One of the most helpful channels I've seen. Please do organic chemistry 1 and 2 videos!

[@ChadsPrep]

Thanks for the suggestion Emil :)

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[@ChadsPrep]

Appreciate all the kind words - glad you found us!

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A big salute from Kenya .I love your way of teaching.

[@ChadsPrep]

A big thanks from USA - Happy Studying!

[@2DRichochet]

Starting my first semester as a Toxicology Biochem grad and I'm going in with only an undergrad degree in biology with no experience in organic or biochem, so I've a lot of catching up to do. These early sorts of concepts are novel to me, but the way you explain them is so easy to follow and helpful! Thank you so much for helping to take the stress out of things!

[@ChadsPrep]

Welcome to the channel, Silver Atlas - glad it's helpful - Happy Studying!

[@pleurote6988]

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[@ChadsPrep]

You are most welcome!

[@jarzan9179]

bliss neither my teacher's powerpoints nor chemistry libretexts are as concise as this video, i thought i wouldnt be sitting here for 45 minutes but this was just really helpful

[@ChadsPrep]

Glad you found us!

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im taking chem 233 online right now and your channel is a life saver!!

[@ChadsPrep]

Glad you found us!

[@vaibhavgambhir9383]

Got an exam tmrw, and this prob the best vid on buffers Thanks!!

[@ChadsPrep]

Great to hear! Good luck on your exam

[@Gabriel-xn8ye]

You are pedagogically gifted. Thanks for your videos.

[@ChadsPrep]

Thank you and you are welcome

[@fraserblack4016]

Really helpful video thank you! Can you further explain why it is necessary to use number of moles in calculations with limiting reactants rather than molarity?

[@bridgetteboamahmarfo2549]

You explain this to make it so easy. Was on organic chemistry tutor channel and understood nothing. Thank you so much

[@ChadsPrep]

Glad you found the channel, Bridgette!

[@skylardean4540]

Let's gooo! Feeling prepped for the next test!

[@ChadsPrep]

Hope you ace it.

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That is awesome! Much more easier than what our teacher taught us!

[@ChadsPrep]

Glad it helps!

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[@ChadsPrep]

Glad the channel is helping you.

[@musengekanjela3303]

You deserve more subscribers

[@ChadsPrep]

Thanks for saying so.

[@johnpike8010]

Thanks mate, this video was better at teaching me about buffers than the 3 year chemistry degree i did.

[@ChadsPrep]

You're welcome - Glad the video helped.

[@wanipakowalska776]

Was sacred... but after watching this, am in love. Thank you sir🦋

[@ChadsPrep]

Glad the video is helpful.

[@saqibkhan3364]

Hello Chad, this was a great lesson. Definitely one of the harder concepts for me as I study for the MCAT. Question for you: As you state, a buffer is composed of a weak acid and its conjugate base or a weak base and its conjugate acid. Because a weak acid has a strong conjugate base and vice versa, could we say that a buffer is composed of a weak acid and a strong base and/or a weak base and a strong acid? Might have to rewatch some sections. I hope my question makes sense. Thanks for all your help

[@saqibkhan3364]

For example, around 22:45, you say something along the lines of, "you can use the Kb expression because you also have a weak acid's weak conjugate base." But I thought from previous lessons, that a weak acid will have a strong conjugate base and vice versa. Why is it different in this case?

[@kathode1]

saying its composed of a weak acid and a strong base would imply that it’s actually a strong base like NaOH, KOH, etc and vice versa. you’ll be safer just saying a weak acid/base and their conjugate base/acid

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[@ChadsPrep]

Great start to the day!

[@ys92legand24]

Ive been going through your acid-base titration and buffer videos and they are super helpful thanks I have two questions though: Can you not have a WB:CA buffer? and how would you calculate SA:WB buffer? Thanks again

[@triple_gem_shining]

Wb/ca buffer is the same as a wa/cb buffer. That's the DEFINITION OF A BUFFER! As for SA/WB buffer yes. But it's in a 1:2 ratio. Half of the wb is neutralized. Reverting back to 1:1 of the two conjugates

[@FrontierThesis]

Regarding 25:15, would you recommend that we memorize all the different versions for the MCAT? What if they give us a question involving bases/Kb?

[@barbarvssa]

can you please do more exercises with no volume/ molarity given of a weak acid/base and need to find volume to titrate to a particular ph? ones with M and V given are too easy.

[@JossinJax]

Hi Professor Chad. I appreciate your content. Quick question, you mentioned common detractors @21:12 and state that 0.1M solution of HF and a 0.1M solution of NaOH won't make a buffer, but what if it's a 2:1 volume ratio in favor of HF ?

[@ChadsPrep]

In this type of question you may be provided the volumes and concentrations of the solutions that are being mixed (what you are suggesting) or you may be provided with the final concentrations of the resulting solution (what I was referring to). You can typically tell the difference and the biggest clue is often whether or not volumes are provided. Hope this helps!

[@JossinJax]

@@ChadsPrep …okay so if I understood you correctly, I would have a buffer in my scenario, but NOT in yours, right?

[@ChadsPrep]

Exactly right!!! 😊

[@JossinJax]

Thanks!@@ChadsPrep

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[@ChadsPrep]

Thank you!

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I saw that you had Pchem on your website for free If you dont mind me asking Is there a reason you dont upload them to your youtube channel? Also will you ever plan on doing thermodynamics videos?

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[@ChadsPrep]

You are very welcome

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I wish lecture was this simple.

[@ChadsPrep]

Glad you found the video helpful!

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i jut understood everything...thank you very much

[@ChadsPrep]

Excellent - you're welcome

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Very welcome

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the UCF chemistry department needs to start paying you. all the students use your videos over our prof's notes lmao

[@ChadsPrep]

That's pretty incredible - Happy Studying to all the students!

[@arashkkhanian4539]

Hello, can someone please solve this question for me, the pK value of an acid is equal to 5. What is the pH value of a 0.1 M solution of this acid?

[@gabosantiago5183]

I think the pH is 3.00 according to my calculations.

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Glad to hear it, Tommy - thanks!

[@shr3054]

I don't know how y'll be getting 3.2 because when I calculate I get 0.8325089. I am so frustrated I don't know what's wrong with my calculation

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Amazing

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You're welcome, bic!

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