Equilibrium Equations: Crash Course Chemistry #29

[@crashcourse]

Pssst... we made flashcards to help you review the content in this episode! Find them on the free Crash Course App! Download it here for Apple Devices: apple.co/3d4eyZo Download it here for Android Devices: bit.ly/2SrDulJ

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Hank has legit assisted me through high school, my bachelors and now my doctorate program. Can't even thank him enough.

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"Chemistry is proof that the universe is messing with us." YES THIS EXPLAINS SO MUCH

[@Everythingonfire9]

Lmao actually started to cry watching this because of how screwed I am for my equilibrium test in two days

[@--flowersGiftSeattle]

me. too

[@Melissa-zb1xm]

+Molly Seidl im thinking the same thing..... the only difference is that my test is in two hours and i cant understand a thing :((

[@MegaMissnaomi]

+Molly Seidl in two days? you still had time to learn it! i have the test tomorrow morning and it's eleven o'clock already.

[@aryanshetty6536]

Ever noticed why no guys said this?

[@EricWarriorPrincess]

+Silke B That guy is just trolling everyone's comments. Don't feed him.

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My two year old always says "Hi" to the iPad when I watch these. He seems convinced that I'm face-timing with Hank Green!

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haha cute! ♡

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Why are you watching this if you are old enough to have a kid?

[@aloevera1269]

@@aaaadit5155 she might be a teen Mom or just a young mother. Or maybe she is just curious about learning more chemistry! ^~^)/

[@rina-sc7tz]

@@aaaadit5155 not every parent knows chemistry. tons of hs don't take chem or arent fortunate to go to hs or finish

[@asterism_s]

@@aaaadit5155 it could be a 2 year old brother or sister

[@jasmeena3253]

At 7:24 one of the answers shows as 9.868, instead of 9.683 (although just a minute later they show the correct number, 0.9683), and I know that this episode has already been published for so long, but I just wanted to point it out in case anyone else got confused like I did. Thank you so much for posting this video for me! It really helped me to better understand!

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I love how these videos get me amped up and ready to do homework. I was so unmotivated 10 minutes ago. Thanks.

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This is the only thing keeping me alive in AP Chem.

[@Nizzythebest]

same. I'm in IB chem and it's a struggle

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***** No one asked you. Just kidding. I love AP Chem

[@innocentboyzthegreat]

***** This came in too late for me lol. IB chem was hard.

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Woooo America

[@mattlyons9027]

innocentboyzthegreat and I can confirm ib chem is still hard

[@ferventfei]

"simple and totally not scary calculations" * intense fear *

[@henrynguyen77]

Hank i cannot bring up the words to describe how much i love you rn. i have my chem test tmrw and do not understand this concept at all and you have explained in 5 minutes what my teacher tried to teach me in a week. Hank you are truly a man sent from the heavens. I will pray to you on your dedicated shrine everyday

[@faithkoralewski5362]

Here as proof that homeboy will get you through high school AND college chemistry.

[@MrDylan2125]

I love how Hank doesn't shy away from the numbers. I get that they are super basic equations, but they are extremely useful for those of us who are still fairly new to Chemistry.

[@Joshua-nw9pg]

This channel is really carrying me through school during quarantine

[@annikaclark2873]

Watching Crash Course videos all morning for chemistry is one of the perks of being a homeschooler…. Wooh.

[@ScareSans]

Indeed, homeschooling is wonderful.

[@Jojobinks9898]

Two years later and this is still accurate as hell, thank you crash course

[@shilpakaran1]

Hank, you make chemistry so exciting!

[@itsjvf33]

IB Chem exams tomorrow.. wish me luck guys.

[@osu_fishy]

How'd it go?

[@2611Jackson]

JayVinFoong IB? RIP

[@itsjvf33]

Jackson M I survived guys! Did better than I expected! =D

[@vashappeninjas]

You are my hero

[@shelan7058]

I have an exam tomorrow too. In like 12 hours.

[@FartCloudEmergency]

If you're wondering how he got the quadratic equation: 115=(4x^2)/[(1.00-x)(2.00-x)] since (1.00-x)(2.00-x)=(1*2)+(-1x)+(-2x)+(x^2)=x^2-3x+2 then 115=(4x^2)/(x^2-3x+2) subtract 115 from both sides: 0=[(4x^2)/(x^2-3x+2)]-115 Common denominator step: 0=[(4x^2)/(x^2-3x+2)]-[115(x^2-3x+2)]/(x^2-3x+2) 0=[(4x^2)-(115[x^2-3x+2])]/(x^2-3x+2) since 115(x^2-3x+2)=115x^2-345x+230 then 0=[(4x^2)-(115x^2-345x+230)]/(x^2-3x+2) 0=(-111x^2-345x+230)/(x^2-3x+2) =(111x^2-345x+230)/(-x^2-3x+2) multiply (-x^2-3x+2) on both sides: 0=111x^2-345x+230

[@wopol538]

Or for something more simple: 115 = 4x^2 / [(1.00 - x)(2.00 - x)] 115 = 4x^2 / (x^2 - 3x + 2) 115(x^2 - 3x + 2) = 4x^2 115x^2 - 345x + 230 = 4x^2 115x^2 - 4x^2 - 345x + 230 = 0 111x^2 - 345x + 230 = 0

[@FartCloudEmergency]

daniel luna Ooo, nice one! That simplifies it, so thanks.

[@chopsuie]

My brain is so hurties... BUT I think im learning.. something

[@tinatran3223]

Thanks. I understand chemical equilibrium a bit better with these crash course videos.

[@gattsu6197]

Only thing I learned from this video is that I have to wing my next test :D

[@zoecashman6354]

lol same

[@TheHolySC]

Anyone else watching this before AP chem test?

[@mihirjoshi9874]

Me

[@astridhansen573]

Me, I'm taking it tomorrow!

[@josiahklein70]

Crash Course Mathematics, anyone?

[@pranavchintalapudi3998]

yes yes yes yes yes yes yes yes

[@abrajrashid9856]

Yup...

[@thedoublehelix5661]

what does that even mean though?

[@13blackandwhiteroses]

I wish I found these videos months ago when I first started my class. Anyway, thank you Hank for being so dang awesome.

[@hizeeys]

Wish I found out about this before... would've helped me through the tough year. Binge watching for the AP Exam tomorrow. Helps so much.

[@Joanna-if6er]

I read all the odd stuff on the crash course beginning montage, and Chemist Hank, I too, think myself an artist, and want my own particle accelerator.

[@megscorner3596]

AYYY FLASH

[@NeoUno866]

The math and how it fits all together is almost poetic.

[@Madgirlwithatumblr]

I've got a Chemistry exam tomorrow and this is really helping me sort it all out!

[@matthew3496]

I really like how you have a table of contents in the description! its very useful

[@cornishphilosopher]

Whenever he says "The script supervisor is Katherine Green" I get this image of the Katherine just looking at the scrip, pointing and saying "This bit's stupid!"

[@eighthourlunch]

Thank you Hank, for teaching and old dog new tricks! I'm not sure I'd be surviving my gen chem 2 course right now without you. Wonderful work.

[@nope.13]

Hank, YOU SAVED MY LIFE! thank you! thank you! thank you! My professor kept babbling about this for 45 min and I didn't understand a word!

[@null_foo]

crash course about to drop the hardest beat of 2018 at the end with that intro remix

[@shooter45b]

after I watched this video I now know why people cheat on test

[@eddykhan6672]

+Albania Albanian haha why ppl cheat on test?

[@theslimyfreakofcourse]

+Ahmad Iftikhar Because it's ridiculously difficult for 9th graders

[@shadowzabyss]

+The Real Cake Is this ninth graders... are you sure????

[@barmiro]

+The Real Cake is it really? it's pretty basic stuff...

[@aepceo1]

+barmiro The math is pretty simple but the algorithm memorization is a pain sometimes.

[@TheRyan247]

I do not go to school anymore and i have great fun watching. Wish more people would learn to love this kinda of stuff.

[@fordphillips5921]

3:41 "what you need to see is that the quotient on the right must always yield the same number be cause IT S A CONSTANT" cracks me up every time haha i love this guys videos

[@rinireeti]

thank you a million times for making the equation solving as easy as making rice!!! my chem teacher sucks to the core but YOU JUST SAVED MY LIFE!!! THANK YOU AGAIN!!!!

[@Pvsmounish]

Excellent! Tricked my Chemistry teacher by asking doubts!

[@deadmanperipherals]

damn, did not expect to use quad formula in chemistry. The more you know.

[@Whats_noah_up_to]

"Totally non scary calculations " lol

[@Bobbylim323]

Isn't that complex, if you need to find equilibrium, draw rice. If you don't have a numerical value at equilibrium, use unknown X. For the theory part, just use LCP to answer your way through. IMO, chemical equilibrium is way easier than ionic equilibrium or chemical kinetics

[@Mira-bp2ye]

Crash course is so amazing! i'm so happy i don't have to read through my overly and almost purposefully complicated text book now.

[@ripwitch9833]

This was explained in a way more complicated way haha. I don't even think he told us how you get the change part really. Thanks for this so I get a night before session in!

[@KasraChehrazi]

Well, now I understand Rice tables. Thanks Crashcourse!

[@veigar7]

As the X is always so small you actually can take it out of the equation at @6:48 where you have to subtract it or add it to the numbers. On the other hand you can't where you are multiplying for obvious reasons. This helps you skip the dreadful aftermath.

[@howdougetoutofhere]

veigar7 That's just for when x is small. When the molarity is over 1000 times greater than the k value, x is small works.

[@rachelyorty2706]

Accidentally left the speed setting on 1.5 when starting this video. Just about had a seizure. I usually have to speed up other videos because they go through the material too slowly. Not crash course, though.

[@TheFireflyGrave]

For anyone curious, in the scene on Hank's shirt, Admiral Akbar is saying 'It's a trap' (as I'm sure you could have guessed.)

[@toze5698]

It s 2am and i have a test tomorrow,let s see how it goes :D

[@TSK_Dillards]

Well how was it?

[@bovinespongiformflu]

i love the very subtle the ocean is acidifying because of the increased co2 in the atmosphere message. very smooth. people wont even know they are being indoctrinated.

[@isabeladohu6503]

The only thing that helps me go through chemistry

[@Integrelle]

I love how I watched this in chem 11, and now im right back in first year chem lol. Some teachers just cant teach ~not all smart people are good teachers, and not all teachers are smart people. lol god bless you Hank, god bless you and your team.

[@anthony-does7879]

Exam in 2 hours

[@ElmoRoxTheCrayon]

Studying for my AP Chem exam!!!

[@MormonJesus619]

me too i have mine tomorrow.... literally all ive done today is watch these videos lol

[@dfhgjhg]

Cool, this is exactly what we are doing at school. Almost skipped the video because I did not know the translation to the terms. Nice recap for me

[@nils311]

Darn you, Hank! The quadratic equation is giving me flashbacks to algebra in high school. -shudder- (my teacher taught us the formula to the tune "Pop Goes the Weasel")

[@zykinftww]

AP exam in 2 hours, still watching Hank's videos. Nice review.

[@natesmith8031]

At roughly 8 minutes when Hank puts in the x-values to find the equilibrium amounts of the products and reactants, did he incorrectly put in 0.968 opposed to 0.986 or did I miss something?

[@ethantheclever]

+Nate Smith Good catch. That was a mistake.

[@jiwonkim3997]

Hank, you are simply AMAZING. Thank you so much!

[@bearshuas]

Chem test tomorrow... Thank you so much, Hank. This video has saved me!

[@golivia8084]

This is the one thing of IB Chem that I cannot wrap my head around. Who the hell. Why the hell...just help me God I am not prepared for exams involving this.

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Im gonna donate my college funds to crash course this channel helps me more than my class ever could

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I wish I knew this channel existed while I was in high school.... >.> would have helped me out a lot! I was so confused in chem!

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I will NEVER forget the Quadratic Formula thanks to my 8th grade math teacher who taught it to us by setting it to the tune of Pop! Goes the Weasel

[@cyncosmos]

You freaking rock. I learned more in 10 minutes than I did in two 75 minute lectures from my chem prof.

[@EricWarriorPrincess]

At 4:17 in the video the H2CO3 bubble should be growing larger (with the H2 bubble) but instead shows to be getting smaller. If you guys can't correct your videos, please at least make note of corrections in the video description because simple mistakes like this can still be very misleading and not to mention, all your videos get a very high % of likes which makes people trust their content.

[@aryanshetty6536]

+EricWarriorPrincess Not many people care (except some really depressed or obsessed idiots who actually are the only ones who realized its wrong. The majority will realize it only after they read the comment. So just keep your comments to yourself).

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+Aryan Shetty That was absurdly horrible.

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+Aryan Shetty your comment is so stupid on so many levels...

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+Aryan Shetty Yeah, how does he even DARE to point out an error to make the content better?! Nobody cares, what a waste of comment space. */s*

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& u r right bout d trust part😀 ... I definitely doubted my ability to understand d content at first cause I trusted this channel so much😅😅😅!!!!

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Finaaly i understand why we learn that ******** maths thanks dude awesome!!!!!!

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Oh hey quadratic equations, didn't expect you here, nice to see you again. Glad to see you're being helpful. :D

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Mr. green , you are the best chemistry teacher

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ALL HAIL CRASH COURSE Carrying me through my mid and high school GG

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you mentioned an algebra formula in your video. i was trying to figure it out for months! Thank you!

[@XyBeatZHipHopInstrumentals]

This is an awesome way to learn ! I enjoy it very much even this is not my language .. Keep up the good work !

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AP chem rest is tomorrow, if I get higher than a one I’m thanking this guy

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We got this brother. 45% is a 3. I’m not confident either but during these unique times an ap exam isn’t the most important thing.

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@@AVGII *test

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Why is the Crash Course theme SO awesome?

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I love you, Hank

[@kevinsanthosh3537]

What i learned • Make great videos • product is more people subscribing you And then equilibrium

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play it in 0.75x to hear normal talking

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Thank youuu

[@marianna380]

loll i do .5 bc im just that dumb

[@kaedynnh4608]

Most often, you would really just use the same equation Hank showed in the video (products/reactants = Keq). The final concentration of the products would be determined using some form of analytic technique (spectrophotometry, chromatography, etc.) depending on the reaction. You can then calculate the final concentrations of the reactants. From there, it's just a matter of plugging your concentrations into the equation to calculate Keq.

[@jmoney2568]

The captions need to be semi transparent/ opaque !!!! I need to see the numbers!! Thanks for what u all r doing here !

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This guy explains things so much better than my chem teacher

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Currently I'm in Chem III at my high school which for my school is a dual credit course through a university. We are just starting it now.

[@paulsherrill]

It may not be more descriptive, but it is more precise. "Power" is a fairly common word with many meanings... In physics, for example, "power" has a technical meaning and it's nice not to need to say something like "the power of the power" when you mean "the exponent of the power."

[@karlxmontefalco1624]

Hey CrashCourse I hope that you would notice me. Watching your opening video makes me enjoy the video that i am watching. I hope that you will put more animation to your videos for it will not just give us knowledge but also entertainment

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This helps so much, you make it possible to pass chemistry 30. I hope I pass my chem test tomorrow.

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HANK YOU ARE MAGNIFICENT

[@dannyhuang8773]

According to what I learned. Sometimes, you can simplify the algebra. For example, you try to find x and you have to information K=1.3*10^-22=x^2/(2.00-x). The value of K is very small so you can assume that x is also very small and negligible. Therefore, you can assume 2.00 - x = 2.00 and solve. x^2 = 1.3*10^-22/2.00 and then take the square root and get 8.1*10^-12. You can find that x is indeed very small. You can check by subtracting 8.1*10^12 from x. In the end, it would still be 2.00 after you round it to the right number of significant figures.

[@jorgepadua5802]

Oh my God, you simplified it so much!!

[@ncdefenceman]

Thanks for the good explanation; keep up the good work!

[@DavidBuckleybestprogrammer]

Man, this is like my grade 12 chem class all over again

[@sarahv3546]

OK i'm confused: at 4:24, there is the example of the equlibrium equation, where if H2 is increased then either CO3 in water must decrease OR the the H2C03 must increase sureley (i.e the reaction is pushed to the left!?). But the animation shows the H2CO3 bubble gets smaller!? am I going insane? or is crashcourse sending me insane?? ;)

[@gtd3765]

I believe the CO3(2-) gets larger due to being pushed to the right. The Carbonic acid concentration (H2CO3) needs to be raised due to H+'s concentration being high. Basically, they use up the H2CO3 to create more CO3(2-) to balance out the H+ ions. They should have shown CO2 decreasing though to make it clearer.

[@brontechristian823]

Thank you so much for these videos!

[@uimasterskill]

Pardon me if I understood this wrong, but I hope somebody can tell me what is correct: Hank says in this video as well as the previous one that equilibrium is when the forward reaction happens at the same rate as the backwards reaction. But as far as I learned, those two rates don't have to be equal, they just have to be CONSTANT (for instance you could have much more reactants turning into products than products turning into reactants but it would still be an equilibrium reaction). Thank you!

[@2joshua123]

Yes, this is getting up there. My simple high school education is no long cutting it anymore. I wasn't to clear on the last vid and now I losts. Is it to much to ask for some work sheet so that we can apply this Crash Course?

[@DianaDial]

Thank you Hank for making Chemistry cool to like !

[@amalahmed78]

i wish this guy would be our chemistry teacher he explains so much better then my teacher

[@zaw408]

I took all these stiff in highschool, why can't I stop watching these videos??

[@rnj117]

have a test on this this afternoon - thanks hank :)

[@coolgirl473]

sing this with the melody of pop goes the weasel: x equals negative b + or - the square root of b squared - 4 ac all over 2a ..... you will never forget this equation again!!!!!!!!!!

[@TheRockStar04261999]

+CrashCourse Thanks so much I understand it now. Really glad I found this video because I have a test in grade 12 chemistry tomorrow

[@nishatiwari9212]

Please make a series on crash course mathematics ⬇ Support those who want this.

[@NicoleG675]

Oh wow, that's weird. I have my Chemistry summer homework booklet out on the desk in front of me open to the page about reversible reactions as I procrastinated by watching my KZbin subscriptions

[@fangirlxlyrics360]

How did you get the values at 6:49 ???