Introduction to pH, pOH, and pKw

  Рет қаралды 597,202

Khan Academy

Khan Academy

Күн бұрын

Пікірлер: 201
@parcekz9934
@parcekz9934 6 жыл бұрын
Honestly Khan academy is the reason I get mid to high grades, you explain it in a way someone who has never encountered the subject might actually understand. Thanks a bunch!
@ismailit1
@ismailit1 12 жыл бұрын
i once had a friend and he learned something from your videoes and now he is in harvard.
@no1everreallydiez
@no1everreallydiez 12 жыл бұрын
I love seeing comments about people using these videos for their MCATs and getting into Ivy League schools, etc. because it's encouraging news and shows the profound effectiveness that Khan's teaching has. THANK YOU! :) And I too will be using these videos for my MCAT to brush up on the basics haha. :)
@NeceeThaLady
@NeceeThaLady Жыл бұрын
No MCAt just regular ol biology 🧬 online at that
@Joel-js2gk
@Joel-js2gk 8 жыл бұрын
Not all heroes wear capes
@whostolemyTV
@whostolemyTV 8 жыл бұрын
Haha you win
@bobbysteakhouse7022
@bobbysteakhouse7022 6 жыл бұрын
Some wear hoods
@pohpvp3777
@pohpvp3777 6 жыл бұрын
Some teach chemistry physics mathematics economics and much more
@AFAbirALFA
@AFAbirALFA 5 жыл бұрын
khan is a good hero
@ahmadabdullah8168
@ahmadabdullah8168 4 жыл бұрын
@@gandiaulaad1155 so we are all heroes nowadays.. right? 😃
@Xiek11
@Xiek11 12 жыл бұрын
Is this really how simple this pH pOH thing is? My lecturer explained this in a really complicated way. Thanks a million. Great work!
@zillaboop
@zillaboop 12 жыл бұрын
this is amazing! i was having so much trouble understanding my chem stuff, and in one video you've made it crystal clear for me. i went from feeling overwhelmed and almost withdrawing from the course to understanding it well enough to explain to classmates! thank you!!!
@jimlahey5354
@jimlahey5354 2 жыл бұрын
Can we get an update on where you are now?
@zillaboop
@zillaboop 2 жыл бұрын
@@jimlahey5354 oh my goodness haha!! this was almost 10 years ago when i was 22! im a 32 now and working as a respiratory therapist! glad i passed that class so i could eventually graduate :)
@israrkarim65
@israrkarim65 7 жыл бұрын
I'm in 4th semester at university and I still struggle to understand the basic concepts. Thank you khan academy.
@MikeRoePhonicsMusic
@MikeRoePhonicsMusic 12 жыл бұрын
+1,000,000,000 for color-coding! It's extremely useful for organizing information!
@davidkim0678
@davidkim0678 12 жыл бұрын
just click on his channel > Featured videos > whichever subject you want to watch > click on video you want to watch..this way you'll be watching through his playlist and the videos will automatically go to the next one for you when it's finished.
@kalpanashedthy3101
@kalpanashedthy3101 4 жыл бұрын
8:19 of off.. I ain't off untill I watch this video fills my heart.😊
@RajYadav-yf9cl
@RajYadav-yf9cl 7 жыл бұрын
sals pickup line:"let me switch colour"
@amadeus_music
@amadeus_music 13 жыл бұрын
"of course water is desolved in water" :D Anyway, you're my science-hero
@daedra40
@daedra40 11 жыл бұрын
Thanks khan, as countless of them you could receive, each one is meaningful. Especially
@HassHansson
@HassHansson 5 жыл бұрын
Thanks Sal Khan, youre a legend among men
@sperg1
@sperg1 12 жыл бұрын
seriously i learn so much just by watching your videos there's no need for reading anymore! it's kinda funny XD
@giuliadepo2314
@giuliadepo2314 10 жыл бұрын
You're the reason why I won't fail my test :D Thank you so much!
@hardikkardam6116
@hardikkardam6116 7 жыл бұрын
me too
@dogsshit76
@dogsshit76 6 жыл бұрын
Giulia Depo
@pklmbyers
@pklmbyers 12 жыл бұрын
SoI have taken years of chemistry and NO ONE ever explained what 'p' was! Thank you!
@virupannamedikinal
@virupannamedikinal Жыл бұрын
Thank you so much Sal Sir, your videos are helping me a lot.
@BackCountrySR
@BackCountrySR 13 жыл бұрын
@The19thKey M represents Molarity, and the molarity is found by Moles/Liters of solvent, in this case water.
@melvinforesman5711
@melvinforesman5711 Жыл бұрын
Thank you for successfully teaching me a single concept in 3 mins that my professor failed to in 3 lectured :p
@theartyard
@theartyard 15 жыл бұрын
Thank you so much! Your explanations are so clear and easy to understand. You make super chemistry fun! :D
@NeceeThaLady
@NeceeThaLady Жыл бұрын
I’m in biology why am I doing chemistry??
@scarlettbildhauer
@scarlettbildhauer 14 жыл бұрын
This video was really helpful. You should have a comment section on your website so that students can give you feedback. Thank you!
@DennisBolanos
@DennisBolanos 5 жыл бұрын
You're cute.
@dramaticsloth3012
@dramaticsloth3012 12 жыл бұрын
Yes that made perfect sense, however is it just a temporary bond before the hydrogen ion moves onto another oxygen (not sure how it would since the charges attract) because an oxygen can't have more than two bonds usually. If i remember right it is dependent on what angle the bond is and therefore it can only hold a certain number, for instance i think water is held at 107.5 degrees .......
@adivakaruni
@adivakaruni 13 жыл бұрын
i wish i had found these vids while i was taking gen chem! so helpful and clear!
@bloodyfool69
@bloodyfool69 12 жыл бұрын
My friend got accepted in Harvard with the help of your videos, true story.
@necaccamo
@necaccamo 13 жыл бұрын
@The19thKey g/liter= density to get the molarity(M) you need to convert grams to moles. Molarity= mol/volume Volume= liters or millimoles/milliliters. =)
@Jfrancis221
@Jfrancis221 13 жыл бұрын
We should use (l) for H2O indicating it is a pure liquid, not (aq)
@paulceltics
@paulceltics 13 жыл бұрын
very helpful. this is something that is going to save my grade
@Rusty2891
@Rusty2891 14 жыл бұрын
@WarpFieldTheorist I received an email saying and I quote " And yet the protons and hydroxide ions are certainly part of an aqueous solution, in much the same way as sodium and chlorine ions can be part of an aqueous solution. When you study chemistry at university you discover that there are all kinds of weird structures floating around which are made of many 'water' units and ions. It is perfectly acceptable to refer to this swamp as an aqueous solution."
@r00bii
@r00bii 12 жыл бұрын
@splitecho Oh, Sweet! I'm using these videos right now for GAMSAT (Australian MCAT).
@dydx6584
@dydx6584 10 жыл бұрын
THANK YOU SO MUCH. I WAS SO LOST WITH ALL THE EQUATIONS AND EVERTHING
@dariusfullmer171
@dariusfullmer171 10 жыл бұрын
If we consider H2O to be aqueous it would be included in the equilibrium. Of course it is not included in Kw, so it should be referred to as a liquid, not aqueous.
@Dnj1zzzz
@Dnj1zzzz 9 жыл бұрын
+Darius Fullmer Yep, was just about to write this; essentially this is screwing up a lot of stuff lol
@MattiasJohnson
@MattiasJohnson 11 жыл бұрын
When he said that there almost always a probablility of anything to happen it got me thinking, couldn't it be a scenario where a watermolecule loses both of it's hydrogenatoms simultaneously, each one of them to different watermolecules? So like this happends: 3H2O ---> 2H3O + O ???
@terradan2013
@terradan2013 11 жыл бұрын
Thank you for explaining, in simple terms, what all this means.
@mvadim25
@mvadim25 13 жыл бұрын
@The19thKey Molarity is mole/liter
@swagerificable
@swagerificable 11 жыл бұрын
it shows you up the top of this page on the right hand side
@osama105
@osama105 12 жыл бұрын
you are soooo freaking amazing. like everything just makes sense to me now.
@joelarthurng1530
@joelarthurng1530 5 жыл бұрын
thank you khan really helped me understood the topic
@Janac
@Janac 13 жыл бұрын
@WarpFieldTheorist haha but rusty is completely right. khan made an innocent mistake, you cannot have aqueous water (which suggests water is dissolved in water). Thanks for point it out rusty, i don't feel that your comments are "bashing with education".
@navdeep_singh_suri
@navdeep_singh_suri 7 жыл бұрын
You made this chapter easy...thanks!
@Subaangen
@Subaangen 15 жыл бұрын
of course you are Indian...cleverest people in world...:)
@christyc463
@christyc463 13 жыл бұрын
@azndude3600 i don't know for sure, but since no one else has answered you... i think it's just something that happens from time to time randomly. atoms and their components are always moving (electrons, in particular) and occasionally, they move in ways that are very unusual, but not impossible..
@digiconvalley
@digiconvalley 12 жыл бұрын
jazakaAllahu khairun
@Rusty2891
@Rusty2891 14 жыл бұрын
@WarpFieldTheorist Water is not aqueous. When the word water is used in Chemistry it means H2O. There are no salts, no dissolved compounds or a 'swamp' of materials in this. If there was, it wouldn't be water in its purest form, and this purest form is what is being referred to here. And by the way, I am at University working my way through a masters degree and never before have I seen H2O (aq).
@azndude3600
@azndude3600 13 жыл бұрын
@christyc463 I think I found out. I think its a form of intermolecular forces and in this case its ion-dipole attraction.
@dogsshit76
@dogsshit76 6 жыл бұрын
azndude3600
@hamedmoradi5
@hamedmoradi5 9 жыл бұрын
i will never ever forgive my year 11 and 12 teachers
@dogsshit76
@dogsshit76 6 жыл бұрын
hamed alimoradi
@dogsshit76
@dogsshit76 6 жыл бұрын
Me
@That_One_Guy...
@That_One_Guy... 5 жыл бұрын
i hate my high school teacher more than everyone that pisses me in the past
@AFAbirALFA
@AFAbirALFA 5 жыл бұрын
@@That_One_Guy... can you please shutup?
@arstgkneio
@arstgkneio 12 жыл бұрын
Damn, you leave no room for ambiguity. I like that.
@x0xbethaNyyx0x
@x0xbethaNyyx0x 13 жыл бұрын
you're amazing.
@kaseymlanier08
@kaseymlanier08 12 жыл бұрын
@splitecho : woah that's amazing! nice going! what else really helped you do so well?
@alvaro2416
@alvaro2416 14 жыл бұрын
Thank you very much!! i was soo confused. Now i understand how this work! yay!!
@TheSadPaki
@TheSadPaki 4 жыл бұрын
How many subscribers he had at that time??
@RikaShion
@RikaShion 11 жыл бұрын
Sir, you have just offered a big big help !!!
@northlight72
@northlight72 14 жыл бұрын
Whoever you are, someday I want to meet you and shake your hand. There's nothing you can't put in understandable terms.
@Alfietto92
@Alfietto92 13 жыл бұрын
Flawless explanation =D
@mrcrumpet123
@mrcrumpet123 11 жыл бұрын
you are a god
@lyssss09
@lyssss09 12 жыл бұрын
Can u come here in australia and be my highschool chemistry teacher?:)) Thanks so much for this.. I understand it more that when my teacher was teaching us that:))
@4635683763
@4635683763 12 жыл бұрын
ooooooooooh my wooooooooooooord! absolutely love this vid's. going to save my (academic) career! thank you so much! :D (grinning like a boss)
@murdoc20000
@murdoc20000 11 жыл бұрын
why is the option to increase the play speed removed?
@agent475816
@agent475816 10 жыл бұрын
If Hydroxide and Hydronium are formed, won't they just collide together and turn back into water. Doesn't make sense, unless they are surrounded by water molecules. the OH- is surrounded by water molecules on the hydrogen side and the H3O+ is surrounded by water molecules on the oxygen side. If that's not the case, then they would attract each other right?
@abcdefgh-fb5ny
@abcdefgh-fb5ny 3 жыл бұрын
I wish my highschool teachers had taught me the concept like you did, instead of just giving us the formulas and letting us go figure out the problems ourselves. Then I wouldn’t have to re-study an 11th GRADE TOPIC
@lucasfelipedesousa8006
@lucasfelipedesousa8006 2 жыл бұрын
p stands for "Potentia Hydrogenia" (Potential Hydrogene Force)
@aussietro
@aussietro 12 жыл бұрын
Thats a great score! What else did you do?
@dogsshit76
@dogsshit76 6 жыл бұрын
Austin Friswold
@lourdeslopezdiaz9881
@lourdeslopezdiaz9881 7 жыл бұрын
Gracias por los subtítulos!!!
@efisgpr
@efisgpr 6 жыл бұрын
Sabías que todo el contenido de Khan academy.org está disponible en español también? Bueno, en interfaz español, por lo menos....y que tienen otro canal acá en KZbin que se llama "Khan academy en español" o algo muy parecido? Suerte, Alex
@ahmadkhaled9072
@ahmadkhaled9072 Жыл бұрын
imagine watching this vid 5 years ago..
@Poochester
@Poochester 14 жыл бұрын
you are amazing.
@amadeus_music
@amadeus_music 13 жыл бұрын
@khanacademy you said at 10:00 that M = mol/l. but isn't M = g/mol??
@Rusty2891
@Rusty2891 14 жыл бұрын
H3O is known as a hydroxonium ion aswell. Also H2O is not aqueous, it is a liquid. You can't dissolve water in water.
@NomsNomsNomsNoms
@NomsNomsNomsNoms 13 жыл бұрын
great :) didn't notice any mention of pKa? thanks you :)
@kemoi.m
@kemoi.m 8 жыл бұрын
Will those neon colours affect the eye
@sibtiali802
@sibtiali802 8 жыл бұрын
16:30....oooo now i know what pH actually means!
@kimmygobo
@kimmygobo 8 жыл бұрын
Thankyou so much for making these videos they have helped me so much! :)
@madlenlika4695
@madlenlika4695 13 жыл бұрын
Thank u soo much!!!u really helped me with this video.
@MrCordezzz
@MrCordezzz 12 жыл бұрын
Thank you for putting these great videos out.
@Rusty2891
@Rusty2891 14 жыл бұрын
@northlight72 Have you actually ever ready anything I put? I simply pointed out one mistake, and one other way of saying something. Your saying I am not helpful when people have said that I have been. I mentioned my masters degree as someone said that 'il understand better at uni', so i mentioned that i was already at uni and havent heard water as aqueous. I've never attacked the Khan Academy, even when he made a mistake. His videos are fantastic and helpful. And thanks for the career info :)
@dramaticsloth3012
@dramaticsloth3012 12 жыл бұрын
i like the video, however how can there be a hydronium ion when oxygen has a valency of 2?
@Madietastic
@Madietastic 12 жыл бұрын
OH MY GOD.....Thank you so much...
@BrandonPentz
@BrandonPentz 12 жыл бұрын
some can, just no one pays attention to what there saying, whereas, in this video, you do
@Phaze252
@Phaze252 12 жыл бұрын
Technically it should be (l) because the (aq) is as he said redundant and the OH- is called OH instead of HO because of tradition.
@crashonthehumble
@crashonthehumble 15 жыл бұрын
nice work
@sciencenerd7639
@sciencenerd7639 2 жыл бұрын
thank you
@digiconvalley
@digiconvalley 12 жыл бұрын
u r the best
@rawdonwaller
@rawdonwaller 12 жыл бұрын
@TheYo12343 Maybe 'puissance', as in puissance de Hydrogen? 'Puissance' is the French term for 'power.'
@heeheehoppsies
@heeheehoppsies 12 жыл бұрын
Thankyou so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so much
@BareClause
@BareClause 12 жыл бұрын
isnt h20 mean 20s and a 1 h because of the coefficient
@LeeJordanMusic
@LeeJordanMusic 12 жыл бұрын
Its funny how messed up the school system is here... I've learned more in about an hour than i have in 3 weeks in my chemistry class...
@azndude3600
@azndude3600 13 жыл бұрын
Why would water form hydronium? I don't understand it. Oxygen is already happy with its 8 electrons. Why would it get another proton?
@ewwxaca
@ewwxaca 5 жыл бұрын
THANKS
@Rusty2891
@Rusty2891 14 жыл бұрын
@WarpFieldTheorist Your a PhD student (guessing Chemistry) and you think 2H2O(l) ---> H3O+(aq) + OH-(aq) is wrong? I actually went out of my way to visit my Acids and Base lecturer to ask about this and he said that H2O is a liquid. What did I say that was critising the video? I pointed out 1 error and thats it. And calling me a Troll...well the less said about that the better.
@comedianmalyka2646
@comedianmalyka2646 4 жыл бұрын
this video came out when i was 8
@ZahdShah
@ZahdShah 4 жыл бұрын
I was 10 or something lol
@rawdonwaller
@rawdonwaller 12 жыл бұрын
Pedantic though it may be, does H2O's subscript (l) stand for liquid? I thought that aqueous phase means that the molecule or ion is surrounded by water molecules, in which case water molecules themselves are 'in' liquid phase (because it doesn't make too much sense t think of water molecules solvating themselves)? Of course, this is a superb video, and I may be wrong anyway.
@Eludinium
@Eludinium Жыл бұрын
So does this mean that water IS wet?
@KalimaShaktide
@KalimaShaktide 8 жыл бұрын
The link is broken...where is this video on the main site?
@hardikkardam6116
@hardikkardam6116 7 жыл бұрын
thanks , u r the best !
@MoonKnightBlack
@MoonKnightBlack 9 жыл бұрын
thanks
@musicajourney1643
@musicajourney1643 3 жыл бұрын
Thanks!
@1xtra299
@1xtra299 14 жыл бұрын
@WarpFieldTheorist & @northlight72: do you guys have any links that prove what youre saying? im all confused now... even my professor says that H20 should be a liquid
@ndawon1
@ndawon1 12 жыл бұрын
god bless you
@saher997
@saher997 3 жыл бұрын
Thanks alot
@lysafae
@lysafae 12 жыл бұрын
@Mrgamer4 Haha. Same here!
@chrysovalantistasiopoulos9987
@chrysovalantistasiopoulos9987 5 жыл бұрын
because the density of pure water is 1 gr/ml , and the molar mass of water is 18 gr/mol in 1 liter which is 1000gr the number of moles is 1000gr/18gr/mole = 55.55mole per liter, that is a constant value of the concentration of the water, so Kw=K*55.55M =K*[H2O] , this is the reason you never writing the concentration of the pure water in the denominator of the fraction of equilibrium constant . IT has nothing to do with probabilities !!!!!!!
@nasra9095
@nasra9095 8 жыл бұрын
Thank you so much!
@AshaunaByrum
@AshaunaByrum 7 жыл бұрын
Where is the next video to this series??
@northlight72
@northlight72 14 жыл бұрын
@Rusty2891 Honestly, if you are so concerned with being helpful, make your own video. But again, stop.
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