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!
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. :)
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 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 :)
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.
@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."
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 .......
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.
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 ???
@The19thKey g/liter= density to get the molarity(M) you need to convert grams to moles. Molarity= mol/volume Volume= liters or millimoles/milliliters. =)
@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..
@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).
@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".
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?
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 RUclips que se llama "Khan academy en español" o algo muy parecido? Suerte, Alex
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.
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:))
@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 :)
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
@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
@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.
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 !!!!!!!
i once had a friend and he learned something from your videoes and now he is in harvard.
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!
Not all heroes wear capes
Haha you win
Some wear hoods
Some teach chemistry physics mathematics economics and much more
khan is a good hero
@@gandiaulaad1155 so we are all heroes nowadays.. right? 😃
sals pickup line:"let me switch colour"
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. :)
No MCAt just regular ol biology 🧬 online at that
"of course water is desolved in water" :D
Anyway, you're my science-hero
Is this really how simple this pH pOH thing is? My lecturer explained this in a really complicated way. Thanks a million. Great work!
My friend got accepted in Harvard with the help of your videos, true story.
We should use (l) for H2O indicating it is a pure liquid, not (aq)
I'm in 4th semester at university and I still struggle to understand the basic concepts. Thank you khan academy.
+1,000,000,000 for color-coding! It's extremely useful for organizing information!
@splitecho Oh, Sweet! I'm using these videos right now for GAMSAT (Australian MCAT).
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!!!
Can we get an update on where you are now?
@@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 :)
it shows you up the top of this page on the right hand side
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.
+Darius Fullmer Yep, was just about to write this; essentially this is screwing up a lot of stuff lol
@The19thKey M represents Molarity, and the molarity is found by Moles/Liters of solvent, in this case water.
Thank you for successfully teaching me a single concept in 3 mins that my professor failed to in 3 lectured :p
You're the reason why I won't fail my test :D Thank you so much!
me too
Giulia Depo
@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."
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 .......
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.
8:19 of off.. I ain't off untill I watch this video fills my heart.😊
seriously i learn so much just by watching your videos there's no need for reading anymore! it's kinda funny XD
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 ???
Thank you so much! Your explanations are so clear and easy to understand. You make super chemistry fun! :D
I’m in biology why am I doing chemistry??
@The19thKey
g/liter= density to get the molarity(M) you need to convert grams to moles. Molarity= mol/volume
Volume= liters or millimoles/milliliters. =)
why is the option to increase the play speed removed?
@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..
SoI have taken years of chemistry and NO ONE ever explained what 'p' was! Thank you!
Thank you so much Sal Sir, your videos are helping me a lot.
This video was really helpful. You should have a comment section on your website so that students can give you feedback. Thank you!
You're cute.
Thanks khan, as countless of them you could receive, each one is meaningful. Especially
@christyc463 I think I found out. I think its a form of intermolecular forces and in this case its ion-dipole attraction.
azndude3600
i wish i had found these vids while i was taking gen chem! so helpful and clear!
very helpful. this is something that is going to save my grade
Thanks Sal Khan, youre a legend among men
@The19thKey Molarity is mole/liter
@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).
Thank you for explaining, in simple terms, what all this means.
i will never ever forgive my year 11 and 12 teachers
hamed alimoradi
Me
i hate my high school teacher more than everyone that pisses me in the past
@@That_One_Guy... can you please shutup?
@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".
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?
ooooooooooh my wooooooooooooord! absolutely love this vid's. going to save my (academic) career! thank you so much! :D (grinning like a boss)
THANK YOU SO MUCH. I WAS SO LOST WITH ALL THE EQUATIONS AND EVERTHING
thank you khan really helped me understood the topic
You made this chapter easy...thanks!
@splitecho : woah that's amazing! nice going! what else really helped you do so well?
@TheYo12343 Maybe 'puissance', as in puissance de Hydrogen? 'Puissance' is the French term for 'power.'
you are soooo freaking amazing. like everything just makes sense to me now.
you are a god
Gracias por los subtítulos!!!
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 RUclips que se llama "Khan academy en español" o algo muy parecido?
Suerte,
Alex
imagine watching this vid 5 years ago..
i like the video, however how can there be a hydronium ion when oxygen has a valency of 2?
@khanacademy you said at 10:00 that M = mol/l. but isn't M = g/mol??
you're amazing.
Thank you very much!! i was soo confused. Now i understand how this work! yay!!
How many subscribers he had at that time??
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.
So does this mean that water IS wet?
jazakaAllahu khairun
Thankyou so much for making these videos they have helped me so much! :)
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:))
Will those neon colours affect the eye
Why would water form hydronium? I don't understand it. Oxygen is already happy with its 8 electrons. Why would it get another proton?
Shouldn't water be (l) instead of (aq)?
only pure water can be (l). (aq) water means there are impurities in it.
***** There should be pure water on the left side of the equation. aq means dissolved in water. Water can't be dissolved in water.
It can
of course you are Indian...cleverest people in world...:)
H3O is known as a hydroxonium ion aswell. Also H2O is not aqueous, it is a liquid. You can't dissolve water in water.
Sir, you have just offered a big big help !!!
Whoever you are, someday I want to meet you and shake your hand. There's nothing you can't put in understandable terms.
@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 :)
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
Thank u soo much!!!u really helped me with this video.
great :) didn't notice any mention of pKa? thanks you :)
Damn, you leave no room for ambiguity.
I like that.
isnt h20 mean 20s and a 1 h because of the coefficient
16:30....oooo now i know what pH actually means!
Flawless explanation =D
The link is broken...where is this video on the main site?
How do you get those concentrations? or where do those concentratons come from? what's the math behind it? thank you.. still the Video is 4.5 stars
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
Thats a great score! What else did you do?
Austin Friswold
@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
p stands for "Potentia Hydrogenia" (Potential Hydrogene Force)
Where is the next video to this series??
@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.
@Mrgamer4 Haha. Same here!
thank you
Doesn’t the “P” in pH stand for potential?
Yes, it does 🙂.
THANKS
you are amazing.
thanks
OH MY GOD.....Thank you so much...
Thank you for putting these great videos out.
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.
Why is the concentration of H2O is 1? I still don't get it
Thanks!
Thanks alot
some can, just no one pays attention to what there saying, whereas, in this video, you do
u r the best
I finally understand this!!!
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 !!!!!!!
thanks , u r the best !
Thank you so much!