Solubility

[yatube12341]

I mean lets just be honest... you are the only reason I have an A in AP Chemistry

[TPBHvideos]

@TheBrad990 and my name is Brad too lol

[TPBHvideos]

@TheBrad990 so would everyone, but studying is more important than porn

[Ibanez3x]

Thumbs up if Ms.Hale-Hanes sent you here!

[snyderad92]

To understand solubility, and probably everything about the meaning of life, start the video at 1:15 Best analogy ever! Sal is the man.

[trallala]

@gingernigerr Well, O is in group 16 in the periodic table. This tells us that to fill its valence shell with electrons it needs to get two H+-ions, so an oxygen ion will have a charge of 2-. Sodium is in group 1, which tells us that a Na-ion will have one surplus H+, or a charge of +1. So you need two Na+ ions to "satisfy" an O2- ion.

[MrHamish108]

I'm at the weird part of youtube again,,,, jk studying for exams :/

[789123Y]

Thumbs up for the dog analogy

[crazystuffster]

that oxygen looks like a monkey face :3

[falpalemily]

The dog analogy was great! It made me laugh out loud :)

[JunkYardBuild]

@falpalemily Me too :)

[username961024]

Thanks so much, you're the best best best best teacher ever

[narcomanel]

Man, I keep forgetting everything every year, and this always helps me.

[DinoVideoman]

lol lol...

If this doesn't seem to dangerous

[diceman424]

My AP chemistry teacher made 2 accounts :P lolz

[artashes999]

Lol..... 1 here person had to give his dog away.

- Great video!

[dnrongo]

Wouldn't the intermolecular forces of Na or Cl cause the H-bondings to prevent from bonding with each other to make a solid since Ion-dipole bonds are much more effective as an attractor than a dipole-dipole or H-bond? isn't that the reason why freezing point is lowered? not because the Cl atoms are "in the way?"

[rsfighting1]

@leon89luvz solubility is a physical characteristic. Therefore dissolving is a physical reaction. Chemical reactions involve a new thing, for lack of a better word, resulting.

[leon89luvs]

Hi Sir, may i know when salt dissolves in water is it consider a chemical or physical reaction? I am confused because cause Na became Na+ and likewise Cl became Cl- so there is a break in Ionic bond. Help me please :)

Thanks!

[iduncare123]

are you the world's smartest person, or are u reading off a script. because even if you are, your diagrams and explanations are so damn helpful.

[JustmeKasie]

i absolutely love you!!! thank you for making this competitive world a bit easier to deal with :)

[lamalison]

Is it right that

when temperature increases,

solubility of solid increases,

but solubility of gas decreases?

[fandanstan]

@lamalison yes

[watdafact2]

i see 5 bears in a round Na+-table at 6:10

[narcomanel]

Eh, why is it that when you go to the right the atoms are smaller and smaller? Don't they just have the same level but just more electrons, how is that making them small?

[gargoyl173]

@narcomanel

The electrons are arranged in orbitals, for the elements on the left, these are partially empty. While the nucleus gains more positivity toward the right, the electrons are still in the same orbital, the extra pull brings them closer to the nucleus making the atom smaller.

[AzharKhan2011]

Thnx we have found that much useful

[GFreshMac]

This guy got me through my Introductory Biology Course and Calc 1... and now he's taking me through Chem. Sadly I learn more from him than the people I'm paying to teach me at a private institution...

[iainfriesen]

thank you! this is so nice.

[SoReaICru]

May I have a clarification? At 3:11 , Sal said the hydrogens bond of one water molecule bond to the oxygens of another water molecule but they're all moving around and make that shape. Are they bonded by Van der waals forces?

[coaxial]

haha imma let you finish but that was the best analogy of all time!!

[virginialikesyou]

You know, you have this amazing gift to put things into perspective for others. THANK YOU SO MUCH!!! Most teachers focus on one specific detail at a time when they teach, and don't paint the bigger picture of how we can see these things happening in our world so we can see them and understand them. Thank you for giving us a different perspective!!!

[virginialikesyou]

I *LOVE* the dog analogy HAHAHAHAHA!!

[33200]

so what happens in plasma?

[AgitoVersus]

so does the common ion effect apply to acids and bases?

[SoReaICru]

@AgitoVersus definitely

[thedeathskittle]

lol nice dog/doghouse analogy

[dtc1114]

the dog analogy had me crackin up forsure

[LemonDoesGaming]

Hahahahaha "I dont know if that analogy was at all appropriate" made me laugh so hard

[woohoorank1st]

molarity=the air* "molair" changes when you move, and it's pressure can change the volume(L)  helps me remember your reason for likeing molality better 2, and

molality=the owl* "molowlity" owls "kill" mice.... mol"owl"ity... "kill"ograms best i can do :)

[chickiebutt24]

really easy to understand, thank you so much :) very organized too !

[dmgab]

you're great

[5dsdouglas]

thanks again

[superrdg]

Thanks your videos are awesome and very informative. Also the way you explain is very easy to understand. ^^ thx again :)

[sjskla01]

When you say that higher temperatures increase solubility of a solid in a liquid, this is a generalization right? Because if the solution process of a some solid were exothermic, then wouldn't Le Chatelier's Principle suggest the opposite? In other words, you increase the temperature at equilibrium and the system responds in a way to undue your change.

[sjskla01]

If the solution process (solution on the right of the rxn equation) were exothermic (albeit a rare case), then the rxn equilibrium would shift to the left decreasing the concentration of the salt in solution right?

[Manbearpig8900]

Thanks!

[freezingbeast]

Na ATOMS are bigger than Cl ATOMS

HOWEVER

Na+ ions are smaller than Cl- ions....

When you take away an electron from Na, its electron cloud moves further closer into the nucleus. While the extra electron on the Cl moves it away from the nucleus

as a general rule of thumb, Anions are larger than Cations.

i think khan made a mistake on this one... :(

[mindauggas]

Na atoms are bigger than Cl because of the stronger pull from the nucleus in Cl (because there are more protons with + charge?) ?

please help me on this I'm not sure i remember it right...

[wasabisquishy]

Na is bigger because it has a lower electronegativity which means it has a lower ENC(electronegative charge) and so Na atoms have a less attraction to electrons.

Cl is smaller because the Electronegativity is very high and so is the ENC and so Cl closes in the electrons which makes the nuclues smaller.

[SteroidsR4success]

@mindauggas That sounds about right. Because there are more electrons in the outer most shell the Cls pull becomes stronger. Right because there are more electrons being attracted to the nucleus. I think the intuition that you are missing is just the fact that compared to the Na atom where there is only 1 valence electron that shell is less condensed compared to the Cl atom which has like 6 electrons that shell just essentially condenses its self even more because of the greater attrac.

[mahiou34]

great explanaton !!

[mateo0729]

what is this video about?

[IamaRTRfan]

Thanks a bunch for the video. Helped me a lot!

[182818anna]

i love this guy! he's fantastic. The analogy was more than appropriate

[phookadude]

Ahh it all makes sens now, Electrons are puppies.

[attilavirag]

According to my understanding, the sodium cation is smaller than the chlorine anion because after sodium gives up its electron to chlorine, the remaining electrons of sodium get pulled stronger by its nucleus.

[khanacademy]

You're right. I actually should do a mini-video on that because it's an interesting idea!

[JunkYardBuild]

@khanacademy Okay I was about to leave a comment about the Na being larger than the Cl. Looking at the periodic table you would think the opposite to be true.

You should put up a link to that video on this one.

[kenbobcorn]

@attilavirag thats incorrect its actually the more electronegative atoms such as chlorine that are bigger, and less electronegative such as sodium are smaller.

Also if it is an anion it growns bigger due to 1 less electron being pulled towards the nucleus meaning a stronger pull towards the center. Thus smaller atom as a result. Im a chem major so i know what im talkign about. :)

[attilavirag]

@kenbobcorn doesn't an anion mean that it is negative and therefore it has 1 more electron and not 1 less? It would be a cation if it has one less...

I am a chem major also...

As neutral atoms sodium is bigger than chlorine. As charged species, the sodium cation is smaller than the chlorine  anion

[kenbobcorn]

@attilavirag in a neutral state sodium is always bigger than chlorine on that you are correct. What most people do not realize is that even an halogen or noble gas can be bigger than a Na+ cation if it has gained numerous electrons. A great example is that O 2- with a radius of 140pm is actually bigger than a Na+ atom with a radius of 99pm. And yes an anion means it has one more electron that was an accident on my part. Just wanted to clear some stuff up and help the viewers a bit.

[lizhichengren]

@attilavirag I totally agree! There's still one more reason why the sodium cation is smaller than the chlorine anion. After giving up electron, sodium cation now only has 2 shells (instead of 3 as it used to be), this makes it a lot smaller.

[pmip247]

awesome analogy in the beginning, made me laugh :D

i really enjoy these videos.

i might have to make a video to help you out with winning that $50k !