It is sad when I learn more from this video than from my professor that I pay very expensive tuition for. Thanks for the help
@NatsuDragneelBC
8 жыл бұрын
the hand gestures are oddly satisfying and helpful....
@chemistNATE
11 жыл бұрын
Took me a while to figure this out when I started learning chemistry. It's because it's a "Bronsted-Lowry Base" ... it creates OH by stealing an H+ from water. It does not simply give off OH- ions ... that would make it an "Arrhenius Base".
@adityamisra7702
3 жыл бұрын
Thank you very much , got a , much needed way to solve such questions .
@gracewhiteshark
4 жыл бұрын
Thank you SO much, I hope you know that you're amazing and truly truly helping tons of people and I really appreciate you and this work!
@salsaplease
8 жыл бұрын
you should probably not be asking your students to "satisfy your desires" hahaha
@mountassaralimi8884
8 жыл бұрын
salsaplease so true that was cringeworthy af.
@michellebatliner8509
6 жыл бұрын
I clicked on the video and within the first 10 seconds I was dying bc he said that
@Kencan254
4 жыл бұрын
Especially when he says, " if you are in Toronto, send me a message". Let give him benefit of doubt. He probably meant, we like and subscribe to his channel.
@crystalkadletc1944
3 жыл бұрын
Lol
@madisondyer1472
8 жыл бұрын
OKAY LITERALLY THE MOST HELPFUL VIDEO IVE SEEN ALL DAY SO MUCH BETTER THAN STUPID CRASH COARSE GO NATE!!!!!!!!!
@dem0ninthemist
9 жыл бұрын
I liked the method but I think doing the hendersen formula would have been better to avoid quadratic part
@kamatmehbro
10 жыл бұрын
its faster, to just take the -log (kb)=pkb.. then used pOH=pkb+log [(BH+)/(B)]. Since the volumes are the same.. the ratio is the same, so you can simply sub, 0.018 as BH+ and 0.012 moles for B. Plug and chug to give you p0H=4.92. Then finally, pH=14-pOH. Thus, pH=9.08. Way faster :)
@lionelcrawford4562
10 жыл бұрын
Haha I was just about to bring up the same thing. I feel as if the method you mentioned is way less confusing.
@YoungTwam
10 жыл бұрын
You just saved me so much time. I wonder why they just don't show us that way from the start
@kamatmehbro
10 жыл бұрын
^haha I'm glad I could help :)
@TheAcidr31gn
10 жыл бұрын
Daron Palmer They dont show us this at first because without the Ka or Kb equation we do not have the Henderson-Hasselbalch equation =P.
@Georgiaboy_
9 жыл бұрын
Why must you find pOH first and not pH? I need an answer kind of fast because My test is tomorrow.
@KSWriter82
11 жыл бұрын
It literally took me three hours to find the pH to a similar problem as this, until I saw this video. You, my good sir, are a god among men.
@deshanperera2729
4 жыл бұрын
Lol, you teach me a lots of things than my 2 and a half years of chemistry tutions. Great work sir. You earned a sub
@TravelWithTea8
9 жыл бұрын
In my chemestry book, they just write (0.064) times (x) divided on (0.04286). Why don't they use the x in (0.064+X) and (0.04286-X) I don't get it? Is this also correct?
@dananabulsi
8 жыл бұрын
+Top 10s It is correct, but that value of x is so small that counting it won't make a difference on the answer, so it is ignored.
@JAWMpb
11 жыл бұрын
Thank you so much! My chemistry teacher is flying right through everything before the AP exam and I really needed to see this video to understand what is going on.
@kimberlyzomb13
11 жыл бұрын
I have an exam in three hours, and this was the part that was going to bring my ultimate demise. I would buy you cookies, your explanation was waaay better than anything my professor could explain. THANK YOU SO MUCH!!
@sameterden1161
Жыл бұрын
hi how are u
@ThePOWEROFSARCASM
9 жыл бұрын
You made my first year of uni a breeze, thank you! also Toronto represent!!
@apvadaparty
10 жыл бұрын
The little explanation in green around 4:40 was so helpful! I always wonder about why the Cl becoming HCl again doesn't affect pH....I get it now!
@OShawna23
2 жыл бұрын
Thanks for helping me study for the MCAT ❤
@kibavaria
9 жыл бұрын
You should be a professor at UofT!!!! Seriously! My chem prof is reeeaaally bad!
@snehasarmah9999
5 жыл бұрын
Sir, what if we have equal concentration and volume for both, the acid and the base?
@AngelA-bb5jl
9 жыл бұрын
Thank you so much bro, I have a final on Tuesday and this topic was giving me trouble. You did what my professor couldn't do in two classes which totaled 6hrs.
@diegocano9653
11 ай бұрын
YOUR AMAZING 10 YEARS LATER AND YOUR STILL AWESOME THANKKKK YOUUUU🎉🎉🎉🎉🎉🎉🎉🎉🎉
@jinglemich4941
7 жыл бұрын
Video might seem too long and oversimplified, but every single thing he says is *very* important and could save someone for making a bad mistake.
@TheIamwalruss
10 жыл бұрын
You can use the Henderson-Hasselbach. You already have Kb which you can use. Same answer.
@Mohajami1
11 жыл бұрын
How do you know that NH3 reacts with water, and not NH4+. Thanks.
@TinCarpter
11 жыл бұрын
if the equilibrium constant is smaller than 1.0x10^-3, then any change that is not from zero is considered insignificant.
@alyannaasumen222
10 жыл бұрын
Where did the 0.28 L come from? The one he used to divide in both the initial moles of NH3 and HCl which are 0.012 and 0, respectively?
@OpenThoughtProcess
2 жыл бұрын
total mL of volume in the solution converted to L
@greciar471
6 жыл бұрын
Thank you for this!!!! I didn't understand how to do acid-base titrations until I watched this video!
@priyadarshinighosh6461
7 жыл бұрын
Thanks for clearing this concept so nicely , sir.
@aliyashafi9945
7 жыл бұрын
Been watching your videos since grade 11 and you're still here helping me in 3rd year Biochem at UofT. 😂🙌
@phalguninandakumar7324
10 ай бұрын
why did you react nh3 with water? is it just so we can use kb?? idk where the water came from and how that helps up with how nh4+ contributes to the ph
@Bouzoukiellas
8 жыл бұрын
Wouldnt NH3 and NH4 act as a buffer solution? Could you use the HH method to calculate pH?
@joshlowery4503
6 жыл бұрын
Hi TomatheGreek, sorry this is so late but I'm assuming you are referring to the Henderson-Hasselbach equation. You are correct. You can use the Kw and the Kb to solve for the Ka. Take the antilog of the Ka to get the pKa, then take the concentrations of the NH3 and NH4 that were calculated and reach the same answer. Hope that helps.
@JohnSmith-nq1zg
10 жыл бұрын
thanks can't tell you how much you're helping me through AP chem! :)
@victoriaacheampong7105
5 жыл бұрын
I have a test tomorrow and I still didn’t understand but this helped so much
@traviscoleman8332
8 жыл бұрын
You could have skipped the ice table at the end and went for the henderson hasselbalch equation right?
@juliedothething
7 жыл бұрын
Redid it using Henderson and works out the same
@MarkManuel15
9 жыл бұрын
What if it's beyond the equivalence point, and you're left with HCl and NH4+? Which one is going to affect the pH???
@NieDamSuba
9 жыл бұрын
Generally both. However I was taught, that when amount of H+ ions coming from HCl is at least 100 times higher than amount of H+ ions coming from hydrolysis of NH4+, you can neglect the hydrolysis reaction.
@AlejandraAcunaa
5 жыл бұрын
How do you know what NH3 will affect the pH and HCl will not?
@valerieb5384
11 жыл бұрын
what happens when the n of the strong acid (HCl) is more than the n of the base (NH3) so it goes to zero with the acid leftover? whats the Kb formula (product/reactants) then?
@xRevster97
11 жыл бұрын
Why do you have to divide by 280 and not 180 and 100 respectively...?
@rumikhuwaja8708
7 жыл бұрын
how come the nh4+ from the first equation doesnt react with water as well ?
@tinaxia1144
6 жыл бұрын
You don’t have to find the concentration in the second to last step bc they are out of the same volume
@Anuj-tiwari
7 жыл бұрын
what will happen if concentration as well as the volume of acid and base are same.. like.. 0.4M of 100ml of NH3 + 0.4M of 100ml of HCl.
@DantesTalks
11 жыл бұрын
They react fully leaving only NH4^+^ and Cl^-^ does that mean the NH^+^ ions would react with water to produce hydronium ions and making the solution acidic?
@DantesTalks
11 жыл бұрын
So.... what if the same volume and same concentration of NH3 and HCl (same moles of each) are mixed together, how would you measure the pH?
@Saturn1444
6 ай бұрын
THANK YOU SO MUCH YOU HAVE NO IDEA HOW MUCH YOU HELPED ME
@abefromansausagekingofchic6480
7 жыл бұрын
Semi-confused. Since HCl is a strong acid and it dissociates completely in solution, then wouldn't its starting moles be 0, and Cl-'s (and H+) starting moles be 0.018?
@abefromansausagekingofchic6480
7 жыл бұрын
Also, how do you know if you use the Ka of the acid or the base.
@justinlee2300
8 жыл бұрын
In my class, we solve these titrations by using the HHB equation, and instead of using HCL, we use H+. The equation we would use is NH3+H+=NH4+. Then we solve for the concentrations. :] good video!
@PirateFunk
10 жыл бұрын
Thank you based chemist.
@PokemonGangsta011
11 жыл бұрын
How do you find the pH of a mixture without being given ka?
@ebsmith1102
8 жыл бұрын
why is the first that pops up when I search for a strong acid/strong base reaction?
@m.rebotilemachika8637
5 жыл бұрын
why did you use 0.28L as your volume on the second ICE table?
@Studio-nn3do
5 жыл бұрын
Because that's the volume of both NH3 and HCL which he needed no calculate the concentration of both (this did not include the water used in the second part because it was irrelevant to the equation. (Irrelevant because 1-- we assume that we have enough water to have the remaining NH3 react, and 2-- we don't want to have the water interfere with the important 'theoretical' calculations to find the pOH of the remaining solution with minimal water *in a more realistic scenario, the water would dilute the 2nd solution if we added excessive amounts which would throw off the pOH and subsequently the pOH) tl;dr We want to find the ideal (highest or lowest) pOH of the solution. That's why we only measure the concentration of NH3 and HCl against the total volume of themselves and only themselves Hope this helps, let me know if I'm missing something or wrong. Edit: 0.28L is the same as 280mL which is the combined volume of NH3 and HCl
@metaltrash0339
6 ай бұрын
genuinely very helpful, thank you for posting this
@TheresaReesaNjoko94
11 жыл бұрын
my test is tomorrow...was feeling so nerves but now im okay. thanx sooo much:) xoxo
@zombeecapreeclimber
9 жыл бұрын
I think X=2.7 x 10^5 NOT 1.8 x 10^-5 ??? am I right or wrong?
@nmr6998
9 жыл бұрын
www.odobli.com You are wrong. X=1.2E-5
@TheChelmick
11 жыл бұрын
what happens when i have amounts that go to completion. I get 0 moles of HCl and NH3 after the reaction leaving me with just NH4+
@Ladydhere
11 жыл бұрын
how can i just know like that which ones affects the PH?? is there no other way to find out which moles are left
@marlobarrera7981
7 жыл бұрын
What if they have different concentrations who's mole will be minused?
@Moshingrobot
8 жыл бұрын
I wish you would do a video that had you figure this out with fractions and ratios instead of the ice table or whatever.
@damianlily
9 жыл бұрын
I don't think your answer is right. I am coming up with pH of 5.22 when you have weak base with strong acid, pH would be less than 7 not greater 7. And also reaction of weak base with strong acid would yield acid salt.
@NieDamSuba
9 жыл бұрын
Right, but notice that here, after the reaction, there is still a lot of ammonia remaining. That's why the solution is basic. If there was only salt in the solution, your result would be correct.
@damianlily
9 жыл бұрын
NieDamSuba Thanks
@kristinscott94
10 жыл бұрын
the hand gestures were kinda distracting. but very helpful. also instead of doing the second ice table, you could use the Henderson-haslbach equation. pH=pKa + Log (base/acid). you already have the initial concentration after completing the first ice table
@Lexyvil
8 жыл бұрын
Amazing explanation~ If I have a problem where it's 1 mL of 6M HCl mixed in in 9 mL of H2O, water, does the concentration of HCl change based on the final volume of the mixture?
@5abijattz1
7 жыл бұрын
Nate my man, taught me better than my teacher
@yodestinaetion
10 жыл бұрын
can this be solved without the kb or ka?
@stephr9175
7 жыл бұрын
could we use the henderson hasselbalch eqn for this?
@DieIngwer
11 жыл бұрын
Why is it an equilibrium reaction? With a strong acid it's always a net forward reaction, isn't it?
@gator746
8 жыл бұрын
how did you go from NH3+HCL TO NH4+OH-, WHERE DID THE OH CAME FROM?
@overduekey
8 жыл бұрын
+Khoa Dang Nguyen Because NH3+ is a base, it will accept a hydrogen. Hence H2O donates its proton to NH3+ and will become OH- on the right side of the equation and NH3+ will gain a hydrogen thus becoming NH4+. Make sense?
@gator746
8 жыл бұрын
let say the number of moles and acid are equal, what happen to the Ph? Is this gonna be 7?
@joshuayang42
8 жыл бұрын
+Khoa Dang Nguyen I think it has to do with how many moles of the acid or base is hydrolyzed. The pH of a titrated strong base with a strong acid and vice versa will always be 7 because all of the strong base/acid dissociates, cancelling each other out. Please correct me if I'm wrong!
@CarebearCU
11 жыл бұрын
Can we assume that the Ka is 1.8*10^-5 if the Ka is not stated?
@MynamedidntFitDonkey
10 жыл бұрын
Kb differs for the different bases its 1.8*10^-5 only for amonnia
@ramchop-_-7320
4 ай бұрын
All the other teachers just do “HCl + NaOH” which pisses me off cuz I never learn how to do weak acid and base with limiting reactant involved, so thanks
@syazwanihussein9488
2 жыл бұрын
What if it's comes with different ration????
@MrOllieb27
8 жыл бұрын
So my question asks what is the pH when they're both in equal amounts and concentration.
@breadgenie4021
2 жыл бұрын
7
@SagarKharaluniverse
8 жыл бұрын
significant digit have to be taken into account i believe
@blythe9483
Жыл бұрын
thank you! this is the most simple explanation i can find
@modhasamir
11 жыл бұрын
you are the best. I wish my chem prof could teach like you..
@paulmann2716
10 жыл бұрын
I liked your video, thanks very much. One minor suggestion would be if you could write the units after each number, that would be really helpful. Thanks a lot - you are a good explainer.
@zachpetrolia2097
8 жыл бұрын
Have to have Cl2 when you break it apart so this is wrong i think
@abisugiri
11 жыл бұрын
why do you need to add H20 to NH3??????
@WadeSmithAcoustic
12 жыл бұрын
You're really great as a teacher!
@fatimarahimi0861
9 жыл бұрын
You're my favourite Chemistry youtuber
@sohoyankee66
7 жыл бұрын
I'm looking for a video that takes pH and finds the concentration.
@thatnaman
7 жыл бұрын
please post a video involving ph of strong base and weak polyprotic acid.
@TrevorSchmahl
9 жыл бұрын
You are in Toronto? Where about? Do you tutor? How much when and where??!?!??!1 Chemistry 110 at UTM is kicking my ass right now!! HAALP :) Great videos BTW!
@raesk1618
6 жыл бұрын
Thank you sir seriously keep it up your the best better than my own teacher.
@VasileSurdu
10 жыл бұрын
you sir are amazing.! tnx for explaining this simple
@sicilianotoronto
5 жыл бұрын
Can you also use the Henderson-Hasselbalch equation for the last step? Thanks!
@chemistNATE
5 жыл бұрын
As long as you've added more moles of NH3 than of HCl, you can use Henderson-Hasselbalch. Toronto Represent !
@randallp4198
4 жыл бұрын
@@chemistNATE When using the HH equation approach, how come you don't need to calculate the partial ionization of the NH3 (weak base) to NH4+ before you react it with the HCl. Is it because the problem states the solution already has 0.3M NH3 and 0.1M HCL in it, the problem doesn't talk about adding the 0.1M HCL to the 03M NH3, or am I missing/overthinking it.
@detefonusa
11 жыл бұрын
Do you have a video explaining how to get the pH of this kind of titration (strong acid/weak base) on different stages? (before any acid is added, after some acid is added, during the equivalence point, etc). Thanks. BTW, your videos are awesome!
@klaaphimuk
11 жыл бұрын
You should come to Thailand,Thammasat University always welcome u.Our chemistry professor taught us so poor !
@AshwiniPatil-hi1nb
5 жыл бұрын
What if we use 0.3N NH3 & 0.1N HCl
@romaximee
11 жыл бұрын
THANK YOU!!!!!! you get very happy when you understand the problem
@jollyjokress3852
8 жыл бұрын
I love the feltpens! Colours!
@micahtabanfar2543
9 жыл бұрын
shout out from UCLA Organic Chemistry Lab! So helpful
@madisondyer1472
8 жыл бұрын
thank you so much for satisfying my chemical desires. I think you have great chemistry
@maicolgarzonmelo7033
7 жыл бұрын
Thank you a lot man, i really understood, but i saw this video too late, cause I've had an exam of this T-T , new sub!
@Bookie005
10 жыл бұрын
You are the best!!! Stay blessed!! 👍👍👍👍👍👍
@cooperscoles1438
9 жыл бұрын
I got 9.44 using the henderson hasselbach I was just wondering why this might be?
@gabriellewilson3935
9 жыл бұрын
Cooper Scoles the henderson hasselbach equation is only valid within the buffer region, not during the equivalence point !!
@cooperscoles1438
9 жыл бұрын
thank you I realized that right after I posted the question haha
@samhernandez551
9 жыл бұрын
Cooper Scoles I realize this was two months ago, but I actually got 9.07 using the HH equation!
@tigersfan3411
5 жыл бұрын
are you canadian?
@mojden5452
11 жыл бұрын
What if there is no kb or ka given???
@todayiglowup4286
5 жыл бұрын
can someone explain where the h2o came from
@chemistNATE
5 жыл бұрын
When you mix NH3 with HCl, I guarantee they aren't pure; they're dissolved in water. And the water is going to play a role in the chemistry of the reaction. NH3 reacts with water to make NH4+ and OH- ... HCl reacts with water to make H3O+ and Cl- ... H2O is always there playing a role.
@kostasgio6480
9 жыл бұрын
you really use H+ instead H3O+ ??... So weird....
@laravencharde5614
5 жыл бұрын
The hands are everything.
@mdk124
11 жыл бұрын
Hey man i really appreciate your video! Helped me a lot man thanks ^^
@The120053
10 жыл бұрын
But a strong acid waek base reaction isnt an equilibrium. ....at least that what my teacher told me.
@MarkManuel15
9 жыл бұрын
This is not the equivalence point, this is after some HCl was added.
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