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Worked example: Determining solute concentration by acid-base titration | Khan Academy

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The concentration of an acid solution can be determined by titration with a strong base. First, calculate the number of moles of strong base required to reach the equivalence point of the titration. Then, using the mole ratio from the balanced neutralization equation, convert from moles of strong base to moles of acid. Finally, divide the number of moles of acid by the given volume of the acid solution to find the concentration.
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Опубликовано:

22 авг 2024

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Комментарии : 152

@AmineChM21 9 лет назад

Gotta love khan academy helping so many kids all over the world

@edream2513soccer 7 лет назад

When you learn nothing from college and everything from khan >

@Peter_1986 5 лет назад

I passed an entire exam in Differential Equations just by watching Khan Academy and reading the ODE sections on Paul's Online Math notes, lol.

@jaredmorales9763 4 года назад

Laurelindo exactly school just makes us pay to receive a test and watch khan academy and re-learn material , that’s it !

@exelsius4442 3 года назад

@@jaredmorales9763 we only pay universities and colleges for a piece of paper that says that we graduated :/

@relaxingandedits5340 3 года назад

Bananas

@peterfarrow8021 6 лет назад

life hack: put Khan Academy on 1.5 speed and they talk like normal humans

@caesium_ 3 года назад

thank you. :)

@relaxingandedits5340 3 года назад

Lanati

@relaxingandedits5340 3 года назад

,💩

@nurlybektoktarov469 2 года назад

😅😆

@Qubit313 2 года назад

😂

@kimberlyhaynes9389 6 лет назад

You have no idea how long I've been struggling with this. Then in less than 10 mins you help me understand make me happy to be doing chemistry again. Thank you.

@diane3094 7 лет назад

I didn't know this was easy, Thank you so much 😁

@relaxingandedits5340 3 года назад

Potato 🍠

@SKC_Digital 7 лет назад

Thank you so much for this! I would have done so badly on my chem test otherwise

@KunaiKrazy 5 лет назад

I watched these videos for all of my Chem 2 class because my teacher taught me very little and I had to teach myself. So glad he gave me a pity C.

@relaxingandedits5340 3 года назад

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@harshithavenkateswaran7034 2 года назад

lol what happened to me so I wouldn't fail 😂

@seantyexdee 5 лет назад

ap chem exam tomorrow and this really saves my life

@relaxingandedits5340 3 года назад

Trump

@shivrammohan9081 4 года назад

You are saving a lot of Indian kids

@n.sambedprakashpati3271 6 лет назад

its not that we multiply by two in every question the real shortcut is= normality *v1=normality *v2 and normality=molarity * n factor

@sabreadillard168 8 лет назад

Yay I finally understand titration :D just in time for chem final today at 7 :D

@butterfacepilot 5 лет назад

Sabrea Dillard same situation here :D

@Peter_1986 5 лет назад

Here is the general equation for this kind of problem: *C*V/B = c*v/A* The variables C, c, V and v are the concentrations and volumes for for HCl and Ba(OH)₂, and B and A are their number of moles.

@Princ3Shun 8 лет назад

(Number of H+)MV=(Number of OH)MV wouldn't it be easier to understand?

@scarlettkelley-hhs2472 8 лет назад

+Shun Prince That is what I teach my kids too! Not confusing to them at all if they understand that!

@adittyamittal4090 8 лет назад

Yeah or just simply say MVx 'n'Factor

@superemepwr 6 лет назад

Jay was too busy making his voice higher

@user-ef4fn3rg2h 6 лет назад

Shun Prince okkk very god

@user-ef4fn3rg2h 6 лет назад

Shun Prince number H3po4 is.........3H

@muzzammilsajid 3 месяца назад

You could use: MV/n = MV/n n being the moles you obtain fron the balaced chemical equation.

@edenhazard7971 7 лет назад

Yeah, I have an a level chemistry exam tomorrow. Defo failing

@shadowrayTV 5 лет назад

did you fail?

@neyo231 4 года назад

we need an update fam

@joezetts8373 4 года назад

so how did it go

@adriancoleman2876 8 лет назад

and us big kids.

@AhmedEl-Gazzar 7 месяцев назад

you can just calculate the normality of Ba(OH)2 to be 0.0308 then using (N*V)=(N*V) to solve for HCl Normality by (0.0308*27.4)/20 = 0.042196N which is also the Molarity as Valency equal to 1

@simeonsechrist8600 6 лет назад

If you are doing this for chem class make sure that you check with your teacher if the short cut is ok. I learned the hard way :)

@sarahholland5980 7 лет назад

Thank you for saving me for my test tomorrow, I was staring at my notes and I was so confused!!

@eco.3977 5 лет назад

Thank you Khan Academy for helping me learn things the public education system didn't give an f to teach me

@faridb40 6 лет назад

Excellent video! Really helped me for my exam!

@deepjiwan5500 5 лет назад

Hey...in the 'shourtcut method' using mole ratios does the trick... To say; Ma×Va = Na --------------------------- Mb×Vb=Nb Where; Ma is molarity of acid Mb molarity of base Vb volume of base Va volume of acid --------- means divide lol Na number of acid (from ratio) Nb number of base (from ratio) Thanks for the video great Hope i helped with my formula

@benkrauss5041 5 лет назад

It took me half an hour to find a video for what I needed. Thank you so much!

@jerrykarl9667 3 года назад

Very clear and easy to understand because of the way he illustrates and explains.

@ibrahimh.2828 8 лет назад

Aren't you supposed to divide by the total volume? Or is that just when you are solving for the pH of a titration..

@Laura-qx5je 8 лет назад

thank god for this video!! Finally I understand it

@relaxingandedits5340 3 года назад

F off

@simonloos2092 4 года назад

How did you get the BaCl2? Im confused on where the 2 came from and Ive watched 10 times

@butterfacepilot 5 лет назад

Great video, understood it all with my very tired brain, the night before my exam

@JasonSmith-ot4zd 6 лет назад

when you round up the volume for both using the shortcut way and multiply that by 2 you actually and then divide that by the conc of de base you actually still get the same answer too

@JasonSmith-ot4zd 6 лет назад

That's why you always need to balance the equation before calculation

@diya9707 7 лет назад

Best ever video on titration!

@marygracebuni4575 3 года назад

I shouldve just paid khan academy my 2020 tuition

@nismadahal4318 4 года назад

Thank you and that was easy which I did not think of

@Eric_Nguyen. 8 лет назад

What if you are given V1 and VH20 as a base what if they tell you to calculate M1 and they give you an mL and 0.13M, but that is all. They only give you NaOH and nothing else. They give you the volume and on NaOH and nothing else.

@Samora-rz1fk 6 лет назад

Thx got a test tomorrow!!!

@dorrinsotoudeh7631 7 лет назад

What if u use Acid. Base MVn=MVn n: stochiometry number of acid and base

@UnL1k3 8 лет назад

Thanks! I can finally understand titration

@cyphatmaudzu1995 2 года назад

Am really desperate of this stuff .... going to have end of semester exams tomorrow

@ItzMoZay 4 года назад

really good video, however i did not understand how you changed the answer when you divided M by the L. and changed the whole number without explaining.

@jairuslirazan6317 7 лет назад

Fucking analytical chemistry being a pain in the ass and the subject the keeps my GWA from getting high

@johnespellarga6126 4 года назад

Do you do the same if you find the molarity of base?

@bartek4536 3 года назад

Well explained thank you. C1V1 = C2V2 always for me. Just account for the ratio at the end. And what`s the problem with that I don`t know.

@nathanielsabtoe1657 Год назад

yeah the ratio kinda confuse me

@prxnv 4 года назад

I don't understand how Barium Hydroxide has molarity/concentration of 0.0154 M. If its just by itself and not dissolved in anything, and calculating molarity requires solute and solution, what did he do to find molarity?

@michellec.4291 6 лет назад

Thank you Khan Academy !

@menandtheirmoney7135 3 года назад

shouldent the volume be in liters for the mv=mv calculation

@Berghiker 2 года назад

@5:43 Is that 2.11% concentration of HCL or 1.5% may be correct?

@plasmatic5593 3 года назад

fk chemistry, but thanks to you I understand a bit lol

@dishango74 6 лет назад

why in earth will someone dislike this??

@454shrihanwalawalkar4 7 лет назад

awesome vedio but could be easy if you use simple values

@parth19930 7 лет назад

i love your videos......seriously!!!!

@Mayacocoice 4 года назад

saving my life thanks

@shantiazizian3574 2 года назад

love your videos mate

@nicholashaynes3483 3 года назад

Don't have to take into acct that Ba(OH)2 produces 2 equivalents of OH?

@kerenelvir6805 8 лет назад

Well, on the first problem it's moles over liters, not milliliters.

@xenomads 5 лет назад

Thank you so much

@bhushangayake2840 8 лет назад

"What volume of 1.00-molar ammonium chloride must be added to 1.00-liter of 0.100-molar LiOH in order to achieve a pH of 9.4? " Please help me with this

@xvixii3657 4 года назад

When the question says 'concentration', does the concentration refers to the 'mole' or 'molarity'?

@salmanmahyuddin8384 3 года назад

molarity i think

@Nicolle0sakura 6 лет назад

very helpful!! Thank you.

@YoussefMohamed-mf9fc 3 года назад

Dating?

@wmd222HxC 5 месяцев назад

Would someone help me find a way to convert molar to percent?

@emma-ts1eg Год назад

2:08 how did u know Ba was 2+ and Cl was 1-

@madelinewilliams5515 5 лет назад

YAY! so helpful!

@sb6512 5 лет назад

Thank you!!!

@relaxingandedits5340 3 года назад

@flawns 8 лет назад

isn't this just stoichiometry

@Boristien405 7 лет назад

U WUT M8? - There are two methods to solve titration, one being stoichiometry (the first way) and the second is using the "shortcut" equation that he used at the end.

@nischay4719 6 лет назад

Yep the concept behind titration is indeed stoichiometry.

@yahyagh1020 5 лет назад

@@Boristien405 the third method is by using dimensional analysis

@omnimatt2239 6 лет назад

If you use the "shortcut" don't you just add in moles to the equation on each side?

@RUSALOSA 3 года назад

what if I don´t have ml for the acid?

@shahab8052 5 лет назад

Thank you! This is amazing👌🏻

@relaxingandedits5340 3 года назад

,,🌚

@TheRoxas13th 8 лет назад

Do we really need to balance the neutralization reaction?

@TheBolinhadigudi 8 лет назад

sure

@TheRoxas13th 8 лет назад

Okay. Don't know why i asked this question.

@roberteospeedwagon3708 8 лет назад

If you have something like, Ba(OH)2 + HCl, you can't know the ratio without knowing how much water it produces, which you would need to balance the neutralization reaction. You don't have to, it just helps you get the correct balanced equation

@relaxingandedits5340 3 года назад

My brain is balance d

@Domain821 8 лет назад

SUPER LIKE . THANK YOU

@relaxingandedits5340 3 года назад

Muaah

@wouterenbob 7 лет назад

Do you have any extra exercises?

@relaxingandedits5340 3 года назад

Downward dog

@hannah-joycandy1247 4 года назад

Where did the .0200l come from??

@amlandutta.29 5 лет назад

Thanks man!!

@relaxingandedits5340 3 года назад

Women

@relaxingandedits5340 3 года назад

Wonderwoman

@yumenoritsu 8 лет назад

Thank you :)

@EveryoneHarmonyPeace 6 лет назад

good I got 0.0422M as well

@flashx626 4 года назад

The shortcut formula you used was incorrect because of which results you got were also incorrect. The correct formula is M1V1/n1=M2V2/n2 Using this formula we will get exactly same answer.

@omaryproductionz1610 3 года назад

does the n stand for the general molar mass of the compound?

@nickolasspagnolo7304 3 года назад

@@omaryproductionz1610 it stands for the number of moles. when balancing the equation. properly needed that 7 months ago

@hudsonwebb7710 5 лет назад

For the shortcut do u always milt by 2

@tejaskulkarni6041 5 лет назад

no, once you find the balanced equation, then you will know what to multiply by. It will differ for each reaction. In this balanced equation, we saw that there were 2 mols of HCl for 1 mol of BaOH, so to find the concentration, we would have to multiply the "shortcut answer" by 2.

@_moonlightie_tita_3796 5 лет назад

Can't we just use MV1 = MV2 ?! The result then is 0.0210 , where's the problem ?!

@averyzierden3205 2 года назад

How do I make my calculator make it look like that

@jackbailey9714 7 лет назад

Why don't you write the net ionic equation?

@khalifaalkhalifa1709 5 лет назад

Just become my teacher.

@marsh6714 8 лет назад

his voice reminds me of cecil palmer from welcome to nightvale hahaa

@katibryson9300 6 лет назад

omg thats so accurate

@puppetactor2515 8 лет назад

My teacher taught us dm instead of L, is there a difference

@bjehulk 8 лет назад

You just have to convert

@puppetactor2515 8 лет назад

+bjehulk How?

@xBIJOY 8 лет назад

you don't have to convert because L is dm3

@xBIJOY 8 лет назад

you don't have to convert because L is dm3

@Peter_1986 8 лет назад

1 dm³ is the exactly same quantity as 1 litre, you can just pick any word you want. If you imagine a cube where each side is 1 dm long then you can quickly realise that a box of that size would probably hold about one litre - which it does. As for converting between units in general, search for "dimensional analysis".

@AcerLab 6 лет назад

Why couldn't you be my teacher...

@alpha_asibor 6 лет назад

Who's thinking?

@liulniguse3625 8 лет назад

WHAT ABOUt the SIGNIFICANT number

@Peter_1986 8 лет назад

The answer is expressed to 3 significant figures (0.0422), which was the number of figures for each of the values in the beginning of the problem. Note that zeros in the beginning of a value don't count as significant figures, whereas decimal zeros do count.