Molarity and Dilution

[@ProfessorDaveExplains]

Guys, at 0:30 I say "moles solute per liter of solvent", but it's per liter of solution! What a dumb mistake on my part, but it's an important definition to get right so please take note.

[@parulaggarwal9405]

It's ok😄

[@caribaez5711]

Thank you for letting us know.

[@calebkaufman7852]

PROFESOR DAVE GROHL

[@Hockeyjody]

you also need to better explain how you got .5 as your asnwer from (1.0M)(1.0L)= M2(2.0)

[@filosofo-sz5ks]

@@Hockeyjody I'm a bit late, but it's supposed to be an equation from the algebra class.

[@80milekyle70]

I love the quiz music. They should play that during finals

[@BRuvSt0AsT]

yes

[@louisclexvi7200]

you just helped me pass my exam basically. you magnificent man.

[@paigejohnson9201]

Thank you for making this so concise, while also making it clear! Helped me a lot with my classwork. :)

[@kyokokirigiri100]

I try to be serious and focus but the face at 0:08 fucking kills me lmfao

[@IvoryOut]

Short, to the point, incredible explanation. THANK YOU!

[@AbdullahRizwan-qo1xv]

The most underrated teacher ever

[@Zak-qp5ln]

thank you professor dave 👑👑

[@samsonkatende2696]

you have helped me big time ..i appreciate

[@lilnugget2280]

thank you professor dave👑

[@Zak-qp5ln]

thank you professor dave 👑👑

[@tempestlll9638]

thank you Professor Dave👑

[@hadiharhous4287]

Thankyou professor Dave

[@tempestlll9638]

thank you profesor Dave 👑

[@MrCsScience]

Molarity = moles of solute per liter SOLUTION, not solvent. I like your videos and the way you explain, but can't use it w/my students as they'll be confused :(

[@ProfessorDaveExplains]

there's an annotation in place that makes the correction

[@bringbackmemesineurope1576]

what calculations did u have to do to get 0.600L of water? great video btw

[@alihave1]

your channel gonna be the best😍❤️

[@phenomenalphysics3548]

1:21 does that mean that even after adding more solvent volume of solute remains constant?

[@gabriels2395]

I would say YES. Because the volume of solute only increases by adding more solute. Now it is the CONCENTRATION of that solute the one that changes if the volume of solvent is altered. This because the concentration is a "ratio" between the solute AND the solvent.

[@phenomenalphysics3548]

@@gabriels2395 thank you

[@etewis87]

Holy hell I couldn't remember this simple equation for the life of me trying to figure out a concentration problem. Clutch. Thank you!

[@yashcaroicar4542]

cool video...super helpful .... what animation software do you use?

[@ProfessorDaveExplains]

adobe after effects!

[@muhammad922]

Thanks prof. Great

[@Malikin]

I got the answers right. Thanks professor

[@1NikkiPink1]

First of all, thanks for the great videos. I just have a quick question. Are you supposed to add the mass of the solute to the solvent to get the total mass of the solution? I don't know this for certain, and want to make sure I am doing the right calculations. Thanks in advance. *Edit* Mean't volume, not mass.

[@ProfessorDaveExplains]

well here mass doesn't come into play, as molarity is moles solute per liter solution. but there could be other applications where mass is relevant.

[@1NikkiPink1]

So the volume of the solution is the same with or without the solute inside? That's what I meant.

[@1NikkiPink1]

I confused mass and volume. Sorry.

[@ProfessorDaveExplains]

oh, yes! i know it seems weird but solute will fit into the spots between the solvent particles and won't impact the overall volume, so if adding a solid solute, we don't have to factor that into the total volume. of course if combining liquids, we do add the volumes.

[@1NikkiPink1]

Excellent! Thank you so much again!

[@ryanwilson8677]

You go Dave!

[@user-ry5om3wn5c]

Prof Dave you are wrong it is per liter of the solution and not per liter of the solvent in case of molarity

[@ryanwilson8677]

Love the Elevator music

[@tb2748]

Can someone explain the intuition behind why dilution can be represented with the M1*V1 = M2*V2 equation? I don't want to just blindly use the formula - would like to know why it works. Is there a way to do these dilution problems with dimensional analysis?

[@ProfessorDaveExplains]

well concentration and volume are inversely proportional, if you double the volume of solvent, the concentration will necessarily be cut in half

[@tb2748]

@@ProfessorDaveExplains Super fast reply, thanks!

[@adrianbernardaguirre1050]

Hi just gonna ask if you are converting mL to Liters you should divide it by 1000 right? should it be 0.2L or 0.200L? the answer will be different but only in decimal places.

[@ProfessorDaveExplains]

yep that's right. number of decimal places will depend on the number of sig figs present.

[@zwoomy2769]

It is 4am, i got a chemistry quiz this morning, and I'm trying my very best to sort this in my brain 😭

[@rassimsimou1594]

Good

[@hadiharhous4287]

Thankyou professor dave

[@ladyt2588]

U need to remake the video with that correction or insert the caption in the video. The description notes isn't enough

[@ProfessorDaveExplains]

Well that sounds lovely, except that it's not possible.

[@kripashankarshukla4073]

Sir you explain very well and reply to all the questions. I asked 3 questions through comment and you replied to all of them after 1 or 2 hours. You are superb

[@ProfessorDaveExplains]

i do my best! please tell all your friends to subscribe!

[@kripashankarshukla4073]

Yes sir, sure

[@sardarsourabhsingh5243]

Thanx prof. Dave

[@EmeraldQueen206]

Where did the 74.1g come from?

[@nadiahulwat.1788]

What about Precipitate kind of elements, its that count in this term as well? Anyway thank you Prof. Dave💎

[@ludwigliu4877]

The solubility of calcium hydroxide is really low so I think the question at the end is not feasible at all Professor Dave

[@user-py5fj1ce2c]

limewater?

[@BadassVideos]

has anyone pointed out that molarity is moles of solute per liter of SOLUTION? just wondering

[@alicechalwe2245]

Thanks..

[@aluminiumoxide8750]

Is proportional dilution same as stock dilution ?

[@pietertalens1256]

Great videos! Just a quick question. For the sample problem, when I calculate the molar mass of Ca(OH)2 I get 92.1 not 74.1. What am I doing wrong? Thanks!

[@ProfessorDaveExplains]

i'm not sure! it's just Ca + 2O + 2H

[@sillverice1212]

you can just google the molar mass as well. im not sure what you are doing wrong but The molar mass of calcium hydroxide, Ca(OH)2 , is 74.092 g/mol rounded up to 74.1. You take the molar mass of CA and then oxygen and hydrogen. Since there is a 2 around (OH) you need to double both oxygen and hydrogen so its 40.078+ 16+16 + 1.008 +1.008 totaling around 74.1

[@yashodhanbarve3581]

thank you chemistry Jesus

[@caribaez5711]

Chemistry looks pretty cool

[@trapjawguch3247]

It’s extremely hard though

[@caribaez5711]

Tråp Jäw Gùłçh it’s not that hard. I actually wish I could take more courses. I am taking dosage calculations for nursing and I am struggling. That class is mostly chemistry and math. I feel I am smart person, but the class is two days a week and the teacher seems she expects us to understand what is going on. In my opinion, she is sort of neglectful when I ask her questions. I feel I need to open up my mind more about chemistry.

[@Bookshelf823]

I just learned 2 months worth of chemistry in 2 minutes

[@nataliecorrea5417]

A bit confused in re to dilution - how do you get the value of M2?

[@ProfessorDaveExplains]

it's all just algebra, plug in what you have and solve for what you need

[@nataliecorrea5417]

@@ProfessorDaveExplains woah! lightening response time - thank you so much!

[@honeydip1031]

How did you get 74.1 g? in the comprehension portion of the video?

[@ProfessorDaveExplains]

molar mass of calcium hydroxide

[@ITSLIZZ111]

from the periodic table

[@ryanwilson8677]

Ohh and love the hair and beard. Nice job.👍

[@hueyguo731]

thx！：）

[@waqasmaqbool3759]

Why we call solution in molarity instead of solvent ???? Quick

[@ProfessorDaveExplains]

What is the question?

[@elitehumpty3603]

solvent is part of the reaction. Molarity is literally the answer it is also called the solution.

[@gothicsounds8042]

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[@trevcymanagementllc1528]

chest hair for the win😂

[@tonyzhao409]

have someone ever told u u look like Jesus

[@ProfessorDaveExplains]

many times, my friend.

[@tonyzhao409]

Professor Dave Explains hahaha and also u didnt teach me shit

[@tonyzhao409]

Professor Dave Explains jkjk i luv u .

[@raffih5236]

yeah

[@ariannakraljic6237]

I thought he looked like Lord Farquaad

[@davidrenteria9585]

best fkin teacher ever... my respects to you mannn woooow , God bless you!

[@JATINMANISHI2007]

Bro looks like AI generated

[@anilshewalkar9914]

The 41 dislikes are of fools

[@cristhiangarcia5991]

love to the chemistry lord Jesus!

[@bio366geethasankar7]

🙏🙏🙏

[@gregmosier5908]

Dave, the thumbnail of this one has you with your mouth open :-)

[@ryanwilson8677]

Peace out ✌️

[@ryanwilson8677]

Tootorials lol

[@chari3440]

Do u alone make these videos??

[@ProfessorDaveExplains]

yeah!

[@ryanwilson8677]

Look at that chest hair!

[@aarushprasad4493]

can i have ur autograph