How to Calculate Molarity | Practice Problem #1 | Solution Chemistry | www.whitwellhigh.com

[lap520]

1.461g NaCl ( 1 mol NaCl/58.44g NaCl)= 0.025 then just convert 250mL to liter which is 0.25L. Then to find M, 0.025mol Nacl/0.25L= 0.1 M :))

[lap520]

This solution was very complicated. :( I got 0.1 on the final answer which is somehow correct.

[Superfresh602]

I got 1.526878324 on a answer would be 1.5 because of the significant figures?

[Superfresh602]

@Superfresh602 there is two significant figures in the answer because it is 58.00g

[erogers4248]

3:58 lolzz

[TheEnriquification]

Great video, I am currently doing this for AP Chemistry and I was stuck. Thanks for this video, keep em' coming!

[MegaKoreanboy]

@whitewellhigh Dude... You sound like Cleveland from Family Guy AND are a great teacher.

The epic combination...

[JulioMaestro116]

I think it's quite funny how you didn't convert the 250.0 ml into 0.2500 L but instead just multiplied the other side by a thousand. Clever trick ;)

[whitwellhigh]

@JulioMaestro116 - :)...thank you....but i can not take all the credit....when I was really young....that is what we did (just go ahead and convert the mL to L).....but as I advanced in my years of teaching.....It made more sense to use dimensional analysis to solve/convert the units desired.

[ooeeooahah2007]

awesome thank you :D!

[Deadsotc95]

Chem final tomorrow, hopefully I will pass thanks for the help!

[rebeccam2]

This actually helped me so much, thanks a lot I have hope to pass chem now!

[fondizzie]

Thank you thank you

[kirlu96]

Thanks



[basilishere]

Very precise explanation

, thank you

[chadrigwapo]

Sir, I have a question... You said # of liters of solution so it must be solution = solvent+solute.... Thanks

[whitwellhigh]

@chadrigwapo - sorry...it is that many moles for that many liters of solution.....sorry for any confusion :)

[fatassboy666]

thank you

[EmilyHorneswaggle]

molarity? here in canada we call this: 'concentration', or 'molar concentration'

[whitwellhigh]

@EmilyHorneswaggle - you are correct emily...that is another name for it....I refer to it as concentration myself....but for a particular set of homework problems in my students book, they referred to it as molarity (which is correct) so that is what I put in the title...Maybe I should have added the words molar concentration and concentration to the description lol

[elcid812]

You're a life saver!

[whitwellhigh]

yes it is :)

[maneatingtoilets]

Is molarity the same as molar concentration? Please answer quickly if you can.

[zeyloveslove]

thank youuuuuuuuuuuuu :D

[Igotmyvanson20]

you need some tequlia :)

[Phuongsway]

why in hell did i not go to youtube first for chemistry clarification? I would have if i knew it was SOO much more helpful than my chem teacher!

Thanks!

[Shuffle2dMax]

@Phuongsway thank your teacher because by searching and finding your own ways around problems you are gaining important skills that help you in life

[benja303]

i understand YES....... Fuck yes..

[thewizardlol]

Thank you very much!

[legosupra]

Thank you :)

[MrrDevin]

thanks man! 

[RobotgruntXD]

thanx!

[nelsonarias10]

bless you!!

[isangelotanglao]

wow. you are twice as good as my chem teacher, i just learned more in 5 minutes of this, than in hours in class THANK YOU!

[deepi221]

Thank you soo much, it was very clear and helpful

[SuperUltimatum64]

Thank you! My stupid chemistry book didn't explain this process!

[mishmuhem]

thank you so much whitwellhigh..we got this as a pre lab assignment.. we had to teach this to ourselves (without lecture) in order to get it turned in before lab :(

[TrendSettingDJ]

Thanks whitwellhigh. This was clear & concise. Keep up these helpful videos.

[RocknGirl4]

be my chemistry teacher instead D:

[CoffeInside]

Thanks for help. This works too:

x = 1.461g of NaCl

y = 58.443 g/mol

z = 250.0 mL

molarity = x/(y*z);

[whitwellhigh]

@GekoFTW - thank you so so much....I am glad that I helped :)

[diegoelopez]

@whitwellhigh Yea, my chem teacher doesn't teach us squat, he gives us homework THEN shows us how to do the problems... T_T Thank YOU.

[whitwellhigh]

@diegoelopez - well...i suck on some days too LOL....But i love this stuff :)......and love teaching it at its simplicity level......:)

[Shuffle2dMax]

@diegoelopez thank your teacher because without you knowing you took steps to search yourself which is an important skill to have!

[Shuffle2dMax]

@diegoelopez thank your teacher because without you knowing you took steps to search yourself which is an important skill to have!

[missmelissa783]

@diegoelopez mine too! is annoying

[Nicole3900]

@diegoelopez ikr. My chem teacher writes an example on the board, with no explanation, and assumes we understand exactly what he just did. He doesn't explain anything. I am so confused in chem, and it has made me hate the subject more than any other subject I've ever taken. I wish I had a good teacher from the start. Maybe then I wouldn't hate it so much.

[candsofillusion]

I love it...even the sneeze XD

[ClasClownProductions]

i dont get it, teachers cant teach how to do this to kids in a week.

after 5 min of this guy teaching me, i'm set. Great video.

[whitwellhigh]

@ClasClownProductions - thank you :)

[crayoladreitner]

FINALLY! SOMEONE WHO CAN TEACH THIS STUFF!!!

[SpeedReycer]

Dear Lord. This has helped me soooo much! Thankyou! You are great!

[malona23]

BLESS YOU!! scared the shit outta me! haha thanks for all your help!

[whitwellhigh]

@malona23 - thank you...means a lot

[3333sweetie]

@whitwellhigh can you find the number of moles of NaCl by the ratio and proportion method? why don't they teach it?

[whitwellhigh]

@3333sweetie - well....if you mean by percent composition....then...i guess you could....in my eyes...appears to be to much work.....it is easier to just use dimensional analysis to work the problem...that is my choice....however, there is always more than one way to work a problem.....it is just....i used my favorite way to work the problem :)

[3333sweetie]

@whitwellhigh no, i mean like let's say they ask how many grams are in 0.5 mole C? I do it like this:

1 mole Carbon=12grams Carbon, let X=new mass of carbonand u multiply 0.5 by 12g to get 6 grams, theanswer. can u do that?also, where can i find a cd or place where they have interactive lessons(like yours on chemistry topics)?

[whitwellhigh]

@3333sweetie - yes you may do that if your professor allows you to....some are picky and it must be done their way.....0.5 (12.0gC/1moleC) is correct simply because the units line up in dimensional analysis.......however....I strongly suggest sticking with dimensional analysis for its flow of units and cancelation properties :).......you could do your method here so long as you remember to divide your number of moles by liters of solution.

[mishmuhem]

@malona23 LOL..but yeah he is a great great help!!!

[mishmuhem]

@malona23 LOL funny comment..but yeah he was a great great help!!!

[intheendist]

much better than all of my teachers that i ever had

[dc13007]

thank you this helped a lot i should be okay for my science test tomorrow so thanks a lot :-)

[ilovemysunshine09]

better than my professor!!!! thank you

[meeDakee]

your better than my teacher

[ninjadrummerman]

wow, i learned more from this than a whole semester of chem at school. thank you so much!!

[zebradragon101]

Thank You!

[phanelius]

Thanks man, your video is very explanatory and easy to understand

[Gigggs45]

thanks man this helps a lot.......

you teach well than my professor...

[Emmaleaiscool]

Thanks and bless you!

[SuthLatte34]

bless you

[blondyboy88]

thankyou and must be weird teaching to a camera lol

[arvie319]

thanks for uploading dis video..dis is so helpful!!

[dynna3]

thank you! u explain better than my chem teacher does.. haha

[cardmandeer]

good video, very helpful

[Kristinaheartsmazin]

Bless you!

[notsovirgin]

I LOVE YOU!!

YOU SAVED MY IN MY YEAR 11 CHEM EXAM ( australian year 11)

[oceanshore314]

Thank you! It's way more clear to me now!

[tjp323]

great vid

[EvilblueWings]

Your video helped me alot.  =D