Molarity/Molar Concentrations

[MegaKoreanboy]

@papapodcasts Could you please make a video explaining how to calculate the Liters of a solution made with the given molarity and mass of the solute?

[sonicfanrs]

Thanks Mr. P! I know how to do my homework now! =)

[555teson383]

i'm having to study chemistry as a freshman for science UIL, any suggestions as to where i should be studying this stuff?

[DoctorHpoduction]

Do you have a video on molality?

[kristenxoxo3]

all of these videos are literally the only reason im not failing chemistry right now...

[DanielFuscoMusic]

yay....I just found out I just extremely failed my chem test... woohoo. -__-

[123monkey123]

You are a god among men

[goose0139]

thank you !!!

[Plok120]

I actually get it now...

ALL MY INTERNETS...

[lilsexylovechick]

A student is instructed to titrate a solution of sodium hydroxide with hydrochloric acid. The hydrochloric acid available in the laboratory has a concentration of 0.8mol dm-3 but this is too concentrated for the titration and must be diluted to 0.08 moldm-3. The student decides to make 250cm3 of this diluted solution in a volumetric flask... Calculste what volume of the 0.8mol dm-3 hydrochloric acid student would need to mix with water to make 250cm3 of a 0.08 moldm-3 solution. PLZ CAN U DO DIS

[lilsexylovechick]

you know it's like physics. using the pyramid really helps. u have to find something first to find the other..it really helped.

[lilsexylovechick]

Omg thnx so much you are a great teacher. trust me i understood. please reply.

[SwagLikeDEV]

Thanks so much or that! Ive got my HSC Chemistry exam & I havnt understood this all year hahah! Now I actually get it. Good timing right! :)

[lindaandjeffsampson]

You are a great teacher. Thank you.  This has really helped. I have a test tomorrow.

[911Sapphire]

Thank you sooooo much ! you saved me !

[sohoyankee66]

Good stuff. Thank you for taking the time to post your classes.

[Papapodcasts]

@sohoyankee66 Thank you for that acknowledgement I really appreciate it. Good luck with your studies.

Mr.P

[Tennysen]

awesome Mr P

[lover4music94]

i can't seem to get this question : a technician dissolves 50g of potassium nitrate (KNO3) in a small amount of water and then adds more water to obtain 500 mL of solution. What is the molar concentration of this solution?

[Papapodcasts]

@lover4music94 Divide 50g by the molar mass of KNO3 to find your moles. Convert mL to to L and divide your moles by your volume that you've just converted.

[bumb9]

At 6:27, your result is 9.94x10^-4 mol, but really it's 9.945x10^-4 mol. In my country (Spain), we often round up our results (in this case, it'd be 9.95x10^-4). Any way, thanks for posting your video. It helped me a lot :D

[ZahidAnwar5555]

I did not understand at 4:09 when the ans was 0.15....so how u convert it into 0.2mol/l

[Papapodcasts]

@ZahidAnwar5555 I rounded the answer based on "significant digits" used on the question. You have to understand the concept of significant digits to understand why I rounded 0.15 to 0.2.

However, if your teacher doesn't mind you not using significant digits rule, keep your answer as 0.15

Hope this helps you. Good luck with your studies.

Mr.P

[ShadowMysticWarrior]

Man thanks a lot!

[MultiMoe91]

thanks ALOT Doctor.. for the video very helpfull!

Do you have a video about balancing oxidation - Reduction equations?

i'm having a hard time understanding it.

Thanks again.

[photoxloan]

oh wait.. i'm stuck.. i'm doing home studying with your help.. uhhm.. if I have NaCO3 what is the molar mass of CO3? is it 1 Carbon and 3 oxygens? so it's 48g? I know it's a little bit off topic here but I miss a tiny thing on my calculation then it would be worse in the final answer. thanks papa

[Papapodcasts]

@photoxloan Hi there. Just to correct your formula, it should be Na2CO3. So the molar mass of CO3 would be (12.01+ (3x16)) = 60.01 g/mol. The 48 g you have is only for the O's.

Hope this helps you. Thanks again for watching and using my videos with your home studies.

Mr.P

[MrDevin666]

Some kid has 99% in Gr. 12 chem and 96% in Gr. 12 pre-cal math - Shaun McDonald

[MTAL4ever]

omg i'm deffs gonna get 100% tomorrow ;)

THANK YOU

[Papapodcasts]

@MTAL4ever You are very welcome. I wish you great luck on your test. Thanks for watching.

Mr.P

[BAROJ6564]

Yay! You're so helpful! Thanks!

[littlegreengirl174]

How did you get to 58.44 g/mol?

It's the only thing I didn't get, the rest is great.

[Papapodcasts]

@littlegreengirl174 The 58.44g/mol is the molar mass of NaCl. So use the mass numbers for Na and Cl and use the units g/mol. Add them up and you will get 58.44 g/mol. Thanks for watching. Best of luck with your studies.

Mr.P

[littlegreengirl174]

@Papapodcasts Thanks!

[blablanoob11]

thanks you are a life saver!!!!

[justshakeitbabe]

ahhh when you explain it i feel like a dummy because you make it look so easy!

thank goodness for you vids.

thanks a bunch :]

[bomberfun1]

It's going very well! Thank to your videos, literally I aced the Limiting Reagent test :-)

[Papapodcasts]

Awesome! That's great news. Not an easy topic. Keep up the hard work.

[bomberfun1]

Unbelievable video!! Absolutely helpful!! Kudos!

[Papapodcasts]

Thanks alot. How Chemistry class coming along?