Spectrophotometry and Beer's Law

[@olivxa_aa]

my first time seeing prof dave without long hair and my whole world has just changed

[@nessieglymps1283]

Hahahahhahaha

[@sithminimasha]

Yes 😀

[@TasTheWatcher]

Beer's law? Aye, I'll drink to that.

[@Thaumius]

*Beer Lambert Law*

[@willm3027]

Me too

[@rauter828]

@Mekhi Taylor Any method for FB hacking..

[@masterally6025]

Shalom Alikum its very obvious that its a Trap Bryant keegan and Mekhi Taylor are the same person... The tricks works like this: the person has an account by the name Mekhi Taylor and then comes and says "I don't know if anyone cares but I just hacked that and that etc etc Then The same person logins into another account by the name Bryant keegan and says" Oh you are right I checked it out".. When in reality its the same person. If you are seeing this. Whatever your real name is.. I will use the fake names for now.. Mekhi or Bryant Whatever your intentions are. I hope you don't continue to trick others. I hope you find what you are looking for by doing something that benefits you. And JASMINE T P. Dont fall for such tricks. Don't click in what people asks you to Click and dont visit websites in which people tell you to visit.. Its a trap.. Take care. Fi-amani-ellah

[@rauter828]

@@masterally6025 I understood..I never tried..just to know what will be d reply..

[@CoastalBachelor2009]

I'm Scott Beer and I approve this message.

[@jqyhlmnp]

Hi Scoot Beer. My name is not Scott Beer.

[@T.J.1033]

​@@jqyhlmnp Hi not Scott Beer..... I'm Dark balls

[@TRI3NERGY]

​@@T.J.1033hi dark balls , i am niggativity

[@OFFICIALGAMELORD]

I can't explain how to thank you .Tomorrow is my test and now I'm feeling relax.

[@barbiesnack]

I love being able to understand something!

[@eewls]

Thanks

[@rahilsiddique6950]

Thanks a lot Professor Dave, you are literally a life saver

[@slow_bike_show]

he is he has canonically saved over 200 people from trains, mugging and chemistry mishaps. This is his penance as professor Dave caused the 2011 Fukushima Nuclear Disaster

[@alexting827]

@@slow_bike_show :O??

[@dumitru-claudiusergentu6720]

Hi Dave, since A is log (I/I0) and A is e*b*c, then I = I0 * 10^(-ebc), not I0*exp(-ebc) because it is not a natural logarithm but a base 10 logarithm.

[@ahmedmadhy842]

One of the best channels in the field

[@tommysteinbrecher]

Wow I was just lectured about this in chem and now studying for the midterm in 2 days what’re the odds hell yes professor dave

[@rebornmmmmuch]

Very well explanation. Now I get the idea what this is all about🙏🏻

[@SoltanAxl]

Thank you from Algeria 💚🇩🇿

[@sunflora27]

thanks professor dave! This helped reiterate what my online course just blew through rather quickly

[@Gafa996Gaddisa]

Hi professor. I always learn something from your channel.

[@nickelpence]

Just shared the video with a friend who didn't understand wery well what they did just today at chemistry class😉

[@brianbaas8650]

Nice first like and Comment! Loving your channel Bro, I always learn something from you 👌🏻👍🏻😁😎

[@funnyseasonalnews8193]

Thank you professor Dave I have got relevant notes

[@LittleWaffle]

Thank you for this well-explained video !

[@antoniocurcino9976]

Thank you so much for the explanation!

[@WenHanDu]

In 3:36, why the log function get the relationship of e instead of 10? I really confused

[@joshmemarrynagdey1639]

Thanks a lot... you make the topic easy to understand.

[@samhagan1520]

You are easily better than my chem lab ta. Thank you. Ps. I like the new haircut.

[@evelynvarsovia3380]

Very clear explanation. thanks prof Dave

[@rominamzf]

Thank you soooooo much, it is so useful for my presention

[@yolo_earth]

Thanks for your video, Professor Dave! one thing to mention, it might better to tell log used here is actually base with e, not 10. In context it explained greatly, but itself I got bit confused for secs.

[@ellavaldivia6757]

Thank you professor David for this video.

[@woomp2004]

I thank you from the bottom of my heart

[@laibakhan8380]

Proffessor Dave, I love you.

[@jerryhymytang8859]

Hi professor Dave, I realized that you convert the log with a base of 10 to a exponential with a base of e, shouldn't it be in the base of 10? or else a natural log should be used instead of log in the base of 10

[@muthegameonline]

I also thought the same

[@GameHero531]

It's unfortunate and rather annoying but some textbooks and professors use log to mean "log base e", while others use it to mean "log base 10". It makes sense to just call log base e "log" if you know where the logarithm operation originally came from, but it's confusing nonetheless

[@CMThota]

​@@GameHero531 so basically he meant log base e (ln) not log base 10? (the terminology is a bit new so just clarifying :))

[@GameHero531]

@@CMThota correct

[@autonews1621]

thanks bro, so annoying

[@bbnnationoriginal2722]

Bro just causally saved my chem grade

[@divyanshugogna6152]

thanks professor dave really helpful

[@williamadams137]

Is “log” log base ten? Because i usually see people use “Log” or “ln” for natural log.

[@ProfessorDaveExplains]

yep if the base is not specified it's implied to be 10

[@yunus-ff2mw]

@@ProfessorDaveExplains Also, in our experiments, we took the logarithmic as 10 instead of e.

[@organicnky7448]

My favorite on internet 💎

[@___S.______a.______m._______3]

Wait at 4:40..why did we plug initial intensity as one?

[@kylabarroga4524]

You're not professor Dave...

[@ProfessorDaveExplains]

Um, yes, I am Professor Dave. The channel is called Professor Dave Explains. See?

[@gabriellanyirenda649]

It's because of the short hair isn't it😂😂

[@KaitokiNohara]

​@@ProfessorDaveExplainsproffessor u gonna let the imposter slide?

[@abhisheksaha6035]

​@@ProfessorDaveExplainsUmm, that made us more sceptical 🤔

[@ronanclark2129]

Hearing all these numbers made me anxi😢us about my homework so maybe I'll watch the rest another time

[@pritykarmakar4937]

Thank you so much sir🙏

[@vicentesayson2990]

Do you think sir, it's a good idea to create a spectrophotometer using specific wavelength only? For water analysis?

[@ProfessorDaveExplains]

seems like an arbitrarily limitation to me

[@vicentesayson2990]

@@ProfessorDaveExplains can you explain further? By the way sir, I conducted some experiment using pasco spectrometer, i see that at 650nm wavelength the water absorbance of a distilled water is 0 , that's why i'm thinking to use 650nm as a standard source of light to determine the impurity of water

[@Ajay-Maurya.]

@@vicentesayson2990 anything would do right? light absorved same?

[@Mt.Trashmore]

Literally perfect timing!

[@mongoosehunter6771]

3:34 how did that purple equation turn from the above one?

[@mermerrrrrrrrr]

Thanks for your helpful videos

[@hn-uv3vl]

i love you so much istg thank u 🥺 for ur content ❤️

[@sithminimasha]

Thank u professor Dave💗

[@thomone23]

Thx 4 U'r effort ♥️

[@aniawo5119]

Very useful. Thank you.

[@TheEmperorjun]

Thanks a lot professor...

[@lilyanahasan8589]

thank you for this!

[@namithacd5650]

Can you do one for thin layer chromatography? Would be greatly helpful!

[@tuna3875]

I just realized how Professor Dave looks like moistcritikal

[@defneurfaloglu855]

u saved my life, thank you

[@استبرقابراهيم-ط1ر]

Thank you so much 💓 💗

[@mansurie]

helped a lot thanks!

[@jimpanse1638]

Why is the number of moles a concentration? Isnt the concentration moles/volume? How can i get the total number of moles in the cuvet?

[@quintonwilson8565]

Great vid, wish I saw this earlier.

[@leenalsader8476]

Thanks 🌸

[@sammyapsel1443]

Can someone point out the following: If Transmittance is defined as I/I0, then why isn't Absorbance defined as A=1-T , but rather as A=-log(T)?

[@sammyapsel1443]

What does then 1-T signify? The percentage of light that doesn't get transmitted which is not the absorbance?

[@shadali4264]

best professor

[@gria8329]

On the example why is the initial intensity 1, where did that 1 came from??

[@bennettegaper4344]

Thank you

[@guttipavan9306]

easy understand. tq sir

[@axediepied6993]

THANK YOU!!!

[@yarlankini2170]

Awesome 👍

[@tnjoegaming2458]

Sir can u pls give a lecture about calorimeter principles and its application..

[@TommyZommy]

Dave, are you considering making computer science lectures?

[@ProfessorDaveExplains]

yes definitely one day!

[@scigrl2870]

Hello, thank you for your videos - I show them to my undergraduate chemistry classes on occasion. However, there is an error in this video - the opposite of log is 10^x not e^x

[@kamilewais-orozco9971]

e^x is a notation for 10 to a power

[@kamilewais-orozco9971]

John Cavanaugh it doesn’t, but it’s helped me sort it out in my head

[@krellemaster]

log(x) is ambiguous and can be used to represent both base e and base 10. It is exceedingly common to use it as base e in physics.

[@Ajay-Maurya.]

​@@kamilewais-orozco9971 e is a special constant appearing in nature

[@AnyanwuPeterIkechukwu-nw4ri]

Please professor Dave, why do you use Iø as 1?

[@leenabulaban8450]

did you get an answer?

[@rosapizana8597]

My professor used the example as an activity for the class but she asked which compound the measurement belongs to and I have no idea how to determine that.

[@jagrutipaneliya4548]

Could you give me a name of software where I can plot my graph in better way?

[@ayeshariaz8380]

Is the value of incident light always taken as 1?

[@daviskimani1890]

Hey professor can you explain on how to calculate percentage transmittance. please😊

[@setsu2221]

Absorbance = 2 - log_10(%T) Example: 1 = 2-log_10(T) T = 10%

[@fabioverdi6291]

Help with a question ????? A compound absorb light in 227 nm. The standard curve calibration for the compound is Abs = 372x + 0,6432 which the concentration is g/100mL. The technique was analytical standard adding from fluoxetine hydrochloride (C17H18F3NO.HCl - molar mass = 345,79 g/mol). So determine the concentration in mol/L from the analysed solution. Show all calcs progression.

[@lijaucolouiserichard2320]

PROF. DAVE LANG MALAKAS (in filipino-only prof.dave is strong)

[@adduct99]

How is the path length selected?

[@ProfessorDaveExplains]

it's the length of the cuvet

[@sivasankar3349]

how 0.35 came for molar absorptivity?

[@cliffordwilliams9597]

I'm confused how did we go from log I/i0, to e to the power of stuff?? Should it have been ln I/i0?????

[@12uullaass12]

I think he made a mistake he mistook log(I/i0) with ln(I/i0). it should have been I = i0* 10^-(epsilon*b*c)

[@Sirigowda2580]

Verification of beer lambert law through colorimetric

[@supunmalinthasandanayaka885]

Good vedio ♥️

[@konstantinrebrov675]

Can you teach us how to make beer from a chemist's perspective?

[@douniaelba4603]

Hi professor Could you do a video about asanning electron microscop plz

[@abuhureyraat-tijani6113]

2:50

[@scott_meyer]

Beer's law? Drink it.

[@ssm-56281]

What was it about bonding? It wasn’t explained

[@جهادالحربي-ق4ظ]

This relate with physics or biology???

[@twinklefavour2983]

I'm August beer and i approve this video

[@Philosjutsu]

I like the look

[@ashishbhattacharya2807]

Thanks..

[@mactavish1411]

Anyone here to learn all of AP chem for the 2020 exam? ~We're all in this together~

[@petranuth7112]

Beer Lambert's Law

[@mw2nubcake]

Fuck you're good Prof Dave

[@Zach-xm5wc]

Anyone else have a broken Spec 20 for lab?

[@alizedan3442]

Greaaaaat

[@chrisyun4960]

nice cut

[@KristenMedinaTenten]

i hope this could really help me pass 😭

[@rassimsimou1594]

Good

[@yayapuncio497]

the more of a substance the light travels through

[@yayapuncio497]

the more of it that will be absorbed

[@yayapuncio497]

the higher the concentration the more of the substance will be absorbed

[@nwerd]

Clint david sala and James Hendrick Aban Shourtout🎉

[@FarukUmarBello-eq1zu]

Please how did our I become 1?

[@leenabulaban8450]

did you get an answer?

[@KituPattnaik-m2s]

It's a reference to 100%... If we call 100% as 1 then other percentage are that fraction of 1 😊.

[@leenabulaban8450]

@@KituPattnaik-m2s thank you

[@HaroldCornbreadCarter]

I like beer, and I approve this video.

[@doriankiss1]

When it says log, I guess that's the natural log, ln.

[@curtpiazza1688]

👍