Beers Law

Introduction to Beer's Law - analyzing data graphically with colorimetry to determine the concentration of an unknown coloured solution

[ashapasha]

This video literally made me understand the lab I already performed.

[ethankizziar]

Best explanation of Beer's law I have ever seen...thanks man you saved me

[iCantMakeMovies]

I love how clearly you present the information! Really great job.

[chantellehollingsworthplow]

Your video and explanation along with writing/drawings is a huge help. Thank you so much.

[aryashrestha]

thank you for making me understand my entire internal assessment

[plutoniumiscool]

Would it be possible to calculate the concentration of a compound if i dont have a standard to compare with?

[luisvalenciaherencia]

if I have an unknown substance in which I did a spectrophotometric scan and I obtain a wavelength in which it has its highest absorbance. Is it possible to find the concentration based on these data?

[wayne]

I think you have made understanding beers law so simple, :)
but a quick gripe I have is the background noise, I found it hard to pay attention.

[zharaibrahimi]

Amazing video, saved me stressing from a 3 day stress.
Just the background noise is annoying.

[ameliaamezquita]

hello, i just found this, but why do you do 2-log(%T)?

[nkouprisca]

Sir hello
I have some questions about the lab report on spectrophotometric analysis of the percentage of cranberry juice in cranberry apple juice 
1)Using the entire set of percentages of pures cranberry juice in cranberry apple juice, what is the overall averages, standard deviation and ranges of percentages of pure cranberry juice?
Given concentration(%) and absorbance(A)
5%=0.04
10%=0.22
15%=0.40
20%=0.55
25%=0.68
30%=0.90
2)if apple juice has a non zero absorbance at the lamda max, how would this affect your calculations in calculating the percent cranberry in cranberry apple?would you calculations report a percent cranberry that is too high or too low?

[faizmohammad]

very nice lecture and illustrative explainations

[SuperJhon]

I have an unknown solution where my professor said the absorption is 0.85 and the path length is 1cm what is the consentration of the unknown solution?

What you showed here on the calculator confused me because i only have 1 number how am i supposed to find the concentration?

Also my professor doesnt use or allow the use of graphing calculators so i got confused as to find the slope so i can make my equation.

I also need to use that equasion to find the extinction co efficient and the molar absorbtivity.

So i cant figure out anything until i can understand how to find a

I was given a graph and a bunch if questions and my professor didnt explain much he just gave me equasions with little explanation of how to do it im teaching myself. Its all due tomorrow so its not going to help me now but hopefully your explanations can help in my next lab.

[anjalisharma]

I have put one solution and want to know his concentration .how can I know this by using raw data showing absorbance value and wavelength?

[ozgurderince]

the use of calculator is harder than understanding Beer's Law.

[FreeSkillsStyle]

I have to get the concentration of an unknow solution using dilutions I have the wavelength, the absorbance.
I made 5 dilution ex: 2ml water 3 ml unknow soln 0.746 absorbance 810 wavelength how do I get the concentration

[seppevancampe]

Thank you so much , i finnaly understand it
Legend

[airahmedija]

sir where is the continuation of this video?

[realkh]

You have explained it really well, i have a question about my prac, only if could reach to you via email or anything i would be great i'm happy to pay for your time :)

[jsx]

Great use of the graphing calculator, but unfortunately, not usable on a test. Sci-calcs only.