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thank you for making these videos.. seriously, so helpful! i never like them because i'm always in a stress trying to do homework or something but truly thank you so much!!!!
I just had a Chemistry lab where i needed to take a spectrum of 2 solotions one is known and the other is unknown an on he bases of the absorbance i needed to calculate the concentration of the unknown but didt have an idea and i found this so big thanks!!!
I was confused a little bit. for the letter b question, shouldn't i recalculate molar absorptivity with the new given molar concentration (0.65M) as well, before I proceed to the absorbance computation?
there is an inconvenience that I want to point out whenever he displays the question I want to pause and think of it but youtube interrupts the top of the question by putting the title of the video
I love this video...❤❤❤ the transmittance of a solution is found to be 35%. what is the transmittance if the solution is diluted by half? Please help with this homework...
Hello! For my physics class, I had to do an experiment to demonstrate Beer's law. I used a light sensor which gave results on lux (unit of measure for iluminance). Would it be correct to use measurements in lux instead of W/m2 to calculate transmittance? I'm thankful for any help I can get :)
Laser radiation with a wavelength of 720 nm hits a homogeneous surface with a power density of 1 W/cm² Medium. After penetrating 10 cm into this medium, the radiation has only one intensity of 0.904 W/cm². Which medium is it? can anyone please guide about this equation?
Man Organic Chemistry Tutor you are really awesome!! I had a MC final today and I got a 90% in AP Chem and it is completely because of you!!!!!!!!!!!!!
chlorophyll amolar mass of 902.5 g/mol absorbs strongly a 660 nm. At this wavelength it was found that a chlorophyll asolussion in acetone of concentration 11 ug/cm^3 in a glass cell of length 1.00 cm transmitted 12.5% of the incident light What is the concentration of chlorophyll in mol/L. Determine the molar extinction coefficient for chlorophyll. Solution for this problem?
A sample of K2SO4 of total mass 40.7 g contains KMnO4 as an impurity. The molar absorptivity E of KMnO4 is 1.80 ⇥ 104 L mol1cm1 at 520 nm. The sample is dissolved in 5.00 ⇥ 102 mL of water. Then, 2.00 mL of this solution are placed in a cuvette with 1.00 cm optical path and a UV-Vis absorption spectrum is recorded, displaying a maximum at 520 nm with transmittance value of 18.6%. Calculate the mass percentage of the KMnO4 impurity present in the initial sample, assuming that K2SO4 does not contribute to any absorption at 520 nm.
1. An analyst determines the concentration of potassium in five replicates of a standard water sample with an accepted value for its potassium concentration of 15 ppm by Flame Atomic Emission Spectrophotometry technique. The results he obtained in each of the five analyses in ppm were: 14.8, 15.12, 15.31, 14.95 and 15.03. Classify the error in the analysis described above for the determination of potassium in the standard water sample as determinate or random. Please help me
A determinate error can be further categorized into two: constant determinate error and proportional determinate error. Constant determinate error (ecd) gives the same amount of error independent of the concentration of the substance being analyzed, whereas proportional determinate error (epd) depends directly on the concentration of the substance being analyzed (i.e., epd = K C), where K is a constant and C is the concentration of the analyte.
Thank you very much for this. God bless you But I want to ask...what if in another calculation, you don't get the y-intercept to be zero? That will make it a problem in relating the absorbance relation with the line relation. How do you solve that problem?
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Question: at 10:56 why are we subtracting y with 0,072 shouldn't we divide it instead, since m is multiplied with x ?
thank you for making these videos.. seriously, so helpful! i never like them because i'm always in a stress trying to do homework or something but truly thank you so much!!!!
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I just had a Chemistry lab where i needed to take a spectrum of 2 solotions one is known and the other is unknown an on he bases of the absorbance i needed to calculate the concentration of the unknown but didt have an idea and i found this so big thanks!!!
You have been such a lifesaver! I need more professors like you.
Who?
I was confused a little bit. for the letter b question, shouldn't i recalculate molar absorptivity with the new given molar concentration (0.65M) as well, before I proceed to the absorbance computation?
I'm glad you found your calling Will Hunting.
Is that his name?
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there is an inconvenience that I want to point out whenever he displays the question I want to pause and think of it but youtube interrupts the top of the question by putting the title of the video
If I have A and I wanna find T, how do I calculate ? T=-log A?
I needed this for biology I have an exam today😩
Express the following absorbance value in terms of percent transmission 0.765
How can I solve the problems?please
Thanks for your explanation
I love this video...❤❤❤
the transmittance of a solution is found to be 35%. what is the transmittance if the solution is diluted by half?
Please help with this homework...
Hello! For my physics class, I had to do an experiment to demonstrate Beer's law. I used a light sensor which gave results on lux (unit of measure for iluminance). Would it be correct to use measurements in lux instead of W/m2 to calculate transmittance? I'm thankful for any help I can get :)
Oh
Laser radiation with a wavelength of 720 nm hits a homogeneous surface with a power density of 1 W/cm²
Medium. After penetrating 10 cm into this medium, the radiation has only one intensity
of 0.904 W/cm². Which medium is it? can anyone please guide about this equation?
Man Organic Chemistry Tutor you are really awesome!! I had a MC final today and I got a 90% in AP Chem and it is completely because of you!!!!!!!!!!!!!
The most delicious law ever conceived!
chlorophyll amolar mass of 902.5 g/mol absorbs strongly a 660 nm. At this wavelength it was found that a chlorophyll asolussion in acetone of concentration 11 ug/cm^3 in a glass cell of length 1.00 cm transmitted 12.5% of the incident light
What is the concentration of chlorophyll in mol/L. Determine the molar extinction coefficient for chlorophyll.
Solution for this problem?
Can someone epxlain to me why is it that Absorbance and Transmittance don't sum up to 1 please? D:
God bless you, ( I don't believed in god ) but thx so much. The video really was useful.
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make a video on A1%,1cm
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A sample of K2SO4 of total mass 40.7 g contains KMnO4 as an impurity. The molar absorptivity E of KMnO4 is 1.80 ⇥ 104 L mol1cm1 at 520 nm. The sample is dissolved in 5.00 ⇥ 102 mL of water. Then, 2.00 mL of this solution are placed in a cuvette with 1.00 cm optical path and a UV-Vis absorption spectrum is recorded, displaying a maximum at 520 nm with transmittance value of 18.6%. Calculate the mass percentage of the KMnO4 impurity present in the initial sample, assuming that K2SO4 does not contribute to any absorption at 520 nm.
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Method 2 is short
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1. An analyst determines the concentration of potassium in five replicates of a standard water sample with an accepted value for its potassium concentration of 15 ppm by Flame Atomic Emission Spectrophotometry technique. The results he obtained in each of the five analyses in ppm were: 14.8, 15.12, 15.31, 14.95 and 15.03. Classify the error in the analysis described above for the determination of potassium in the standard water sample as determinate or random. Please help me
A determinate error can be further categorized into two: constant determinate error and proportional determinate error.
Constant determinate error (ecd) gives the same amount of error independent of the concentration of the substance being analyzed, whereas proportional determinate error (epd) depends directly on the concentration of the substance being analyzed (i.e., epd = K C), where K is a constant and C is the concentration of the analyte.
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Thank you very much for this. God bless you
But I want to ask...what if in another calculation, you don't get the y-intercept to be zero?
That will make it a problem in relating the absorbance relation with the line relation.
How do you solve that problem?
What is this person's account or email ??
In what units do you measure intensity?
Thank you for the awesome video
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Helpful video. Thank you!
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Why would you not have to recalculate the molar absorptivity for part B?
Problem 2
Question on part 13:17. How do you find concentration when you only have the slope and y-intercept for y=mx+b?
You got the relation between Absorbance and Concentration. So, use that to solve for values of either Absorbance or Concentration.
Thanks a million sir...
Saved me before a final
I have a doubt. If I want the absorbance of a compound trapped in a micelle, will the micelle affect it?
excellent
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so the molar absorptivity will still be constant if we change the concentration ?
Yes
Why slope and intercept are important? Can you show how to calculate slope and intercept?
Sure plzz video on aldehyde Nd ketones as well as solution Nd colligative numericals
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is the absorbance of water 0?
In some wavelenghts it is, in some it isn't.
Lost me at minute 6.
the sound is not good I am quite disappointed