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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!!!!!!!!!!!!!
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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?
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!!!
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.
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...
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?
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?
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 :)
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
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?
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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?
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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!!!
One of the highest quality lecture on youtube (requesting to increase the volume of the audio)
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Thank you for this. It's quite explanatory.
Question: at 10:56 why are we subtracting y with 0,072 shouldn't we divide it instead, since m is multiplied with x ?
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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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...
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?
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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.
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?
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
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
The best ever. Could you please make a video on FTIR and its interpretation, NMR and isothermal titration calorimetry (ITC).
Why slope and intercept are important? Can you show how to calculate slope and intercept?
If I have A and I wanna find T, how do I calculate ? T=-log A?
Thank you sooooooooooooooo much :]
Sure plzz video on aldehyde Nd ketones as well as solution Nd colligative numericals
Express the following absorbance value in terms of percent transmission 0.765
How can I solve the problems?please
In what units do you measure intensity?
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?
I have a doubt. If I want the absorbance of a compound trapped in a micelle, will the micelle affect it?
excellent
Superb!
Thanks
Thank you!
Thank you 🌸🍃 .
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.
Why would you not have to recalculate the molar absorptivity for part B?
Problem 2
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so the molar absorptivity will still be constant if we change the concentration ?
Yes
Thank you
NICE
Can someone epxlain to me why is it that Absorbance and Transmittance don't sum up to 1 please? D:
Thank u
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is the absorbance of water 0?
In some wavelenghts it is, in some it isn't.
Method 2 is short
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Thank you