8. Upload a good quality image/scan of your hand-drawn Absorbance vs. Concentration graph on the graph paper provided in the lab (pdf format only). Be sure that you've applied all the good graphing techniques in constructing your graph and that your graph includes the interpolation lines so I can see where you get the value for your unknown concentration.

8. Upload a good quality image/scan of your hand-drawn Absorbance vs. Concentration graph on the graph paper provided in the lab (pdf format only). Be sure that you've applied all the good graphing techniques in constructing your graph and that your graph includes the interpolation lines so I can see where you get the value for your unknown concentration.

Organic Chemistry: A Guided Inquiry

2nd Edition

ISBN:9780618974122

Author:Andrei Straumanis

Publisher:Andrei Straumanis

ChapterL4: Proton (1h) Nmr Spectroscopy

Section: Chapter Questions

Problem 4CTQ

See similar textbooks

Similar questions

A standard curve of absorbance vs. concentration has a linear trendline of y = 0.56x + 0.987. Use this trendline to calculate the concentration of an unknown sample that has an absorbance of 1.245.
Fill in the following blanks. As the dye concentration increases, the absorbance of the light [linearly increases, linearly decreases, exponentially increases or exponentially decreases]. The dye concentration units are [molar (M), millimolar (mM) or grams per liter (g/L)] . Although most people wrongly conclude that absorbance has units nm, in fact, absorbance is unitless. This is because it results from a ratio of light through a colored sample relative to light intensity through a clear (blank) sample. The units for the slope of the graph would be [mM, 1/mM or nm] . Hint: the slope is the change in y values divided by the change in x values. The units for the y-intercept of the graph would be [nm, nM or unitless] . The value for the slope of the line that describes the absorbance data is [6.4597 or 0.0008] The value for the y-intercept of the line that describes the absorbance data is [6.4597 or 0.0008] .
A student measures the absorbence of an unknown after placing a sample in a cuvette which contained some water. How will this affect the concentration he reports?
A student generated the following calibration curve using Allura red. They measured the absorbance of a sample containing an unknown concentration of Allura red at the same wavelength. The absorbance of the unknown sample was equal to 0.5. Use the calibration curve to estimate the concentration of the dye in the sample.
1. A solution that absorbs radiation with a λmax at 475nm is placed within a UV visible spectrophotometer. An absorbance of 0.82 is recorded. Calculate the percentage of the incident light that is being absorbed.
Project 2: Food Dye Spectroscopy How can you use serial dilutions to determine the relationship between concentration and absorbance? Graphs may also help in this explanation.
Solutions that contain the FeSCN2+ ion are blood red (you will see this at the end of the second quarter of lab). Consider the regions of the visible spectrum in which the compound should absorb light and prepare a rough sketch of absorbance vs. wavelength for each solution. Label λ max on the graph. (Is this question asking for the graph of my data at the end)
a student in the previous question measured the absorbance of green light from a beverage that contains Red#40 and She finds that the absorbance of the beverage is 0.322. Using the calibration curve from the previous question, what would be the concentration (mM) of Red#40 in the beverage? 0.0322, 0.0497, 2.069, or 0.0008
Given that the percent transmittance of light through a sample was 27.6% what is the absorbance of the solution? Rounded to two sig figs.
Why is it necessary to run a blank before measuring the absorbance of a sample? To allow the lamp and electronics of the spectrophotometer to warm up before taking the sample absorbance reading. So that scattered light will be filtered before hitting the photodetector. To account for the absorbance caused by the cuvette and the solvent To account for the absorbance caused by the cuvette alone .
A sample has a percent transmittance of 50.0%. What is its absorbance?
1.) The absorbance of a sample as measured by UV-visible spectrometry is inversely proportional to the concentration of the sample, such that, as the concentration increases, the absorbance decreases. True or false? 2.) We use spectrum analysis to: A.) to calculate the extinction coefficient B.) Determine the concentration of an unknown C.) Find the maximum absorbance at different wavelengths D.) To verify Beer Lambert's Law