A student creates a Beer's Law calibration curve in the lab. The equation for the best fit line is given below: y = 2994x + 0.0901 The student used a cuvette with a path length of 1.00 cm to collect this data. Then, they tested the absorbance of a solution of unknown concentration. A = 0.135 Based on this information, answer the following questions. |MPORTANT NOTE: You will need to enter your answers in scientific notation. To do so, use a capital E and no spaces. Example: 123 becomes 1.23E2; 0.00123 becomes 1.23E-3 What is the value for ɛ, the molar absorptivity constant, for this compound? Enter your answer rounded appropriately for significant figures but without units. What is the concentration of the unknown solution? Enter your answer rounded appropriately for significant figures but without units.

A student creates a Beer's Law calibration curve in the lab. The equation for the best fit line is given below: y = 2994x + 0.0901 The student used a cuvette with a path length of 1.00 cm to collect this data. Then, they tested the absorbance of a solution of unknown concentration. A = 0.135 Based on this information, answer the following questions. |MPORTANT NOTE: You will need to enter your answers in scientific notation. To do so, use a capital E and no spaces. Example: 123 becomes 1.23E2; 0.00123 becomes 1.23E-3 What is the value for ɛ, the molar absorptivity constant, for this compound? Enter your answer rounded appropriately for significant figures but without units. What is the concentration of the unknown solution? Enter your answer rounded appropriately for significant figures but without units.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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permanganate solution using the color wheel. ART II: INVESTIGATING ABSORBANCE AND PATHLENGTH 12. Based on Beer's law (A = ɛlC, A = absorbance, ɛ = molar absorptivity, I pathlength and C = concentration), what do you predict is the relationship between pathlength and absorbance? What about pathlength and transmittance?
A liquid sample was analyzed for Fe³+. A plot of absorbance (y-axis) vs. concentration (ppm; x-axis) of the external standards produced a calibration line with an equation y = 0.2256x -0.0903 (R² = 0.9973). The absorbance of the sample was 1.25. Determine the amount of Fe³+ in the sample (in ppm).
After creating her standard curve for absorption versus the concentration (M) of FD&C Red 40, a student found that her best fit linear line for FD&C Red 40 was y = 2,962x + 0.005. Her Kool-Aid sample had an absorbance of 0.685. If 0.543 grams of Kool-Aid powder was used to prepare an 8-fl oz cup of her assigned flavor, what is the percent by mass of FD&C Red 40 in her 8-fl oz cup?
The transmitance is 14.4%
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A solution of a dye was analyzed by spectrophotometry, and the following calibration data were collected using a 1 cm cuvette. *graph in attachemnt* Using the calibration data above for the dye solution, what is the dye concentration in a solution with an absorbance (A) = 0.52 if it was measured in a 1 cm cuvette? Group of answer choices 3.0 x 10-6 M 6.0 x 104 M 2.0 x 10-6 M Not enough information is provided.
4 of 15 Abs 2.0 1.5 1.0 0.5 0.25 0. 0.2 0.4 0.6 Concentration (M) With reference to the UV-Vis calibration curve reported above, calculate the concentration (Molar) of a sample whose Absorbance is 1.0. Report your answer with two significant figures.
can you explain how I can get 1.596 mg/L of concentration of Fe3+ in dilutes sample and can you also make the calibration curve.
A medical lab technician creates a standard solutions of percent hemoglobin in whole blood. The technician measures the absorbance of each solution at 520 nm and creates a standard curve of the absorbance versus percent hemoglobin in whole blood and finds the linear equation below, with an R2 of 0.9985. y= 0.0523x + 0.072 A patient sample has an absorbance of 0.893. Using the standard curve data, calculate the percent hemoglobin in the patient sample.
Conclusion 5: You are tasked with analyzing a suspiciously pink sample of drinking water to establish if it has unsavory levels of MnO4-contamination. It has an absorbance of 0.83 at 544 nm when measured in a cuvette that is 1 cm across. Using the equation of your trend line from Plot 4, determine the concentration of KMnO4 in moles/liter. Convert this concentration to grams of manganese/liter and compare it to the EPA guideline above. Trandline is Absorbtion = 2000(Concentration KMnO4) (Y=Mx)
A purple solution is prepared by mixing 5.00 mL of the blue dye solution with 6.25 mL of red dye solution. The calibration curve for each color is provided. Measurement Result Measurement Blue dye stock solution (M) Result 0.1944 M Red dye stock solution (M) 0.2015 M Absorbance at 630 nm 0.00697 0.00193 Absorbance at 500 nm Calibration curve Calibration curve y=0.0682x y=0.0170x Part: 0 / 4 Part 1 of 4 Determine the theoretical molar concentration of each dye in the mixture. Round your answer to 3 significant digits. [Blue theoretical = M D [Red theoretical M X Part: 1/4 Part 2 of 4 Using the absorbance and calibration curve for each dye, calculate the experimental molar concentration of each dye in the mixture. Round your answer to 3 significant digits. [Blue] M Submit A Continue © 2022 McGraw I LLC. All Rights Reserved. Terms of Use | Privacy Center 12 W 10 O