FOOD DYE SPECTROPHOTOMETRY POST LAB HELP PLEASE!!! 1) If the unknown concentration is higher than the...
FOOD DYE SPECTROPHOTOMETRY POST LAB HELP PLEASE!!!
1) If the unknown concentration is higher than the data points of your calibration curve, should you go ahead and find the absorbance to determine its concentration using the equation generated by your calibration curve? Why or why not? Explain your answer. 2)Are there any concerns if you wait an hour or two after you calibrate the spectrophotometer to obtain the absorbance of your solutions and unknown? Explain your answer. 3) Are there any health concerns when consuming food dyes?
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FOOD DYE SPECTROPHOTOMETRY POST LAB HELP PLEASE!!!
1) If the unknown concentration is higher than the...
Pre-lab: Concentration of Riboflavin 1. The following absorbance spectrum is recorded for a dye. Which is...
Pre-lab: Concentration of Riboflavin 1. The following absorbance spectrum is recorded for a dye. Which is the most likely color of this dye? a. Blue-green b. Colorless c. Red d. Black M stock solution is diluted to 10.00 ml, what is the final 2. If 4.00 mL of a 5.00 x 10 concentration? 3. The absorbance of known concentrations of red food dye were measured in order to generate the following calibration curve. 2. Annotate the graph with the labels...
please help with question 1 and 3 part c Name: 8 9 Lab Section: 7 Pre-lab: The Concentration of Riboflavin 1. The gi...
please help with question 1 and 3 part c
Name: 8 9 Lab Section: 7 Pre-lab: The Concentration of Riboflavin 1. The given absorbance spectrum is recorded for a dye. Which is the most likely color of this dye? a. Blue-green b. Colorless c. Red d. Black M stock solution is diluted to 10.00 ml, what is the final 2. IF 4.00 ml of a 5.00 X 10 concentration? 3. The absorbance of known concentrations of blue food dye were...
Name Lab Section: 1 2 345 6 789 Pre-lab: Concentration of Riboflavin 1. The following absorbance...
Name Lab Section: 1 2 345 6 789 Pre-lab: Concentration of Riboflavin 1. The following absorbance spectrum is recorded for a dye. Which is the most likely color of this dve? a Blue-green b. Colorless c. Red d. Black Wveleneh 2. If 4.00 mL of a 5.00 x 10 M stock solution is diluted to 10,00 ml, what is the final concentration? 3. The absorbance of known concentrations of red food dye were measured in order to generate the following...
Chemistry lab question! Help please! A student finds a solution of blue dye #2 (another food...
Chemistry lab question! Help please!
A student finds a solution of blue dye #2 (another food dye we are not using in this lab) in a 1.0 cm cuvette has a maximum absorbance of 0.572 at 613 nm. The molar extinction coefficient, E, of blue #2 at the same wavelength is 1.21 * 10^4 M^-1 cm^-1. Calculate the concentration of this solution. The same student as in question 3 brings the blue dye #2 solution to her friend Bob to...
Please help I am completely confused, I included the 2 graphs needed for this post lab....
Please help I am completely confused, I included the 2
graphs needed for this post lab. Thank you!
Postlab Assignments . (a) Using your own standard curve, the line equation you generated and Beer's law equation Equation 1) calculate the molar absorpivity (e) of blue dye. For all your measurem cuvette used is 1.00 cm. Use this as the value of b in Equation 1 ents, the size of (b) Using Beer's law equation again, what does a high value...
LEILU.23.27 Eugenia Bueso-Alas: Attempt 2 UUTUUU-Dye SD Incorrectly Low Question 3 (20 points) An unknown food-dye...
LEILU.23.27 Eugenia Bueso-Alas: Attempt 2 UUTUUU-Dye SD Incorrectly Low Question 3 (20 points) An unknown food-dye is analyzed by the method used in this experiment. The absorbance of 5 standard solutions is plotted vs. their concentration (molarity) and a straight line is obtained with the formula: Abs = 4.350x +0.06 An unknown food-dye soluton is diluted and it's absorbance is found to be 0.65. What is the molarity of the diluted unknown, to two significant figures? Do not type units...
Need help for questions 2 and 4 G. C. 1-7 Determination of the Dye Concentration in...
Need help for questions 2 and 4
G. C. 1-7 Determination of the Dye Concentration in a Powdered Drink G. C. 1-7: PART 2 GROUP DISCUSSION QUESTIONS Lab partners' name: 1. Your TA will provide you with the correct concentration of the dye in the powdered drink solution. Calculate the percentage error for your data. (experimental value - accepted value) accepted value 2. The empirical formula for the Brilliant Blue dye is CanHyN,O,S, Na2 and the formula weight i 79286...
Please help me answer questions from pre-lab homework Aspirin Analysis Lab 1) Calculate the molar concentration...
Please help me answer questions from pre-lab homework
Aspirin Analysis Lab
1) Calculate the molar concentration (molarity) of a 250 mL stock solution prepared from 0.5 g of pure acetylsalicylic acid. 2) Calculate the molar concentration (molarity) of a 50 mL solution prepared from 2.5 mL of the acetylsalicylic acid stock solution from question 1. This will be labeled as Standard Solution A. 3) Simlarly, calculate the molar concentrations (molarities) of 50 mL the four individual solutions prepared from 2,...
Beer’s Law Objective : We will explore an application of absorption spectroscopy using calibration curves and...
Beer’s Law Objective : We will explore an application of absorption spectroscopy using calibration curves and Beer’s Law. Use the “LAB : HOW TO…” link from the class website if you need help with how to use balance, Bunsen burner… and such. Introduction: You may write this information in your lab notebook for your own reference. It can’t be cut and pasted. Different solutions have different spectral properties. In this portion of the experiment those properties will be utilized to...
Name: Determination of Solution Concentration by Spectrophotometry PRELAB QUESTIONS 1. A student measures the absorbance of...
Name: Determination of Solution Concentration by Spectrophotometry PRELAB QUESTIONS 1. A student measures the absorbance of an unknown after placing a sample in a cuvette which contained some water. How will this affect the concentration he reports? 2. Explain why it is all right to leave water in the volumetric flask before you put in the 10.00 mL of your unknown. 3. A 1.3 x 10-M solution of an unknown substance has an absorbance of 0.345 at its max. a)...
Pre-lab: Concentration of Riboflavin 1. The following absorbance spectrum is recorded for a dye. Which is the most likely color of this dye? a. Blue-green b. Colorless c. Red d. Black M stock solution is diluted to 10.00 ml, what is the final 2. If 4.00 mL of a 5.00 x 10 concentration? 3. The absorbance of known concentrations of red food dye were measured in order to generate the following calibration curve. 2. Annotate the graph with the labels...
please help with question 1 and 3 part c
Name: 8 9 Lab Section: 7 Pre-lab: The Concentration of Riboflavin 1. The given absorbance spectrum is recorded for a dye. Which is the most likely color of this dye? a. Blue-green b. Colorless c. Red d. Black M stock solution is diluted to 10.00 ml, what is the final 2. IF 4.00 ml of a 5.00 X 10 concentration? 3. The absorbance of known concentrations of blue food dye were...
Name Lab Section: 1 2 345 6 789 Pre-lab: Concentration of Riboflavin 1. The following absorbance spectrum is recorded for a dye. Which is the most likely color of this dve? a Blue-green b. Colorless c. Red d. Black Wveleneh 2. If 4.00 mL of a 5.00 x 10 M stock solution is diluted to 10,00 ml, what is the final concentration? 3. The absorbance of known concentrations of red food dye were measured in order to generate the following...
Chemistry lab question! Help please!
A student finds a solution of blue dye #2 (another food dye we are not using in this lab) in a 1.0 cm cuvette has a maximum absorbance of 0.572 at 613 nm. The molar extinction coefficient, E, of blue #2 at the same wavelength is 1.21 * 10^4 M^-1 cm^-1. Calculate the concentration of this solution. The same student as in question 3 brings the blue dye #2 solution to her friend Bob to...
Please help I am completely confused, I included the 2
graphs needed for this post lab. Thank you!
Postlab Assignments . (a) Using your own standard curve, the line equation you generated and Beer's law equation Equation 1) calculate the molar absorpivity (e) of blue dye. For all your measurem cuvette used is 1.00 cm. Use this as the value of b in Equation 1 ents, the size of (b) Using Beer's law equation again, what does a high value...
LEILU.23.27 Eugenia Bueso-Alas: Attempt 2 UUTUUU-Dye SD Incorrectly Low Question 3 (20 points) An unknown food-dye is analyzed by the method used in this experiment. The absorbance of 5 standard solutions is plotted vs. their concentration (molarity) and a straight line is obtained with the formula: Abs = 4.350x +0.06 An unknown food-dye soluton is diluted and it's absorbance is found to be 0.65. What is the molarity of the diluted unknown, to two significant figures? Do not type units...
Need help for questions 2 and 4
G. C. 1-7 Determination of the Dye Concentration in a Powdered Drink G. C. 1-7: PART 2 GROUP DISCUSSION QUESTIONS Lab partners' name: 1. Your TA will provide you with the correct concentration of the dye in the powdered drink solution. Calculate the percentage error for your data. (experimental value - accepted value) accepted value 2. The empirical formula for the Brilliant Blue dye is CanHyN,O,S, Na2 and the formula weight i 79286...
Please help me answer questions from pre-lab homework
Aspirin Analysis Lab
1) Calculate the molar concentration (molarity) of a 250 mL stock solution prepared from 0.5 g of pure acetylsalicylic acid. 2) Calculate the molar concentration (molarity) of a 50 mL solution prepared from 2.5 mL of the acetylsalicylic acid stock solution from question 1. This will be labeled as Standard Solution A. 3) Simlarly, calculate the molar concentrations (molarities) of 50 mL the four individual solutions prepared from 2,...
Name: Determination of Solution Concentration by Spectrophotometry PRELAB QUESTIONS 1. A student measures the absorbance of an unknown after placing a sample in a cuvette which contained some water. How will this affect the concentration he reports? 2. Explain why it is all right to leave water in the volumetric flask before you put in the 10.00 mL of your unknown. 3. A 1.3 x 10-M solution of an unknown substance has an absorbance of 0.345 at its max. a)...
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