Homework Answers
ANSWER:
Your linear least-squares line is
this means that, the equation could be rewritten as
To convert absorbance values into concentration, we solve the previous concentration for [dye]:
Add Answer to:
Solve best-fit equation to derive an expression to convert absorbance values to concentrations Solve the best...
- Creating Solutions of Standard Molarity Having the measured absorbance of the made solutions, calculate th...
- Creating Solutions of Standard Molarity Having the measured absorbance of the made solutions, calculate the ACTUAL concentration of each solution (HINT: Use the equation of the line of best fit ob- Lained from Excel: A mM + b solve the equation for molarity M in terms of the absorbance A: slope, m; and intercept with the vertical axis b. Show your work.) Table 12-5. Comparison between the theoretical and actual concentration of the made Cul solutions Absorbance Actual Concentration...
PLEASE HELP! How would you solve for concentration (X) using the best fit line from the...
PLEASE HELP! How would you solve for concentration (X)
using the best fit line from the graph?
Table 1: Red 40 Dye Solution [Red 40), M 0.1000 0.0800 0.0500 0.0200 0.0000 Absorbance, AU 0.348 0.295 0.147 0.075 0 Blank Analytical A, nm: Unknown No: Unknown Abs: Slope of B-L Plot: Int'pt of Plot: [Red 40) in unk: 501.9 B-74 0.792 3.529 -0.00347 Absorbance (AU) vs [Red 40] (M) 0.4 0.35 y = 3.5294x -0.0035 R2 = 0.9882 0.3 Absorbance (AU)...
please help with parts a. and #3 Concentration of blue dye Absorbance a. Calculate the slope and y-intercept for...
please help with parts a. and #3
Concentration of blue dye Absorbance a. Calculate the slope and y-intercept for the line of best fit. Show your work and include units. (1.6810 0.201) (4.0x10L, 6.510) 8.0 x 10 0.100 1.6 x 100 .201 1.3 x 165, 2.4 x 10 0.302 3.2 x 10 0.403 0.510 moY₂-Y, (0.510-0.201) 0.309 Xxx (4.0x104-1.6x10on) - 24010" Ymyib b: 0.2-01 -(1.3 x U'M (1.6 X 10M buy-m+ b 0.201- 0.204 slope: 1.3x105 m y-intercept: -0.007 4.0...
Your professor created a standard curve with a best-fit line. The equation of the line is...
Your professor created a standard curve with a best-fit line. The equation of the line is y=0.245x+0.342. a) Calculate the concentration (in %) for the following absorbance values. 0.342, 3.861, 1.462 b) What absorbance would you expect to measure for the following concentrations 18%, 4%, 50% c) Draw a graph of the best fit line. Include three errors on the graph. Explain what those errors are and then explain how you would fix those errors to make the graph more...
PLEASE HELP! 1. Solve for concentration (x) using your best fit line from the graph (y=mx+b) 2....
PLEASE HELP!
1. Solve for concentration (x) using your best fit
line from the graph (y=mx+b)
2. What is the concentration of your unknown solution in
mM?
3. What is the molar absorptivity (ϵ) of the drink mix? (In
units of mM-1 cm-1)
Table 1: Red 40 Dye Solution [Red 40), M 0.1000 0.0800 0.0500 0.0200 0.0000 Absorbance, AU 0.348 0.295 0.147 0.075 0 Blank Analytical A, nm: Unknown No: Unknown Abs: Slope of B-L Plot: Int'pt of Plot: [Red 40)...
Section 1 Tube [FeSCN^+] M Absorbance 1 0.0005 0.016 2 0.0011 0.0422 3 0.00367 0.0917 4...
Section 1 Tube [FeSCN^+] M Absorbance 1 0.0005 0.016 2 0.0011 0.0422 3 0.00367 0.0917 4 0.00727 0.224 5 0.00965 0.267 6 0.0137 0.398 Part B unknown sol. 0.175 SCENARIO: Five standard solutions containing different known concentrations of an iron (II) thiocyanate (FeSCN+ ) complex are analyzed using spectrophotometry, a technique which measures the quantity of light absorbed by the solution as a function of the concentration of the analyte in solution (in this case, FeSCN+ ). The results of...
Table 1. Concentrations of [Fe(Phen),1?, M, in water and UV- vis absorbance values recorded at 2...
Table 1. Concentrations of [Fe(Phen),1?, M, in water and UV- vis absorbance values recorded at 2 -505 nm. Concentration of [Fe(Phen)/, M Absorbance 9.500 x 10 0.999 4.250 x 10 0.480 0.219 2.125 10% 1.063 x 10 0.104 0.000 0.003 Table 2. UV-vis absorbance values of [Fe(phen)]* held at 35 °C after mixing with H SO, and recorded at 5 minute intervals (in water at max = 505 nm). Time (minutes) Absorbance 0.997 0.935 0.877 0.823 0.772 0.724 0.680 0.638...
. Determination of an equilibrium constant Use the calculated absorbance values from Table 4 in Part...
. Determination of an equilibrium constant Use the calculated absorbance values from Table 4 in Part II (y values and the best-fit line equation from Part I to calculate the [FeSCN2"), at equilibrium. Show two sets of calculations and complete Table 6 below. Sample Calculation with hypothetical values of Absorbance from Table 4 & fitted egn. from Table 3 y = mx + b (y is absorbance) 0.0620 - 2000x -0.0250 x-0.0620+ 0.0250 2000 = 4.35 x 10 с D...
How do I do 4? g 16 Mea G vvere BBIng 6 Calculate the concentratio ou...
How do I do 4?
g 16 Mea G vvere BBIng 6 Calculate the concentratio ou T8 Mea edu/webapps/blackboard/execute/contentUfle emdsviewßlcontent id- 2321484 1Bcourse id- 200660. I concentratio m .İd»-2321484-1&course,id-,200660 . nOW wouia you make zu mc or a 37% metnyiene oiue soiutio n wnen you nave a solution witn a starung concentration of 50%? (025 points) 3 How would you make 10 mL of a 0.25% methylene blue solution when you have a solution with a starting concentration of 75%?...
A group of physics students collected data from a test of the projectile motion problem that...
A group of physics students collected data from a test of the projectile motion problem that was analyzed in a previous lab exercise (L5). In their test, the students varied the angle and initial velocity Vo at which the projectile was launched, and then measured the resulting time of flight (tright). Note that tright was the dependent variable, while and Vo were independent variables. The results are listed below. (degrees) Time of Flight (s) Initial Velocity V. (m/s) 15 20...
- Creating Solutions of Standard Molarity Having the measured absorbance of the made solutions, calculate the ACTUAL concentration of each solution (HINT: Use the equation of the line of best fit ob- Lained from Excel: A mM + b solve the equation for molarity M in terms of the absorbance A: slope, m; and intercept with the vertical axis b. Show your work.) Table 12-5. Comparison between the theoretical and actual concentration of the made Cul solutions Absorbance Actual Concentration...
PLEASE HELP! How would you solve for concentration (X)
using the best fit line from the graph?
Table 1: Red 40 Dye Solution [Red 40), M 0.1000 0.0800 0.0500 0.0200 0.0000 Absorbance, AU 0.348 0.295 0.147 0.075 0 Blank Analytical A, nm: Unknown No: Unknown Abs: Slope of B-L Plot: Int'pt of Plot: [Red 40) in unk: 501.9 B-74 0.792 3.529 -0.00347 Absorbance (AU) vs [Red 40] (M) 0.4 0.35 y = 3.5294x -0.0035 R2 = 0.9882 0.3 Absorbance (AU)...
please help with parts a. and #3
Concentration of blue dye Absorbance a. Calculate the slope and y-intercept for the line of best fit. Show your work and include units. (1.6810 0.201) (4.0x10L, 6.510) 8.0 x 10 0.100 1.6 x 100 .201 1.3 x 165, 2.4 x 10 0.302 3.2 x 10 0.403 0.510 moY₂-Y, (0.510-0.201) 0.309 Xxx (4.0x104-1.6x10on) - 24010" Ymyib b: 0.2-01 -(1.3 x U'M (1.6 X 10M buy-m+ b 0.201- 0.204 slope: 1.3x105 m y-intercept: -0.007 4.0...
PLEASE HELP!
1. Solve for concentration (x) using your best fit
line from the graph (y=mx+b)
2. What is the concentration of your unknown solution in
mM?
3. What is the molar absorptivity (ϵ) of the drink mix? (In
units of mM-1 cm-1)
Table 1: Red 40 Dye Solution [Red 40), M 0.1000 0.0800 0.0500 0.0200 0.0000 Absorbance, AU 0.348 0.295 0.147 0.075 0 Blank Analytical A, nm: Unknown No: Unknown Abs: Slope of B-L Plot: Int'pt of Plot: [Red 40)...
Table 1. Concentrations of [Fe(Phen),1?, M, in water and UV- vis absorbance values recorded at 2 -505 nm. Concentration of [Fe(Phen)/, M Absorbance 9.500 x 10 0.999 4.250 x 10 0.480 0.219 2.125 10% 1.063 x 10 0.104 0.000 0.003 Table 2. UV-vis absorbance values of [Fe(phen)]* held at 35 °C after mixing with H SO, and recorded at 5 minute intervals (in water at max = 505 nm). Time (minutes) Absorbance 0.997 0.935 0.877 0.823 0.772 0.724 0.680 0.638...
. Determination of an equilibrium constant Use the calculated absorbance values from Table 4 in Part II (y values and the best-fit line equation from Part I to calculate the [FeSCN2"), at equilibrium. Show two sets of calculations and complete Table 6 below. Sample Calculation with hypothetical values of Absorbance from Table 4 & fitted egn. from Table 3 y = mx + b (y is absorbance) 0.0620 - 2000x -0.0250 x-0.0620+ 0.0250 2000 = 4.35 x 10 с D...
How do I do 4?
g 16 Mea G vvere BBIng 6 Calculate the concentratio ou T8 Mea edu/webapps/blackboard/execute/contentUfle emdsviewßlcontent id- 2321484 1Bcourse id- 200660. I concentratio m .İd»-2321484-1&course,id-,200660 . nOW wouia you make zu mc or a 37% metnyiene oiue soiutio n wnen you nave a solution witn a starung concentration of 50%? (025 points) 3 How would you make 10 mL of a 0.25% methylene blue solution when you have a solution with a starting concentration of 75%?...
A group of physics students collected data from a test of the projectile motion problem that was analyzed in a previous lab exercise (L5). In their test, the students varied the angle and initial velocity Vo at which the projectile was launched, and then measured the resulting time of flight (tright). Note that tright was the dependent variable, while and Vo were independent variables. The results are listed below. (degrees) Time of Flight (s) Initial Velocity V. (m/s) 15 20...
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