Homework Answers
Crystal violet is a common, beautiful purple dye. In strongly basic solutions, the bright color of the dye slowly fades and the solution becomes colorless .hence
option 3 and option 2 are correct .
option 2 is correct because as intensity of color of crystal violet will decrease the absorption will decrease and hence eventually the intensity of the transmitted light will increase.hence Transmittance will increase.
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Question 1 -- /1 The reaction described in the manual involves crystal violet which is purple...
A student measures the absorbance of a solution at some point during the reaction and records...
A student measures the absorbance of a solution at some point during the reaction and records a value of 0.335 . (Note that absorbance has no units.) Use Beer's Law and the constants given on page 5 to calculate the concentration of crystal violet in this solution. *The relationship between the solution absorbance and the CV+ concentration can be written as shown in Equation 7 below (Beer’s Law). At = ε∙b∙ct [7] In Equation 7, At is the reaction solution...
please help with ALL Spectrophotometry and Beer's Law Spenglerenga Prelald MT RE 1. Write the mathematical...
please help with ALL
Spectrophotometry and Beer's Law Spenglerenga Prelald MT RE 1. Write the mathematical expression for Beer's law and explain each symbol in the expression 2. Use Figure 7.2 to estimate the approximate wavelength of maximum absorption for an aque- ous solution of each of the following: a. Hemoglobin (the molecule that gives blood its color) b. Chlorophyll (the pigment that gives algae their color) 3. Fill in the following for the correspondence between % transmittance and absorbance:...
Based on table 1, why Lmax shifts towards higher wavelengths when you go from ethylene to...
Based on table 1,
why Lmax shifts towards higher wavelengths when you go from
ethylene to b-carotene?
Figure 1. violet blue green yellow orange red purple 500 800 nm The greater the degree of conjugation of chromophores the greater the chance that the absorption of light will occur at higher wavelengths. Table 1 illustrates the effect of conjugation (where max gives the wavelength of maximum absorption): # of conjugated double bonds 175 Table 1. Compound Ethylene 1,3-Butadiene 1.3.5-Hexatricne B-Carotene 258...
1. Draw the boundaries for the va below: es for the various ranges of colors of...
1. Draw the boundaries for the va below: es for the various ranges of colors of visible of colors of visible light on the waveleriyle 750 nm 400 nm 700 nm 500 nm 600 nm 2. Below is an absorbance spectrum for a violet/purple the color scale you drew in Question 1, wh dye? Which color(s) is/are most transmitted? plet/purple dye called crystal violet. According to or(s) is/are most absorbed by the violet Absorbance 600 100 500 Wavelength, nm 3....
1. Draw the boundaries for the various ta below: bus ranges of colors of visible light on the wa le light on the w...
1. Draw the boundaries for the various ta below: bus ranges of colors of visible light on the wa le light on the wavelelige 750 nm 400 nm 700 nm 500 nm 600 nm 2. Below is an absorbance spectrum for a violet/purple the color scale you drew in Question 1, wn dye? Which color(s) is/are most transmitted? olet/purple dye called crystal violet. According to Ich color(s) is/are most absorbed by the violet Absorbance 600 300 400 500 Wavelength, nm...
answers for this pre/post lab Name: Date: Lab Section Colorimetric Pre/Postlab Questions 1. What iron species...
answers for this pre/post lab
Name: Date: Lab Section Colorimetric Pre/Postlab Questions 1. What iron species give rise to the orange color upon addition of 1,10-phenanthroline to an iron(II) solution? 2. How are percent transmittance and absorbance related algebraically? (Be able to convert %T to 4 and 4 to %7:) 3. What are the five fundamental components of a spectrophotometer? 4. State and define all terms (including units) in the Beer-Lambert law. 5. What is the purpose of preparing a...
2. Below the color scale you dow n , which is e the dye measured at...
2. Below the color scale you dow n , which is e the dye measured at different so m Apply ad the whole different between th dyes COVERI A NAD NADH Laboratory Report 10 OM DORD 1. Draw the boundaries for the various ta below: bus ranges of colors of visible light on the wa le light on the wavelelige 750 nm 400 nm 700 nm 500 nm 600 nm 2. Below is an absorbance spectrum for a violet/purple the...
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...
1. For calculating the pH of 0.01010 M KH PO., which of the following strategies is...
1. For calculating the pH of 0.01010 M KH PO., which of the following strategies is correct? A. Treat as monoprotic acid system and use Kai B. Treat as monoprotic acid system and use Kaz C. Treat as amphiprotic system and use Ka, and Kaz D. Treat as amphiprotic system and use Kaz and Kaz 2. A 0.100 M NaOH solution is used for titrating an 0.0750 M acetic acid solution (pKa-4.76). What is the pH of the solution when...
Alkyl halides may undergo elimination reactions with BrØnstead-Lowry bases in which the halide and an adjacent...
Alkyl halides may undergo elimination reactions with BrØnstead-Lowry bases in which the halide and an adjacent proton are lost to form a new π bond. Because of the loss of a proton and a halide anion the reactions are termed ‘dehydrohalogenation’. The two most common associated mechanisms are designated as either unimolecular (E1) or bimolecular (E2) elimination reactions based on reaction rate studies. E1 reactions proceed via a two-step mechanism that involves the cleavage of the leaving group (here the...
please help with ALL
Spectrophotometry and Beer's Law Spenglerenga Prelald MT RE 1. Write the mathematical expression for Beer's law and explain each symbol in the expression 2. Use Figure 7.2 to estimate the approximate wavelength of maximum absorption for an aque- ous solution of each of the following: a. Hemoglobin (the molecule that gives blood its color) b. Chlorophyll (the pigment that gives algae their color) 3. Fill in the following for the correspondence between % transmittance and absorbance:...
Based on table 1,
why Lmax shifts towards higher wavelengths when you go from
ethylene to b-carotene?
Figure 1. violet blue green yellow orange red purple 500 800 nm The greater the degree of conjugation of chromophores the greater the chance that the absorption of light will occur at higher wavelengths. Table 1 illustrates the effect of conjugation (where max gives the wavelength of maximum absorption): # of conjugated double bonds 175 Table 1. Compound Ethylene 1,3-Butadiene 1.3.5-Hexatricne B-Carotene 258...
1. Draw the boundaries for the va below: es for the various ranges of colors of visible of colors of visible light on the waveleriyle 750 nm 400 nm 700 nm 500 nm 600 nm 2. Below is an absorbance spectrum for a violet/purple the color scale you drew in Question 1, wh dye? Which color(s) is/are most transmitted? plet/purple dye called crystal violet. According to or(s) is/are most absorbed by the violet Absorbance 600 100 500 Wavelength, nm 3....
1. Draw the boundaries for the various ta below: bus ranges of colors of visible light on the wa le light on the wavelelige 750 nm 400 nm 700 nm 500 nm 600 nm 2. Below is an absorbance spectrum for a violet/purple the color scale you drew in Question 1, wn dye? Which color(s) is/are most transmitted? olet/purple dye called crystal violet. According to Ich color(s) is/are most absorbed by the violet Absorbance 600 300 400 500 Wavelength, nm...
answers for this pre/post lab
Name: Date: Lab Section Colorimetric Pre/Postlab Questions 1. What iron species give rise to the orange color upon addition of 1,10-phenanthroline to an iron(II) solution? 2. How are percent transmittance and absorbance related algebraically? (Be able to convert %T to 4 and 4 to %7:) 3. What are the five fundamental components of a spectrophotometer? 4. State and define all terms (including units) in the Beer-Lambert law. 5. What is the purpose of preparing a...
2. Below the color scale you dow n , which is e the dye measured at different so m Apply ad the whole different between th dyes COVERI A NAD NADH Laboratory Report 10 OM DORD 1. Draw the boundaries for the various ta below: bus ranges of colors of visible light on the wa le light on the wavelelige 750 nm 400 nm 700 nm 500 nm 600 nm 2. Below is an absorbance spectrum for a violet/purple the...
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...
1. For calculating the pH of 0.01010 M KH PO., which of the following strategies is correct? A. Treat as monoprotic acid system and use Kai B. Treat as monoprotic acid system and use Kaz C. Treat as amphiprotic system and use Ka, and Kaz D. Treat as amphiprotic system and use Kaz and Kaz 2. A 0.100 M NaOH solution is used for titrating an 0.0750 M acetic acid solution (pKa-4.76). What is the pH of the solution when...
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