Homework Answers
Question 1. The correct option should be
The two solutions were violet and red before mixing.
Explanation: From the analysis of the resulting solution, we see that it contains all possible color possible in the visible range. Therefore such combination is only possible if the colors of all the wavelengths are mixed together. Since violet and red belong to the two extremes in the visible range if wavelength, of we mix these two, then only we can expect to obtain all possible color combination.
Question 2.The concentration of the sample is
1.50 ppm.
Explanation: The absorbance and transmitance relation is
A = -log T = -log(0.112) = 0.95.
From the plot, we can see that this value belongs to concentration of 1.5 ppm. So this will be the concentration.
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In a variation on the "secret recipe" part of this lab, one student secretly mixed together...
PROCEDURE A. ABSORBANCE SPECTRA 1. Obtain three cuvettes. Add-2mL of the following samples to them: red...
PROCEDURE A. ABSORBANCE SPECTRA 1. Obtain three cuvettes. Add-2mL of the following samples to them: red dye, blue dye, yellow dye. 2. Obtain a spectrum for each dye according to the provided directions (water is the blank). 3. For each of the three dyes (red, yellow, and blue) record the wavelength for the largest peak in the visible range (380 nm to 750 nm), Record this in the data table below. Save the red dye for part B. 4. Identify...
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...
The electronic absorption spectrum UI (Cr(NH3)6]3+ (aq) is shown in Figure 11.5. One of the...
The electronic absorption spectrum UI (Cr(NH3)6]3+ (aq) is shown in Figure 11.5. One of the observed peaks is centered at about 303 nm. 1.a. What is the approximate value of the wavelength for the two other peaks? Which one of these three peaks falls in the visible region of the electromagnetic spectrum? The wavelength at this peak is (Amax), and this transition accounts for the color of the complex ion in solution. The energy of the transition occurring at...
Suppose a candy company representative daims that colored candies are mixed such that each large production...
Suppose a candy company representative daims that colored candies are mixed such that each large production batch has precisely the following proportions: 10% brown 20 yellow. 20% red, 10% orange, 20 % green, and 20 % blue. The colors present in a sample of 459 candies was recorded. Is the representative's claim about the expected proportions of each color refuted by the data? red green blue Color Number of Candies brown yellow 90 55 orange 44 159 67 44 Copy...
Name: Prelab 1. Find the wavelengths for the different colors of light that make up the...
Name: Prelab 1. Find the wavelengths for the different colors of light that make up the visible (white) light spectrum. You can use your textbook or the internet to find this information. Note which source you used in completing this table. Color Wavelength Range Violet Blue Green Yellow Orange Red 2. Knowing that the FeSCNP complex is red, predict the color of light it absorbs, and determine the range of wavelengths in which you would expect to find its wavelength...
Suppose a candy company representative claims that colored candies are mixed such that each large production...
Suppose a candy company representative claims that colored candies are mixed such that each large production batch has precisely the following proportions: 20% brown, 20% yellow, 10% red, 10% orange, 20% green, and 20% blue. The colors present in a sample of 461 candies was recorded. Is the representative's claim about the expected proportions of each color refuted by the data? Color brown yellow red orange green blue Number of Candies 103 34 115 83 57 69 Step 1. State...
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...
Name Section/CRN EXPERIMENT 9 POTENTIOMETRIC DETERMINATION OF AN EQUILIBRIUM CONSTANT PRE-LABORATORY QUESTIONS The following preparatory questions...
Name Section/CRN EXPERIMENT 9 POTENTIOMETRIC DETERMINATION OF AN EQUILIBRIUM CONSTANT PRE-LABORATORY QUESTIONS The following preparatory questions should be answered before coming to lab. They are intended to introduce you to several jdeas that are important to aspects of the experiment. You must turn in your work to your instructor before you will be allowed to begin the experiment. Potassium acid phthalate, KHP (KHC4H&O4), is a primary standard reagent used to determine exactly the concentration of a solution of base, such...
need hep with these two questions! here is the information for the lab K2Cr₂O + H₂...
need hep with these two questions!
here is the information for the lab
K2Cr₂O + H₂ C₂04 2H2O sklor (C204) [H202₂/2 H2otca 2k12 2 cr=x2 (+8ly kzcrgo7+ I 142 C204-21420 2 k cellow). (1) 2 - 2 H2O toc -=S7 30-4521 2. Calculate the theoretical yield of K[Cr(C,0.),(H,0), 2H,0. 3. What is the theoretical percentage by weight of Cr in K[Cr(C,0.),(H,0), 2H,0? using the spectrophotometer at your desk, at the wavelength of maximum absorbance of the blue-green chromium ion, measure...
CHM130LL Lab 12 - Exploring Indicators Name: MEID Complete the following items by typing into the...
CHM130LL Lab 12 - Exploring Indicators Name: MEID Complete the following items by typing into the text box provided. The boxes will increase in size if additional space is necessary. Please be sure to save all your work as an MS Word document to submit properly. Part I - Calibration of Red Cabbage Juice Indicator A. Data Table 1: Calibration of Red Cabbage Juice Indicator with a Base Fill in the data table. Since your goal is to add sufficient...
PROCEDURE A. ABSORBANCE SPECTRA 1. Obtain three cuvettes. Add-2mL of the following samples to them: red dye, blue dye, yellow dye. 2. Obtain a spectrum for each dye according to the provided directions (water is the blank). 3. For each of the three dyes (red, yellow, and blue) record the wavelength for the largest peak in the visible range (380 nm to 750 nm), Record this in the data table below. Save the red dye for part B. 4. Identify...
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...
The electronic absorption spectrum UI (Cr(NH3)6]3+ (aq) is shown in Figure 11.5. One of the observed peaks is centered at about 303 nm. 1.a. What is the approximate value of the wavelength for the two other peaks? Which one of these three peaks falls in the visible region of the electromagnetic spectrum? The wavelength at this peak is (Amax), and this transition accounts for the color of the complex ion in solution. The energy of the transition occurring at...
Suppose a candy company representative daims that colored candies are mixed such that each large production batch has precisely the following proportions: 10% brown 20 yellow. 20% red, 10% orange, 20 % green, and 20 % blue. The colors present in a sample of 459 candies was recorded. Is the representative's claim about the expected proportions of each color refuted by the data? red green blue Color Number of Candies brown yellow 90 55 orange 44 159 67 44 Copy...
Name: Prelab 1. Find the wavelengths for the different colors of light that make up the visible (white) light spectrum. You can use your textbook or the internet to find this information. Note which source you used in completing this table. Color Wavelength Range Violet Blue Green Yellow Orange Red 2. Knowing that the FeSCNP complex is red, predict the color of light it absorbs, and determine the range of wavelengths in which you would expect to find its wavelength...
Suppose a candy company representative claims that colored candies are mixed such that each large production batch has precisely the following proportions: 20% brown, 20% yellow, 10% red, 10% orange, 20% green, and 20% blue. The colors present in a sample of 461 candies was recorded. Is the representative's claim about the expected proportions of each color refuted by the data? Color brown yellow red orange green blue Number of Candies 103 34 115 83 57 69 Step 1. State...
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...
Name Section/CRN EXPERIMENT 9 POTENTIOMETRIC DETERMINATION OF AN EQUILIBRIUM CONSTANT PRE-LABORATORY QUESTIONS The following preparatory questions should be answered before coming to lab. They are intended to introduce you to several jdeas that are important to aspects of the experiment. You must turn in your work to your instructor before you will be allowed to begin the experiment. Potassium acid phthalate, KHP (KHC4H&O4), is a primary standard reagent used to determine exactly the concentration of a solution of base, such...
need hep with these two questions!
here is the information for the lab
K2Cr₂O + H₂ C₂04 2H2O sklor (C204) [H202₂/2 H2otca 2k12 2 cr=x2 (+8ly kzcrgo7+ I 142 C204-21420 2 k cellow). (1) 2 - 2 H2O toc -=S7 30-4521 2. Calculate the theoretical yield of K[Cr(C,0.),(H,0), 2H,0. 3. What is the theoretical percentage by weight of Cr in K[Cr(C,0.),(H,0), 2H,0? using the spectrophotometer at your desk, at the wavelength of maximum absorbance of the blue-green chromium ion, measure...
CHM130LL Lab 12 - Exploring Indicators Name: MEID Complete the following items by typing into the text box provided. The boxes will increase in size if additional space is necessary. Please be sure to save all your work as an MS Word document to submit properly. Part I - Calibration of Red Cabbage Juice Indicator A. Data Table 1: Calibration of Red Cabbage Juice Indicator with a Base Fill in the data table. Since your goal is to add sufficient...
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