1. Define λmax and explain why it is desirable to do the experimental procedure at λmax?...
1. Define λmax and explain why it is desirable to do the experimental procedure at λmax?
2. around what absorbance would you expect the λmax to be with each color solution? (Blue, green, red, yellow)
3. a pipet is used to make the solution dilutions in lab. suppose in making the dilution, additional distilled water is accidentally added. Will the concentration of the solution be higher or lower that disered? explain.
Homework Answers
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1. Define λmax and explain why it is desirable to do
the experimental procedure at λmax?...
In a variation on the "secret recipe" part of this lab, one student secretly mixed together...
In a variation on the "secret recipe" part of this lab, one student secretly mixed together two different colors of solution and gave the mixture to another student to analyze. The student placed the sample in the MicroLab spectrophotometer and obtained the following graph of absorbance vs. wavelength. absorbance 400 430 460 500 540 580 620 660 700 viol indg blue grn gr-yel yel org red red wavelength (nm) Which two colors had the first student secretly mixed together? I.e....
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...
JIJ UIUJCCI Sampie Prelab assignment (20%) 1) Based on the formulae below, explain in few words...
JIJ UIUJCCI Sampie Prelab assignment (20%) 1) Based on the formulae below, explain in few words how is the enersy of light related to the wavelength, energy of the light wavelength Speed of light frequency of the light Erhv frequency Purd's constant 2) Which light between red and blue has the higher frequency? 3) The Amex of Mno, is 525 nm. What color of the visible spectrum does correspond to this wavelength? (use the visible spectrum image provided on canvas)....
3. Explain the series of color changes that can occur on thymol blue indicator by the...
3. Explain the series of color changes that can occur on thymol blue indicator by the addition of the following solutions. In each case, give the approximate pH of the solution Color change Red to Yellow Yellow to Blue pH range 12 to 2.8 Thymol blue 8.2 to 9.1 a) A few drops of thymol blue are added to 0.1 M aqueous solution of HCl(aq). b) By adding some solid sodium acetate, NaCH,O2 to a solution of (a) e) By...
PRE-LABORATORY QUESTIONS NAME: 1. According to the experimental procedure written above which cation in your sample...
PRE-LABORATORY QUESTIONS NAME: 1. According to the experimental procedure written above which cation in your sample should be identified first if it is indeed in the sample? 2. In what phase is the first cation supposed to be identified, in solid or liquid phase? And in what color? 3. According to the experimental procedure written above which cation in your sample should be identified second if it is indeed in the sample? 4. In what phase is the second cation...
In the future, what do you think will be the primary source of energy for transportation...
In
the future, what do you think will be the primary source of energy
for transportation and electricity?
I have this chemistry HW and I need help with these 3
questions (question 13, 15 and 16)
13) In the future, (eg, 2037), what do you think ill be the primary sources of energy for a. Transportation? b. Electricity? Explain and justify. Provide any references you've used to arrive at your answer. A good starting reference is McQuarrie, interchapter L. 15)...
Experimental Procedure, Part B.1. What is the purpose of adding NaHCO, to the reaction mixture? Explain....
Experimental Procedure, Part B.1. What is the purpose of adding NaHCO, to the reaction mixture? Explain. Write a balanced equation for its reaction. a. Experimental Procedure, Part C. What is the oxidizing agent in the titration? b. What is the color change of the starch indicator that signals the stoichiometric point in Part C? (1. Vitamin C is a reducing agent and antioxidant. What ion does it reduce in this experiment? Explain. Desk No. IOS- Experimental Procedure, Part A.1. Determine...
PROCEDURE Table 4.1: Dilutions of Albumin for Standard Curve Determination. SAMPLE NUMBER VOLUME OF 0.9% NACL...
PROCEDURE Table 4.1: Dilutions of Albumin for Standard Curve Determination. SAMPLE NUMBER VOLUME OF 0.9% NACL (mL) VOLUME OF 10 mg/ml ALBUMIN STOCK SOLUTION (mL) VOLUME OF BIURET REAGENT (mL) TOTAL VOLUME IN EACH TUBE ABSORBANCE READING ALBUMIN CONCENTRATION IN SOLUTION 1 (Blank) 1.0 mL OmL 4.0 mL 0.8 mL 0.2 mL 4.0 mL .4 0.6 mL 0.4 mL 4.0 mL 5 mL 5ml sme 5mL 5ml 5mL .228 .088 1 0.271 773 1.444 11827 0.4 mL 0.6 mL 4.0...
Experiment 17A. A Solubility Product Constant Procedure Getting Started 1. Obtain a 10 ml pipet, ...
question#1
Experiment 17A. A Solubility Product Constant Procedure Getting Started 1. Obtain a 10 ml pipet, a 50 mL buret, and 2 pieces of 120 cm filter paper Preparing Saturated Solutions of M10J MIO), is an insoluble divalent iodate salt. The identity of the cation M-is unknown. 1 Prepare MIO,), by adding S0 ml of o.2 M KIO, to 20 mL of 1 Molar M(NO,J, in a 150 mt 2. Stir the mixture vigorously with a stirring rod. A white,...
How do I make a line of best fit (regression) with the following data? I am...
How do I make a line of best fit (regression) with the
following data? I am aware of how to make it in Microsoft Excel,
but I am having trouble figuring out how to find my x value for
making the graph. Y value is absorbance, what do I use for x value
to calculate the slope?
Tube 0.5 mM sulfide standard (ml) Sulfide amount (umol) Sulfide reagent (ml) 0.0 4.9 0.11 0.00 0.2 FeCl3 dH2O to Absorbance 10ml total...
In a variation on the "secret recipe" part of this lab, one student secretly mixed together two different colors of solution and gave the mixture to another student to analyze. The student placed the sample in the MicroLab spectrophotometer and obtained the following graph of absorbance vs. wavelength. absorbance 400 430 460 500 540 580 620 660 700 viol indg blue grn gr-yel yel org red red wavelength (nm) Which two colors had the first student secretly mixed together? I.e....
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...
JIJ UIUJCCI Sampie Prelab assignment (20%) 1) Based on the formulae below, explain in few words how is the enersy of light related to the wavelength, energy of the light wavelength Speed of light frequency of the light Erhv frequency Purd's constant 2) Which light between red and blue has the higher frequency? 3) The Amex of Mno, is 525 nm. What color of the visible spectrum does correspond to this wavelength? (use the visible spectrum image provided on canvas)....
3. Explain the series of color changes that can occur on thymol blue indicator by the addition of the following solutions. In each case, give the approximate pH of the solution Color change Red to Yellow Yellow to Blue pH range 12 to 2.8 Thymol blue 8.2 to 9.1 a) A few drops of thymol blue are added to 0.1 M aqueous solution of HCl(aq). b) By adding some solid sodium acetate, NaCH,O2 to a solution of (a) e) By...
PRE-LABORATORY QUESTIONS NAME: 1. According to the experimental procedure written above which cation in your sample should be identified first if it is indeed in the sample? 2. In what phase is the first cation supposed to be identified, in solid or liquid phase? And in what color? 3. According to the experimental procedure written above which cation in your sample should be identified second if it is indeed in the sample? 4. In what phase is the second cation...
In
the future, what do you think will be the primary source of energy
for transportation and electricity?
I have this chemistry HW and I need help with these 3
questions (question 13, 15 and 16)
13) In the future, (eg, 2037), what do you think ill be the primary sources of energy for a. Transportation? b. Electricity? Explain and justify. Provide any references you've used to arrive at your answer. A good starting reference is McQuarrie, interchapter L. 15)...
Experimental Procedure, Part B.1. What is the purpose of adding NaHCO, to the reaction mixture? Explain. Write a balanced equation for its reaction. a. Experimental Procedure, Part C. What is the oxidizing agent in the titration? b. What is the color change of the starch indicator that signals the stoichiometric point in Part C? (1. Vitamin C is a reducing agent and antioxidant. What ion does it reduce in this experiment? Explain. Desk No. IOS- Experimental Procedure, Part A.1. Determine...
PROCEDURE Table 4.1: Dilutions of Albumin for Standard Curve Determination. SAMPLE NUMBER VOLUME OF 0.9% NACL (mL) VOLUME OF 10 mg/ml ALBUMIN STOCK SOLUTION (mL) VOLUME OF BIURET REAGENT (mL) TOTAL VOLUME IN EACH TUBE ABSORBANCE READING ALBUMIN CONCENTRATION IN SOLUTION 1 (Blank) 1.0 mL OmL 4.0 mL 0.8 mL 0.2 mL 4.0 mL .4 0.6 mL 0.4 mL 4.0 mL 5 mL 5ml sme 5mL 5ml 5mL .228 .088 1 0.271 773 1.444 11827 0.4 mL 0.6 mL 4.0...
question#1
Experiment 17A. A Solubility Product Constant Procedure Getting Started 1. Obtain a 10 ml pipet, a 50 mL buret, and 2 pieces of 120 cm filter paper Preparing Saturated Solutions of M10J MIO), is an insoluble divalent iodate salt. The identity of the cation M-is unknown. 1 Prepare MIO,), by adding S0 ml of o.2 M KIO, to 20 mL of 1 Molar M(NO,J, in a 150 mt 2. Stir the mixture vigorously with a stirring rod. A white,...
How do I make a line of best fit (regression) with the
following data? I am aware of how to make it in Microsoft Excel,
but I am having trouble figuring out how to find my x value for
making the graph. Y value is absorbance, what do I use for x value
to calculate the slope?
Tube 0.5 mM sulfide standard (ml) Sulfide amount (umol) Sulfide reagent (ml) 0.0 4.9 0.11 0.00 0.2 FeCl3 dH2O to Absorbance 10ml total...
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