Homework Answers
Graph is drawn between Absorbance Vs Concentration in mM (milliMolar) :
The concentration of solution of Cobalt chloride (CoCl2) whose absorbance is 0.45 is 124 mM by extrapolating the graph between the given above data
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4. At 548 nm the absorbance of 4 solutions of CoCl2 were measured at different concentrations....
1. A series of solutions, containing cobalt (I1) chloride were prepared with concentrations shown below. Using...
1. A series of solutions, containing cobalt (I1) chloride were prepared with concentrations shown below. Using PhET Simulation find the absorbance values corresponding to each solution at the preset value of wave length 549 nm, using 1 cm wide cuvette. Concentration of Co (II), mM 121 98.0 60.0 24.0 15.0 Absorbance Plot a calibration line Absorbance versus Concentration. From the graph determine the specific absorptivity. 2. Using the data you obtained from the graph in the previous problem determine the...
3. The absorbance of known concentrations of red food dye were measured in order to generate the following calibrati...
3. The absorbance of known concentrations of red food dye were measured in order to generate the following calibration curve. a. Annotate the graph with the labels and units of the x and y axes. Also add an appropriate title. b. Imagine a red food dye solution of unknown concentration was found to have an absorbance of 0.80. Using the calibration curve, estimate the concentration of the unknown dye solution. 2.00E- 3 4 .00E-3 6.00E-3 8.00E-3 1.00E-2 193
Please show calculations for all 4 trials 3cer's law states that the absorbance of a solution...
Please show calculations for all 4 trials
3cer's law states that the absorbance of a solution is directly proportional to the molar Concentration of a solution. If you plot absorbance versus molar concentration (molarity), the esulting graph yields a straight line. The equation for the straight line can be used to determine he concentration of an unknown solution from a measurement of its absorbance. You need to prepare 10.0 mL of diluted Cuso, solutions with the concentrations listed for Trials...
Determination of Phosphate in Water Out-of-Class Exercise 4. Use Data Set I t o answer the following questions a)...
Determination of Phosphate in Water Out-of-Class Exercise 4. Use Data Set I t o answer the following questions a) Make a plot of absorbance versus concentration for the data set. Draw the best straight line or smooth curve (whichever is appropriate). Put the absorbance on the yaxis and concentration on the cas. b) Make a plot of % transmittance versus concentration for the data set. Draw the best straight line or smooth curve (whichever is appropriate). Put the transmittance on...
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...
Grade: DETERMINATION OF PHOSPHATE IN WATER 1. Option What is the concentration of phosphate in the...
Grade: DETERMINATION OF PHOSPHATE IN WATER 1. Option What is the concentration of phosphate in the original lake water sample if the unknown lake water sample in the option had been diluted by taking 25.0 mL of lake water and diluting it to the indicated final volume? 21.comgy 2. Option Water treatment plants must reduce phosphate levels to 3.2 micromoles PO 3-/L before the water is considered drinkable. If water from Lake Pontchartrain is determined to have a phosphate concentration...
Can't figure out the concentration of the complex of solns. 10, 11, 12, 13, & 14. Modern...
Can't figure out the concentration of the complex of
solns. 10, 11, 12, 13, & 14.
Modern Experimental Chemistry Chemistry 153 The Iron(III) Thiocyanate Complex Purpose of the Experiment To determine the chemical formula of a complex ion and measure its formation equilibrium constant Equipment Spectro Vis spectrophotometer and LabQuest, cuvette, 25-mL buret (3), ring stand, buret clamp (2), 50-mL beaker (3), small plastic beakers Reagents SCN, as KSCN, 0.00200 M solution Fe; as Fe(NO), 0.00200 M solution and a...
7. The Absorption Spectrum of Cobalt(II) Chloride Procedure Getting Started 1. Your laboratory instructor may ask...
7. The Absorption Spectrum of Cobalt(II) Chloride Procedure Getting Started 1. Your laboratory instructor may ask that you work in groups rather than alone. 2. Obtain directions from your laboratory instructor for discarding the solutions that you will use in'! this experiment. 3. Obtain instructions for using your spectrophotometer. 4. Obtain your unknown. Making the Measurements 1. Mark each of 7 dry 18 x 150-mm test tubes with one of a series of identification numbers running from 1 to 7....
3. Use the below tables to complete lab calculations on the worksheet on pages 2-6 of...
3. Use the below tables to complete lab calculations on the worksheet on pages 2-6 of this document. You will submit the worksheet via dropbox on Canvas by you assigned lab time the week of March 30th through April 3rd. A document with sample calculations of different concentrations is provided to you on canvas. Enzyme Kinetics Lab Buffer volume (mL) Enzyme Volume (ml) Substrate Volume (ml) TOTAL VOLUME (mL) 0.04 0.5 1.5 0.04 0.25 1.5 0.04 0.1 1.5 0.04 0.05...
help please? this was the only other information given REPORT SHEET Determination of the Solubility-Product Constant...
help please?
this was the only other information given
REPORT SHEET Determination of the Solubility-Product Constant for a Sparingly Soluble Salt EXPERIMENT 8 A. Preparation of a Calibration Curve Initial (Cro121 0.0024 M Absorbance 5 mL Volume of 0.0024 M K Cro Total volume 1. I mL 100 mL 2. 100ML 3. 10 mL 100ml 4. 15 mL 100 ML Molar extinction coefficient for [CrO2) [Cro,2) 2.4x100M 12x1044 2.4810M 3.6810M 0.04) 2037.37 0.85 1.13 2. 3. Average molar extinction coefficient...
1. A series of solutions, containing cobalt (I1) chloride were prepared with concentrations shown below. Using PhET Simulation find the absorbance values corresponding to each solution at the preset value of wave length 549 nm, using 1 cm wide cuvette. Concentration of Co (II), mM 121 98.0 60.0 24.0 15.0 Absorbance Plot a calibration line Absorbance versus Concentration. From the graph determine the specific absorptivity. 2. Using the data you obtained from the graph in the previous problem determine the...
3. The absorbance of known concentrations of red food dye were measured in order to generate the following calibration curve. a. Annotate the graph with the labels and units of the x and y axes. Also add an appropriate title. b. Imagine a red food dye solution of unknown concentration was found to have an absorbance of 0.80. Using the calibration curve, estimate the concentration of the unknown dye solution. 2.00E- 3 4 .00E-3 6.00E-3 8.00E-3 1.00E-2 193
Please show calculations for all 4 trials
3cer's law states that the absorbance of a solution is directly proportional to the molar Concentration of a solution. If you plot absorbance versus molar concentration (molarity), the esulting graph yields a straight line. The equation for the straight line can be used to determine he concentration of an unknown solution from a measurement of its absorbance. You need to prepare 10.0 mL of diluted Cuso, solutions with the concentrations listed for Trials...
Determination of Phosphate in Water Out-of-Class Exercise 4. Use Data Set I t o answer the following questions a) Make a plot of absorbance versus concentration for the data set. Draw the best straight line or smooth curve (whichever is appropriate). Put the absorbance on the yaxis and concentration on the cas. b) Make a plot of % transmittance versus concentration for the data set. Draw the best straight line or smooth curve (whichever is appropriate). Put the transmittance on...
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...
Grade: DETERMINATION OF PHOSPHATE IN WATER 1. Option What is the concentration of phosphate in the original lake water sample if the unknown lake water sample in the option had been diluted by taking 25.0 mL of lake water and diluting it to the indicated final volume? 21.comgy 2. Option Water treatment plants must reduce phosphate levels to 3.2 micromoles PO 3-/L before the water is considered drinkable. If water from Lake Pontchartrain is determined to have a phosphate concentration...
Can't figure out the concentration of the complex of
solns. 10, 11, 12, 13, & 14.
Modern Experimental Chemistry Chemistry 153 The Iron(III) Thiocyanate Complex Purpose of the Experiment To determine the chemical formula of a complex ion and measure its formation equilibrium constant Equipment Spectro Vis spectrophotometer and LabQuest, cuvette, 25-mL buret (3), ring stand, buret clamp (2), 50-mL beaker (3), small plastic beakers Reagents SCN, as KSCN, 0.00200 M solution Fe; as Fe(NO), 0.00200 M solution and a...
7. The Absorption Spectrum of Cobalt(II) Chloride Procedure Getting Started 1. Your laboratory instructor may ask that you work in groups rather than alone. 2. Obtain directions from your laboratory instructor for discarding the solutions that you will use in'! this experiment. 3. Obtain instructions for using your spectrophotometer. 4. Obtain your unknown. Making the Measurements 1. Mark each of 7 dry 18 x 150-mm test tubes with one of a series of identification numbers running from 1 to 7....
3. Use the below tables to complete lab calculations on the worksheet on pages 2-6 of this document. You will submit the worksheet via dropbox on Canvas by you assigned lab time the week of March 30th through April 3rd. A document with sample calculations of different concentrations is provided to you on canvas. Enzyme Kinetics Lab Buffer volume (mL) Enzyme Volume (ml) Substrate Volume (ml) TOTAL VOLUME (mL) 0.04 0.5 1.5 0.04 0.25 1.5 0.04 0.1 1.5 0.04 0.05...
help please?
this was the only other information given
REPORT SHEET Determination of the Solubility-Product Constant for a Sparingly Soluble Salt EXPERIMENT 8 A. Preparation of a Calibration Curve Initial (Cro121 0.0024 M Absorbance 5 mL Volume of 0.0024 M K Cro Total volume 1. I mL 100 mL 2. 100ML 3. 10 mL 100ml 4. 15 mL 100 ML Molar extinction coefficient for [CrO2) [Cro,2) 2.4x100M 12x1044 2.4810M 3.6810M 0.04) 2037.37 0.85 1.13 2. 3. Average molar extinction coefficient...
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