1. How much anhydrous CuSO4 in grams are required to prepare 700.0 mL of 0.30 M...
1. How much anhydrous CuSO4 in grams are required to prepare 700.0 mL of 0.30 M CuSO4 solution? Molar mass of CuSO4 = 159.62 g
2. A student determined the molar absorptivity of a copper (II) sulfate solution to be 2.81 M-1 cm-1 . If the absorbance of the given solution was 0.703, what was the concentration of the given solution? Assume the path length of solution 1.0 cm.
3. Why should you rinse the cuvette before you fill it up with the solution to be measured?
4. What is the purpose of determining λmax in this experiment? What might happen if you use wavelength other than λmax?
Homework Answers
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1. How much anhydrous CuSO4 in grams are required to prepare
700.0 mL of 0.30 M...
CuSO4• 5H20 -------> Custy + D u 2) What is the color for anhydrous salt of copper (II) sulfate (CuSO4)? What is...
CuSO4• 5H20 -------> Custy + D u 2) What is the color for anhydrous salt of copper (II) sulfate (CuSO4)? What is the color for ionic hydrate compound of copper (II) sulfate pentahydrate (CuSO4.5H2O)? 3) How would you test a colorless crystalline compound to determine whether it is a hydrate or not? 4) How many grams of CuSO4.5H20 are needed to prepare 50.0 mL of a 1.00 M CuSO4 solution? 5) Suppose you used the Procedure in this experiment to...
1) When CuSO SHO is heated, it decomposes to anhydrous CuSO4 and water. Complete and balance...
1) When CuSO SHO is heated, it decomposes to anhydrous CuSO4 and water. Complete and balance the following reaction, CuSO4+ 5HO 2) What is the color for anhydrous salt of copper (II) sulfate (CuSO.)? What is the color for ionic hydrate compound of copper (II) sulfate pentahydrate (CuSO. SH:O)? 3) How would you test a colorless crystalline compound to determine whether it is a hydrate or not? 4) How many grams of CuSO4 5H20 are needed to prepare 50,0 mL...
Question 8 Status: Tries remaining: 21 Points possible: 1.00 Suppose you measure the absorbance of a...
Question 8 Status: Tries remaining: 21 Points possible: 1.00 Suppose you measure the absorbance of a yellow dye solution in a 1.00 cm cuvette. cm what is The absorbance of the solution at 427 nm is 0.46. If the molar absorptivity of yellow dye at 427 nm is 27400 M the concentration of the solution? Answer: Question 9 Status: Tries remaining: 2 Points possible: 1.00 If you plot the absorbance measurements of solutions vs. their concentrations, what is the slope...
2.35 x 10-4 g of a purple dye was combined with 50.0 mL, for a final...
2.35 x 10-4 g of a purple dye was combined with 50.0 mL, for a final concentration of 27.5 µM. What is the molar mass of the dye? Answer: 171 g/mol a. The same dye solution was found to have an absorbance of 0.381. What color of light would you expect for its λmax? What is the molar absorptivity? Answer: λmax at yellow, 13900 M-1 cm-1
Name: Determination of Solution Concentration by Spectrophotometry PRELAB QUESTIONS 1. A student measures the absorbance of...
Name: Determination of Solution Concentration by Spectrophotometry PRELAB QUESTIONS 1. A student measures the absorbance of an unknown after placing a sample in a cuvette which contained some water. How will this affect the concentration he reports? 2. Explain why it is all right to leave water in the volumetric flask before you put in the 10.00 mL of your unknown. 3. A 1.3 x 10-M solution of an unknown substance has an absorbance of 0.345 at its max. a)...
1. Use the following data to construct a calibration curve and determine the concentration of unknown...
1. Use the following data to construct a calibration curve and determine the concentration of unknown as given. What is the molar absorptivity of the analyte? The compound solutions were measured in a 0.5 cm path length quartz cuvette. solution [X] (M) Absorbance At 254 nm Standard 1 Standard 2 Standard 3 Standard 4 Standard 5 Sample 0.03584 0.05719 0.1289 0.2305 0.3161 ??? 0.097 0.169 0.365 0.682 0.997 0.719
PART 1: If you dilute 20.0 mL of 1.00 M hydrochloric acid to 750. mL, what...
PART 1: If you dilute 20.0 mL of 1.00 M hydrochloric acid to 750. mL, what is the molar concentration of the dilute acid? Molar concentration = ____________ M PART 2: If 7.00 mL of 0.0121 M CuSO4 is diluted to 10.0 mL with pure water, what is the molar concentration of copper(II) sulfate in the diluted solution? Molar concentration = ____________M
Post LaboratorY Qustions A colored salution had a large absorbance peak at 690 nm Use the...
Post LaboratorY Qustions A colored salution had a large absorbance peak at 690 nm Use the visitle spectrum in your text or other reliable source to determine the color of this solution 2 A soft drink had a tertrazine also known as yellow #5 concentration of 1.75 x 10 M If a person drank two 12 ounce cans of this beverage for a vear (365 days). What mass of tartrazine would the person consume? Moleculer weight 534 g/mol for tartrazine....
1. You are provided with 1M solution of CuSO4. 2. Calculate how many grams of CuSO4...
1. You are provided with 1M solution of CuSO4. 2. Calculate how many grams of CuSO4 are dissolved in 100 mL of water to prepare this solution. Show your work in the space provided below. (Molar mass of CuSO4 = 159.6086 g/mol) (1 mark) Scso this . cutissu 159.6 خرداكولات و 3. Using a suitable transfer pipette transfer V. mL of your 1M Cuso. solution into a 100 ml volumetric flask. CV C 2V2 4. Using the equation CiV1=C2V2 calculate...
Hi, I need help with answering these questions. Thank you. 1) What is the molar absorptivity...
Hi, I need help with answering these questions. Thank you.
1) What is the molar absorptivity of riboflavin (with units)?
Assume that the cuvette has a pathlength of 1.00 cm and that the
blank had an absorbance of 0.00.
2. If a sample of riboflavin with an unknown concentration had
an absorbance of 0.597, what is the concentration of the
sample?
3. A sample of riboflavin is prepared by crushing 5 tablets and
dissolving them in enough water to create...
CuSO4• 5H20 -------> Custy + D u 2) What is the color for anhydrous salt of copper (II) sulfate (CuSO4)? What is the color for ionic hydrate compound of copper (II) sulfate pentahydrate (CuSO4.5H2O)? 3) How would you test a colorless crystalline compound to determine whether it is a hydrate or not? 4) How many grams of CuSO4.5H20 are needed to prepare 50.0 mL of a 1.00 M CuSO4 solution? 5) Suppose you used the Procedure in this experiment to...
1) When CuSO SHO is heated, it decomposes to anhydrous CuSO4 and water. Complete and balance the following reaction, CuSO4+ 5HO 2) What is the color for anhydrous salt of copper (II) sulfate (CuSO.)? What is the color for ionic hydrate compound of copper (II) sulfate pentahydrate (CuSO. SH:O)? 3) How would you test a colorless crystalline compound to determine whether it is a hydrate or not? 4) How many grams of CuSO4 5H20 are needed to prepare 50,0 mL...
Question 8 Status: Tries remaining: 21 Points possible: 1.00 Suppose you measure the absorbance of a yellow dye solution in a 1.00 cm cuvette. cm what is The absorbance of the solution at 427 nm is 0.46. If the molar absorptivity of yellow dye at 427 nm is 27400 M the concentration of the solution? Answer: Question 9 Status: Tries remaining: 2 Points possible: 1.00 If you plot the absorbance measurements of solutions vs. their concentrations, what is the slope...
Name: Determination of Solution Concentration by Spectrophotometry PRELAB QUESTIONS 1. A student measures the absorbance of an unknown after placing a sample in a cuvette which contained some water. How will this affect the concentration he reports? 2. Explain why it is all right to leave water in the volumetric flask before you put in the 10.00 mL of your unknown. 3. A 1.3 x 10-M solution of an unknown substance has an absorbance of 0.345 at its max. a)...
1. Use the following data to construct a calibration curve and determine the concentration of unknown as given. What is the molar absorptivity of the analyte? The compound solutions were measured in a 0.5 cm path length quartz cuvette. solution [X] (M) Absorbance At 254 nm Standard 1 Standard 2 Standard 3 Standard 4 Standard 5 Sample 0.03584 0.05719 0.1289 0.2305 0.3161 ??? 0.097 0.169 0.365 0.682 0.997 0.719
Post LaboratorY Qustions A colored salution had a large absorbance peak at 690 nm Use the visitle spectrum in your text or other reliable source to determine the color of this solution 2 A soft drink had a tertrazine also known as yellow #5 concentration of 1.75 x 10 M If a person drank two 12 ounce cans of this beverage for a vear (365 days). What mass of tartrazine would the person consume? Moleculer weight 534 g/mol for tartrazine....
1. You are provided with 1M solution of CuSO4. 2. Calculate how many grams of CuSO4 are dissolved in 100 mL of water to prepare this solution. Show your work in the space provided below. (Molar mass of CuSO4 = 159.6086 g/mol) (1 mark) Scso this . cutissu 159.6 خرداكولات و 3. Using a suitable transfer pipette transfer V. mL of your 1M Cuso. solution into a 100 ml volumetric flask. CV C 2V2 4. Using the equation CiV1=C2V2 calculate...
Hi, I need help with answering these questions. Thank you.
1) What is the molar absorptivity of riboflavin (with units)?
Assume that the cuvette has a pathlength of 1.00 cm and that the
blank had an absorbance of 0.00.
2. If a sample of riboflavin with an unknown concentration had
an absorbance of 0.597, what is the concentration of the
sample?
3. A sample of riboflavin is prepared by crushing 5 tablets and
dissolving them in enough water to create...
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