A standard solution with a concentration of 12.5 ppm gave a fluorescence emission intensity of 5.227...
A standard solution with a concentration of 12.5 ppm gave a fluorescence emission intensity of 5.227 x 104 counts at 457 nm. An unknown sample was diltued by placing 5 mL of the sample into a 250 mL volumetric flask and diluted to the mark. The resulting solution gave an emission intensity of 3.921 x 104 counts at 457 nm. Determine the concentration of analyte in the unknown sample in ppm.
Homework Answers
Add Answer to:
A standard solution with a concentration of 12.5 ppm gave a
fluorescence emission intensity of 5.227...
Question 4 of 4 > Atomic emission spectroscopy and the method of standard addition are used...
Question 4 of 4 > Atomic emission spectroscopy and the method of standard addition are used to determine the Nat concentration and its uncertainty in an unknown sample. Increasing amounts of a 1.75 pg/mL standard Na' solution are added to a series of volumetric flasks containing 15.00 mL of the unknown solution. The volumetric flasks are then diluted to a final volume of 200.0 mL. Atomic emission spectroscopy is then used to measure the emission intensity of each solution Final...
Answer 2) To measure the concentration of phosphorous in a water sample, Phosphorous was first converted...
Answer
2) To measure the concentration of phosphorous in a water sample, Phosphorous was first converted into a color complex in the presence of ammonium molybdate and SnClo. The absorbance of a series of standard phosphorous solutions was measured by a spectrophotometer and gave the calibration curve y 1.150 x, where y is the absorbance of phosphorous complex at 690 nm while x is the concentration of P in ppm. An unknown natural water sample was collected. 10.00 mL of...
Atomic emission spectroscopy and the method of standard addition are used to determine the Nat co...
Atomic emission spectroscopy and the method of standard addition are used to determine the Nat concentration and its uncertainty in an unknown sample. Increasing amounts of a 1.75 μg/m standard Na+ solution are added to a series of volumetric flasks containing 15.00 mL of the unknown 200.0 mL. Atomic emission spectroscopy is then used to measure the emission intensity of each solution. solution. The volumetric flasks are then diluted to a final volume of Unknown volume Standard volume Final volume...
2. The absorbance of a series of standard solutions of a substance X vs concentration [X], in ppm) is measured. The dat...
2. The absorbance of a series of standard solutions of a substance X vs concentration [X], in ppm) is measured. The data is as following: Concentration (ppm) 10.0 20.0 30.0 40.0 50.0 Absorbance 0.105 0.198 0.330 0.402 0.533 An unknown solid sample (0.1050 g) containing substance X was dissolved in 5.0 mL acidic solution and then transferred to a 100.0 mL volumetric flask and filled with deionized water to the mark. The absorbance of this solution is 0.378. What is...
3) Benzo(a)pyrene is a very toxic compound routinely monitored in the environment to prevent humans from...
3) Benzo(a)pyrene is a very toxic compound routinely monitored in the environment to prevent humans from contamination. A water plant uses an ultraviolet-visible spectrometer to monitor benzo(a)pyrene in water samples. A calibration curve was built with a series of benzo(a)pyrene standards. The following data was obtained: Benzo(a)pyrene Concentration (parts-per-million, ppm) 0.00 0.50 1.00 1.50 2.00 2.50 Fluorescence Intensity (counts) 2.21 x 104 4.50 x 10 8.69 x 10 1.31 x 10 1.85 x 10 1.96 x 10 2.02 x 10...
A standard sample was prepared containing 20.00 ppm of an analyte and 10.00 ppm internal standard....
A standard sample was prepared containing 20.00 ppm of an analyte and 10.00 ppm internal standard. The signal readings for these were 0.115 units and 0.321 units respectively. Sufficient internal standard was added to an unknown sample solution to make it contain 15.00 ppm internal standard. This solution gave readings for the analyte and internal standard of 0.266 and 0.275 units respectively. Determine the concentration of the analyte in the unknown sample.
A standard iron solution was prepared by dissolving 0.0100 g of pure iron in acid then...
A standard iron solution was prepared by dissolving 0.0100 g of pure iron in acid then transferring to a 50.00 mL volumetric flask with orthophenanthroline as a complexing agent. At a wavelength of 540 nm, the absorbance of the standard was 0.239 in a 1.00 cm cuvette. A 0.149 g sample of an iron ore was crushed and digested in 5 mL of concentrated acid. The digested sample was then transferred to a 10.00 mL volumetric flask and diluted to...
5-29. A solution containing 3.47 mM X (analyte) and 1.72 mM S (standard) gave peak areas...
5-29. A solution containing 3.47 mM X (analyte) and 1.72 mM S (standard) gave peak areas of 3 473 and 10 222, respectively, in a chromatographic analysis. Then 1.00 mL of 8.47 mM S was added to 5.00 mL of unknown X, and the mixture was diluted to 10.0 mL This solution gave peak areas of 5 428 and 4 431 for X and S respectively (a) Calculate the response factor for the analyte (b) Find the concentration of S...
A 10.00-g sample that contains an analyte is transferred to a 250-mL volumetric flask and diluted...
A 10.00-g sample that contains an analyte is transferred to a 250-mL volumetric flask and diluted to volume. When a 10.00 mL aliquot of the resulting solution is diluted to 25 ml it gives a signal of 0.235 (arbitrary units). A second 10.00 mL portion of the solution is spiked with 10.00 mL of a 1.00-ppm standard solution of the analyze and diluted to 25.00 mL. The signal for the spiked sample is 0.502. Calculate the weight percent of analyte...
need help on these Suppose you obtained the following data from two standard solutions of known...
need help on these
Suppose you obtained the following data from two standard solutions of known concentrations using a UV-Vis spectroscope: Analysis # Conc. (mg/L) 8.00 20.00 Absorbance (at 255 nm) 0.160 0.390 What is the concentration (in mg/L) of an unknown solution with an absorbance of 0.200 at 255 nm 10 points)? The unknown solution contains the same analyte as the standard solution does (Assume a path length of 1cm). 10. You prepared a stock solution by dissolving a...
Question 4 of 4 > Atomic emission spectroscopy and the method of standard addition are used to determine the Nat concentration and its uncertainty in an unknown sample. Increasing amounts of a 1.75 pg/mL standard Na' solution are added to a series of volumetric flasks containing 15.00 mL of the unknown solution. The volumetric flasks are then diluted to a final volume of 200.0 mL. Atomic emission spectroscopy is then used to measure the emission intensity of each solution Final...
Answer
2) To measure the concentration of phosphorous in a water sample, Phosphorous was first converted into a color complex in the presence of ammonium molybdate and SnClo. The absorbance of a series of standard phosphorous solutions was measured by a spectrophotometer and gave the calibration curve y 1.150 x, where y is the absorbance of phosphorous complex at 690 nm while x is the concentration of P in ppm. An unknown natural water sample was collected. 10.00 mL of...
Atomic emission spectroscopy and the method of standard addition are used to determine the Nat concentration and its uncertainty in an unknown sample. Increasing amounts of a 1.75 μg/m standard Na+ solution are added to a series of volumetric flasks containing 15.00 mL of the unknown 200.0 mL. Atomic emission spectroscopy is then used to measure the emission intensity of each solution. solution. The volumetric flasks are then diluted to a final volume of Unknown volume Standard volume Final volume...
2. The absorbance of a series of standard solutions of a substance X vs concentration [X], in ppm) is measured. The data is as following: Concentration (ppm) 10.0 20.0 30.0 40.0 50.0 Absorbance 0.105 0.198 0.330 0.402 0.533 An unknown solid sample (0.1050 g) containing substance X was dissolved in 5.0 mL acidic solution and then transferred to a 100.0 mL volumetric flask and filled with deionized water to the mark. The absorbance of this solution is 0.378. What is...
3) Benzo(a)pyrene is a very toxic compound routinely monitored in the environment to prevent humans from contamination. A water plant uses an ultraviolet-visible spectrometer to monitor benzo(a)pyrene in water samples. A calibration curve was built with a series of benzo(a)pyrene standards. The following data was obtained: Benzo(a)pyrene Concentration (parts-per-million, ppm) 0.00 0.50 1.00 1.50 2.00 2.50 Fluorescence Intensity (counts) 2.21 x 104 4.50 x 10 8.69 x 10 1.31 x 10 1.85 x 10 1.96 x 10 2.02 x 10...
A standard iron solution was prepared by dissolving 0.0100 g of pure iron in acid then transferring to a 50.00 mL volumetric flask with orthophenanthroline as a complexing agent. At a wavelength of 540 nm, the absorbance of the standard was 0.239 in a 1.00 cm cuvette. A 0.149 g sample of an iron ore was crushed and digested in 5 mL of concentrated acid. The digested sample was then transferred to a 10.00 mL volumetric flask and diluted to...
5-29. A solution containing 3.47 mM X (analyte) and 1.72 mM S (standard) gave peak areas of 3 473 and 10 222, respectively, in a chromatographic analysis. Then 1.00 mL of 8.47 mM S was added to 5.00 mL of unknown X, and the mixture was diluted to 10.0 mL This solution gave peak areas of 5 428 and 4 431 for X and S respectively (a) Calculate the response factor for the analyte (b) Find the concentration of S...
need help on these
Suppose you obtained the following data from two standard solutions of known concentrations using a UV-Vis spectroscope: Analysis # Conc. (mg/L) 8.00 20.00 Absorbance (at 255 nm) 0.160 0.390 What is the concentration (in mg/L) of an unknown solution with an absorbance of 0.200 at 255 nm 10 points)? The unknown solution contains the same analyte as the standard solution does (Assume a path length of 1cm). 10. You prepared a stock solution by dissolving a...
Most questions answered within 3 hours.
-
Write a method called removeDuplicates that
accepts a PriorityQueue of integers as a parameter
and modifies...
asked 14 seconds ago -
What is the wavelength, in cm, of a microwave having a frequency
of 3.44 x 10^9...
asked 17 minutes ago -
A new business venture must develop a comprehensive business
plan to borrow money to get started....
asked 19 minutes ago -
Madtack Company uses a job-order costing system and started the month
of March with only one...
asked 21 minutes ago -
Describe how to distinguish true motility from brownian motion
and fluid flow when viewing a wet...
asked 25 minutes ago -
A manufacturer of game controllers is concerned that its
controller may be difficult for left-handed users....
asked 27 minutes ago -
Water at gauge pressure of 3.8 atmospheres at street level
enters an office building at 0.60...
asked 41 minutes ago -
Quick question, I want to know how to convert decimal numbers to
binary number, when i...
asked 1 hour ago -
You found out that now you are going to receive payments of
$8,500 for the next...
asked 1 hour ago -
17.
Technician A says that leaking components are usually repaired
rather than replaced. Technician B says...
asked 1 hour ago -
A) An Operon is:?
1- A gene that affect another gene
transcription.
2. A gene coding...
asked 1 hour ago -
When opening a file, use this method to determine whether a file
exists before you attempt...
asked 1 hour ago