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A series of iron standards are analyzed by atomic emission. Agraph of emission vs concentration (ppm)...
25 mL of a serum sample is to be analyzed by atomic emission spectroscopy for silver (Ag) metal. ...
Clearly, the answer is 220ppm. However, I need the steps leading
to it.
25 mL of a serum sample is to be analyzed by atomic emission spectroscopy for silver (Ag) metal. After thorough mixing, a student transferred 2.5 mL of this serum sample to a 100 mL volumetric flask followed by the addition of 10 mL 0.5 M sulfuric acid to the sample. He then diluted it to volume in the volumetric flask with deionized water. After setting up his...
Pyrene was analyzed using GC-MS at the selected ion mode. The calibration curve of peak area (GC-MS response) vs. concentration is shown below along with the regression output. A blank sample was ana...
Pyrene was analyzed using GC-MS at the selected ion mode. The calibration curve of peak area (GC-MS response) vs. concentration is shown below along with the regression output. A blank sample was analyzed seven times, giving a mean peak area of 125 and standard deviation of 15. A check standard at 0.5 ppm was also measured seven times, giving a standard deviation of 300. The raw data, Excel's printouts of linear regression along with the line plot are attached. (a)...
please provide the answer step by step for all the questions. thank you 2. a. was...
please provide the answer step by step for all the
questions. thank you
2. a. was The analysis of the complex formed between Cu(I) and 1,10-phenanthroline conducted using molecular spectroscopic method. The results showed that this complex has a molar absorptivity (8) of 7000 L cm'mol and maximum wavelength absorption (1) of 435 nm. Calculate the absorbance of a 6.77 x 10-6 M solution of the complex when measured in a 1.00 cm cell at wavelength of 435 nm. b....
1A. A sample is analyzed for glucose by UV-Vis absorption spectrometry. A series of glucose standard...
1A. A sample is analyzed for glucose by UV-Vis absorption spectrometry. A series of glucose standard solutions yielded a working curve with a slope of 0.413 A/ppm and an intercept of 0.017 A. The unknown was measured as 0.132 A. What is the concentration of glucose in the sample? a) 0.278 ppm b) 0.320 ppm c) 0.361 ppm d) 0.176 ppm
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...
Plotting concentration in ppm on the x-axis and intensity in mV on the y-axis producesa linear...
Plotting concentration in ppm on the x-axis and intensity in mV on the y-axis producesa linear calibration of y-125x +254. (a) What is the sensitivity? (2 pts) (b) What is the detection limit if the standard deviation of the lowest concentration is 1114 mV? (3 pts) (c) What is the concentration of an unknown that produced a signal of 6998 mV? (3 pts) Calculate the S/N ratio for the following peaks: peak 1 intensity 5400, peak 2 intensity 650, and...
2. An analyst is measuring cadmium in drinking water using Atomic Absorption Spectroscopy. The analyst prepares...
2. An analyst is measuring cadmium in drinking water using Atomic Absorption Spectroscopy. The analyst prepares a set of calibration standards between 1 ppb and 50 ppb. The calibration curve is linear between these concentrations and the linear least squares equation is y=0.0127x + 0.0710. The analyst then runs a set of 4 drinking water samples. a) [What kind of standardization was used for this calibration curve: standard addition, internal standard, or external standard?] b) For sample 1, the analyst...
Imported ceramic bowls are analyzed for toxic heavy metals such as cadmium since these metals can...
Imported ceramic bowls are analyzed for toxic heavy metals such as cadmium since these metals can be leached from the ceramic by the food in contact with it. The amount of cadmium that can be leached from the bowl is determined by adding an acetic acid solution to the bowl for a 24 hour period, after which the cadmium concentration in the acidic leaching solution is determined. In one experiment, the cadmium concentration in an acidic leaching solution was analyzed...
3. Suppose that an unknown sample is analyzed spectrophotometrically at the same wavelength that was used...
3. Suppose that an unknown sample is analyzed
spectrophotometrically at the same wavelength that was used for the
standard curve and the absorbance was found to be 0.196. Use the
standard curve to find the concentration of the unknown.
1. Calculate the concentration of a solution prepared by adding 15.00 mL of 1.98 x 10-3 M KMnO, from a buret into a 50.00 mL volumetric flask, which is then filled to the 50.00 mL graduation mark with distilled water. Hint:...
7. Flame Photometer The data shown below are flame photometer reading on a series of sodium...
7. Flame Photometer The data shown below are flame photometer reading on a series of sodium standards, ppm Rdg(std) Rdg 2 Rdg13 New Na ppm 115 160 200 25 a. Obtain a flame photometry calibration curve by plotting Rdg vs ppm (choose scatter graph). Fit the graph to a straight line and display equation and R-squared value on chart. b. Calculate Rdg 12 and Rdg13 c. Use the following equation to calculate the new ppm New ppm -0.00812 +0.07725*Rdg+ 4.096*20^-5*Rdg^2...
Clearly, the answer is 220ppm. However, I need the steps leading
to it.
25 mL of a serum sample is to be analyzed by atomic emission spectroscopy for silver (Ag) metal. After thorough mixing, a student transferred 2.5 mL of this serum sample to a 100 mL volumetric flask followed by the addition of 10 mL 0.5 M sulfuric acid to the sample. He then diluted it to volume in the volumetric flask with deionized water. After setting up his...
Pyrene was analyzed using GC-MS at the selected ion mode. The calibration curve of peak area (GC-MS response) vs. concentration is shown below along with the regression output. A blank sample was analyzed seven times, giving a mean peak area of 125 and standard deviation of 15. A check standard at 0.5 ppm was also measured seven times, giving a standard deviation of 300. The raw data, Excel's printouts of linear regression along with the line plot are attached. (a)...
please provide the answer step by step for all the
questions. thank you
2. a. was The analysis of the complex formed between Cu(I) and 1,10-phenanthroline conducted using molecular spectroscopic method. The results showed that this complex has a molar absorptivity (8) of 7000 L cm'mol and maximum wavelength absorption (1) of 435 nm. Calculate the absorbance of a 6.77 x 10-6 M solution of the complex when measured in a 1.00 cm cell at wavelength of 435 nm. b....
1A. A sample is analyzed for glucose by UV-Vis absorption spectrometry. A series of glucose standard solutions yielded a working curve with a slope of 0.413 A/ppm and an intercept of 0.017 A. The unknown was measured as 0.132 A. What is the concentration of glucose in the sample? a) 0.278 ppm b) 0.320 ppm c) 0.361 ppm d) 0.176 ppm
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...
Plotting concentration in ppm on the x-axis and intensity in mV on the y-axis producesa linear calibration of y-125x +254. (a) What is the sensitivity? (2 pts) (b) What is the detection limit if the standard deviation of the lowest concentration is 1114 mV? (3 pts) (c) What is the concentration of an unknown that produced a signal of 6998 mV? (3 pts) Calculate the S/N ratio for the following peaks: peak 1 intensity 5400, peak 2 intensity 650, and...
2. An analyst is measuring cadmium in drinking water using Atomic Absorption Spectroscopy. The analyst prepares a set of calibration standards between 1 ppb and 50 ppb. The calibration curve is linear between these concentrations and the linear least squares equation is y=0.0127x + 0.0710. The analyst then runs a set of 4 drinking water samples. a) [What kind of standardization was used for this calibration curve: standard addition, internal standard, or external standard?] b) For sample 1, the analyst...
Imported ceramic bowls are analyzed for toxic heavy metals such as cadmium since these metals can be leached from the ceramic by the food in contact with it. The amount of cadmium that can be leached from the bowl is determined by adding an acetic acid solution to the bowl for a 24 hour period, after which the cadmium concentration in the acidic leaching solution is determined. In one experiment, the cadmium concentration in an acidic leaching solution was analyzed...
3. Suppose that an unknown sample is analyzed
spectrophotometrically at the same wavelength that was used for the
standard curve and the absorbance was found to be 0.196. Use the
standard curve to find the concentration of the unknown.
1. Calculate the concentration of a solution prepared by adding 15.00 mL of 1.98 x 10-3 M KMnO, from a buret into a 50.00 mL volumetric flask, which is then filled to the 50.00 mL graduation mark with distilled water. Hint:...
7. Flame Photometer The data shown below are flame photometer reading on a series of sodium standards, ppm Rdg(std) Rdg 2 Rdg13 New Na ppm 115 160 200 25 a. Obtain a flame photometry calibration curve by plotting Rdg vs ppm (choose scatter graph). Fit the graph to a straight line and display equation and R-squared value on chart. b. Calculate Rdg 12 and Rdg13 c. Use the following equation to calculate the new ppm New ppm -0.00812 +0.07725*Rdg+ 4.096*20^-5*Rdg^2...
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