Calculate the concentration of the unknown MnO4- sample, given the following standard addition ex...
Calculate the concentration of the unknown MnO4- sample, given the following standard addition experiment. Step 1: A 2.00 mL aliquot of an unknown MnO4- sample was diluted to 250.0 mL and the absorbance measured to be 0.360. Step 2: A 2.00 mL aliquot of an unknown MnO4- sample was placed in a 250.0 mL flask. A 2.00 mL aliquot of a 100.00 ppm MnO4- standard was added to the flask and the absorbance measured to be 0.770.
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Calculate the concentration of the unknown MnO4- sample, given the following standard addition ex...
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...
Chloride in a water sample can be determined indirectly by atomic absorption spectrometry by precipitating chloride...
Chloride in a water sample can be determined indirectly by
atomic absorption spectrometry by precipitating chloride as AgCl(s)
with a measured amount of AgNO3 that is excess of the chloride
content of the sample. The AgNO3 is added and the sample is
centrifuged. The remaining Ag+ in the solution (supernatant) is
quantified and the chloride is measured by assuming that chloride
was quantitatively precipitated.
Chloride in a water sample can be determined indirectly by atomic absorption spectrometry by precipitating chloride...
20.00 mL unknown sample is diluted to 250.0 mL. Absorbance is 0.2430 Absorbance for 70.00 ppm...
20.00 mL unknown sample is diluted to 250.0 mL. Absorbance is 0.2430 Absorbance for 70.00 ppm std is .950 What is ppm concentration in the original undiluted sample?
A 11.17 mg ore sample containing copper is digested with acid, filtered and transferred to a...
A 11.17 mg ore sample containing copper is digested with acid, filtered and transferred to a volumetric flask and diluted to exactly 200.00 mL. A 10.00 mL aliquot is transferred to a 100.00 mL volumetric flask containing zincon reagent and a quantity of a pH 9 buffer solution. It is then diluted to the mark and mixed thoroughly. The measured absorbance of the resulting blue solution at 600 nm was 0.326 which corresponded to a Cu(II) concentration of 0.498 ppm...
Question 4 (2 points) A working standard 1 is prepared by taking 24.00 mL of a...
Question 4 (2 points) A working standard 1 is prepared by taking 24.00 mL of a 500.0 ppm stock solution and diluting it to a final volume of 360.0 mL. Working standard 2 is prepared by taking 3.00 mL of working standard 1 and diluting it to a final volume of 250.0 mL. Calculate the ppm concentration of the working standard 2. Provide your answer to three places after the decimal and without units. Your Answer: Answer Question 5 (2...
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...
4) An unknown concentration of NiSO4 solution is to be determined by colorimetric analysis using a...
4) An unknown concentration of NiSO4 solution is to be determined by colorimetric analysis using a spectrophotometer. The standard solutions are prepared as the following: 2.00 mL (the same procedures for 3.0 mL, 4.00 mL, 6.00 mL, 7.00 mL) of the stock solution of 1.00 M NİSO4 is transferred into a 25-mL volumen flask and diluted by adding distilled water to the mark line. The spectrophotometer is calibrated at the wavelength of 635 nm. The absorbance (A) readings and the...
You prepared standard benzoic acid and caffeine solutions that allowed you to produce four standard curves...
You prepared standard benzoic acid and caffeine solutions that allowed you to produce four standard curves with the linear equations listed below. You also diluted an unknown solution by taking a 4 mL aliquot with a volumetric pipet and transferring it into a 100 mL volumetric flask that contained 10 mL of 0.10 M HCl. You then diluted it to the mark with Dl water. You measured the absorbance at both wavelengths for the diluted unknown. The data is shown...
A 2.00-mL urine sample was treated with molybdenum blue reagent to produce a species absorbing at...
A 2.00-mL urine sample was treated with molybdenum blue reagent to produce a species absorbing at 820nm, after which the sample was diluted to 100mL. A 25.00mL aliquot of this solution gave an absorbance of 0.428. Addition of 1.00 mL of a standard solution containing 0.0500 mg/mL of phosphate to a second 25.00-mL aliquot gave an absorbance of 0.517. Use these data to calculate the concentration of phosphate in milligrams per milliliter of the original urine sample.
To analyze the chromium in an unknown sample 1.5623 f of the sample was pretreated and...
To analyze the chromium in an unknown sample 1.5623 f of the sample was pretreated and diluted to the exact 100 mL mark in a volumetric flask. Two 20.0 mL samples of this solution were taken. In the first sample, a Cr-EDTA complex is developed and sufficient water is added to give a total volume of 100.0 mL. In the second sample, 10.0 mL of Cr(III) standard solution at to concentration of 15 mM was added before developing the Cr-EDTA...
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...
Chloride in a water sample can be determined indirectly by
atomic absorption spectrometry by precipitating chloride as AgCl(s)
with a measured amount of AgNO3 that is excess of the chloride
content of the sample. The AgNO3 is added and the sample is
centrifuged. The remaining Ag+ in the solution (supernatant) is
quantified and the chloride is measured by assuming that chloride
was quantitatively precipitated.
Chloride in a water sample can be determined indirectly by atomic absorption spectrometry by precipitating chloride...
20.00 mL unknown sample is diluted to 250.0 mL. Absorbance is 0.2430 Absorbance for 70.00 ppm std is .950 What is ppm concentration in the original undiluted sample?
Question 4 (2 points) A working standard 1 is prepared by taking 24.00 mL of a 500.0 ppm stock solution and diluting it to a final volume of 360.0 mL. Working standard 2 is prepared by taking 3.00 mL of working standard 1 and diluting it to a final volume of 250.0 mL. Calculate the ppm concentration of the working standard 2. Provide your answer to three places after the decimal and without units. Your Answer: Answer Question 5 (2...
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...
4) An unknown concentration of NiSO4 solution is to be determined by colorimetric analysis using a spectrophotometer. The standard solutions are prepared as the following: 2.00 mL (the same procedures for 3.0 mL, 4.00 mL, 6.00 mL, 7.00 mL) of the stock solution of 1.00 M NİSO4 is transferred into a 25-mL volumen flask and diluted by adding distilled water to the mark line. The spectrophotometer is calibrated at the wavelength of 635 nm. The absorbance (A) readings and the...
You prepared standard benzoic acid and caffeine solutions that allowed you to produce four standard curves with the linear equations listed below. You also diluted an unknown solution by taking a 4 mL aliquot with a volumetric pipet and transferring it into a 100 mL volumetric flask that contained 10 mL of 0.10 M HCl. You then diluted it to the mark with Dl water. You measured the absorbance at both wavelengths for the diluted unknown. The data is shown...
To analyze the chromium in an unknown sample 1.5623 f of the sample was pretreated and diluted to the exact 100 mL mark in a volumetric flask. Two 20.0 mL samples of this solution were taken. In the first sample, a Cr-EDTA complex is developed and sufficient water is added to give a total volume of 100.0 mL. In the second sample, 10.0 mL of Cr(III) standard solution at to concentration of 15 mM was added before developing the Cr-EDTA...
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