Homework Answers
plotting calibration curve : absorbance vs added Mn
Calibration curve : A = 0.0252C + 0.1265
in sample A = 0.123 => C = (0.123-0.1265)/0.0252 => C turns out to be negative => value of absorbance has wrongly taken, please take value of absorbance again and put in the equation , you will get amount of Mn in ppm in sample
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1. (10 In the standard addition analysis of fecal Mn, the sample is first ashed and...
A. 0.191 g of steel was dissolved in acid and diluted to 100 mL with water. The solution was found to contain 7.7 ppm Mn by atomic absorption analysis. What was the weight percent Mn in the steel? B....
A. 0.191 g of steel was dissolved in acid and diluted to 100 mL with water. The solution was found to contain 7.7 ppm Mn by atomic absorption analysis. What was the weight percent Mn in the steel? B. A multivitamin tablet with a label value of 13 mg Zn per tablet was dissolved in acid and diluted to 100 mL with water. What is the theoretical Zn concentration of the solution? Answer in 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...
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...
An environmental chemist working for the Environmental Protection Agency (EPA) was directed to collect razor clams...
An environmental chemist working for the Environmental Protection Agency (EPA) was directed to collect razor clams from a heavily-contaminated river superfund site and analyze them for their Cd2+ content using graphite furnace atomic absorption spectrometry (GFAAS). The chemist dried the clams at 95 °C overnight and ground them in a scientific blender, resulting in approximately 50 g of homogenized dry weight. A representative 99.31 mg sample was taken from the approximately 50 g of dry material and dissolved in 100.0...
An environmental chemist working for the Environmental Protection Agency (EPA) was directed to collect razor clams from a heavily
An environmental chemist working for the Environmental Protection Agency (EPA) was directed to collect razor clams from a heavily-contaminated river superfund site and analyze them for their Cd2+ content using graphite furnace atomic absorption spectrometry (GFAAS). The chemist dried the clams at 95 °C overnight and ground them in a scientific blender, resulting in approximately 50 g of homogenized dry weight. A representative 58,51 mg sample was taken from the approximately 50 g of dry material and dissolved in 100.0...
need help with b and c JUHU GREI eacn addition in Data Table 1. Mass of...
need help with b and c
JUHU GREI eacn addition in Data Table 1. Mass of AgzAsO4, 8 Data Table 1. Gravimetric Analysis of AgzAsO4 precipitate Aliquot Total volume 1 M Total volume in AgNO3 added, mL Na3AsO, flask, mL Initial 0.1L/100 ml 0.0 10.5 1.0 1.5 2.0 2.5 3 .0 160. 51 mL 101.02 101.53 102.05 102.56 103.07 103.57 I 104.07 0.0770847 0.154173 0.231261 0.308348 0.385435 0.462463 0.462530 0.462530 4.0 b) Using the final mass of AgaAsO4, calculate the...
111 Experiment 11 AN INSTRUMENTAL ANALYSIS OF POP FOR ITS PHOSPHORIC ACID CONTENT The Pre-Lab ....
111 Experiment 11 AN INSTRUMENTAL ANALYSIS OF POP FOR ITS PHOSPHORIC ACID CONTENT The Pre-Lab . A student performs an experiment for the determination of phosphoric acid (H)PO present in a cola soft drink. A 0.5 milliliters sample of cola is diluted to 125 mL. The measured absorbance is 0.262. Using a graph of absorbance versus H,PO concentration, the student determines that the diluted cola solution has a concentra- tion of 15.5 x 10 moles liter: a) Calculate the total...
question one question two Aspirin lab (10 points) 5. a) Spectroscopy is being used to determine...
question one
question two
Aspirin lab (10 points) 5. a) Spectroscopy is being used to determine the concentration of aspirin in an unknown sample. The absorbance spectrum of the highest concentration standard [Fe3+, SA) prepared is given below. What wavelength should be used to create the calibration curve for the experiment? Explain your reasoning. 0.14 Absorbance 0.02 250 300 450 500 350 400 Wavelength (nm) Wavelength Explain your reason briefly. b) In this experiment an aspirin tablet was placed in...
1 . If a buffer solution is 0.260 M in a weak acid (?a=8.3×10−5)and 0.480 M in its conjugate base, what is the pH? pH= 2...
1 . If a buffer solution is 0.260 M in a weak acid (?a=8.3×10−5)and 0.480 M in its conjugate base, what is the pH? pH= 2. If a buffer solution is 0.200 M in a weak base (?b=5.0×10−5) and 0.530 M in its conjugate acid, what is the ph 3. Phosphoric acid is a triprotic acid (?a1=6.9×10−3, ?a2=6.2×10−8 , and ?a3=4.8×10−13 To find the pH of a buffer composed of H2PO4 - (aq) ) and HPO4 2− (aq) , which...
Heres are the steps that were followed... Please help. Let me know if their is any...
Heres are the steps that were followed...
Please help. Let me know if their is any missing
information.
ii) Nickel analysis - Prepare three standard nickel solutions using the following procedure. Accurately weigh approximately 1.0 g of [Ni(H20)6]504 into a 50 mL volumetric flask. Add 10 mL of D.I. water followed by 10 mL of 1 M H2SO4(aq) to dissolve the salt and then dilute to the mark with deionized water. Pipet 10 mL of the solution into one 25...
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...
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...
need help with b and c
JUHU GREI eacn addition in Data Table 1. Mass of AgzAsO4, 8 Data Table 1. Gravimetric Analysis of AgzAsO4 precipitate Aliquot Total volume 1 M Total volume in AgNO3 added, mL Na3AsO, flask, mL Initial 0.1L/100 ml 0.0 10.5 1.0 1.5 2.0 2.5 3 .0 160. 51 mL 101.02 101.53 102.05 102.56 103.07 103.57 I 104.07 0.0770847 0.154173 0.231261 0.308348 0.385435 0.462463 0.462530 0.462530 4.0 b) Using the final mass of AgaAsO4, calculate the...
111 Experiment 11 AN INSTRUMENTAL ANALYSIS OF POP FOR ITS PHOSPHORIC ACID CONTENT The Pre-Lab . A student performs an experiment for the determination of phosphoric acid (H)PO present in a cola soft drink. A 0.5 milliliters sample of cola is diluted to 125 mL. The measured absorbance is 0.262. Using a graph of absorbance versus H,PO concentration, the student determines that the diluted cola solution has a concentra- tion of 15.5 x 10 moles liter: a) Calculate the total...
question one
question two
Aspirin lab (10 points) 5. a) Spectroscopy is being used to determine the concentration of aspirin in an unknown sample. The absorbance spectrum of the highest concentration standard [Fe3+, SA) prepared is given below. What wavelength should be used to create the calibration curve for the experiment? Explain your reasoning. 0.14 Absorbance 0.02 250 300 450 500 350 400 Wavelength (nm) Wavelength Explain your reason briefly. b) In this experiment an aspirin tablet was placed in...
Heres are the steps that were followed...
Please help. Let me know if their is any missing
information.
ii) Nickel analysis - Prepare three standard nickel solutions using the following procedure. Accurately weigh approximately 1.0 g of [Ni(H20)6]504 into a 50 mL volumetric flask. Add 10 mL of D.I. water followed by 10 mL of 1 M H2SO4(aq) to dissolve the salt and then dilute to the mark with deionized water. Pipet 10 mL of the solution into one 25...
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