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Question 2 2 pts The concentration of Cd2+ in a local water sample was determined...
Co(II) was used as an internal standard to analyze a sample of Ti(IV) with atomic absorption...
Co(II) was used as an internal standard to analyze a sample of Ti(IV) with atomic absorption spectroscopy (AAS). A standard mixture containing 1.32 j/g Co/mL and 1.54 [jg Ti/mL measured by AAS produced a signal-to-signal ratio of 1.78 Ti: 1.00 Co. A mixture was prepared by combining 5.00 mL of a Ti(IV) solution of unknown concentration with 3.50 mL of a 11.7 jug/mL solution of Co(ll). The absorbance of the mixture at the Ti(IV) wavelength was 0.149 and the absorbance...
Co(ll) was used as an internal standard to analyze a sample of Ti(IV) with atomic absorption spectroscopy (AAS). A standard mixture containing 1.90 g Co/mL and 1.53 /g Ti/mL measured by AAS produced...
Co(ll) was used as an internal standard to analyze a sample of Ti(IV) with atomic absorption spectroscopy (AAS). A standard mixture containing 1.90 g Co/mL and 1.53 /g Ti/mL measured by AAS produced a signal-to-signal ratio of 2.04 Ti: 1.00 Co A mixture was prepared by combining 4.50 mL of a Ti(IV) solution of unknown concentration with 3.50 mL of a 14.4 ug/mL solution of Co(l1). The absorbance of the mixture at the Ti(IV) wavelength was 0.100 and the absorbance...
(10 pts) The iron content of a well water sample is determined by UV-Vis spectroscopy. A...
(10 pts) The iron content of a well water sample is determined by UV-Vis spectroscopy. A 10.00 mL aliquot of well water is transferred to a 100.0-mL volumetric flask and 20 mL of 0.10 M nitric acid is added to oxidize iron (II) to iron (II). Next 30 mL of a 0.1 M sodium thiocyanate solution is added to form the deep red complex iron (II) thiocyanate. The solution is diluted to volume with DI water. A reagent blank is...
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...
Copper was determined in a river water sample by atomic absorption spectrometry and the method of...
Copper was determined in a river water sample by atomic absorption spectrometry and the method of standard additions. For the addition, 250.0 μL of a 1000.0-μg/mL standard was added to 150.0 mL of solution. The following data were obtained Absorbance of reagent blank = 0.023 Absorbance of sample = 0.519 Absorbance of sample plus addition - blank = 1.017 Calculate the copper concentration in the sample. Later studies showed that the reagent blank used to obtain the above data was...
To determine the Ca^2+ concentration in water sample, a standard EDTA solution of 0.01988 M was...
To determine the Ca^2+ concentration in water sample, a standard EDTA solution of 0.01988 M was used to titrate 25 ml. of the sample solution with the presence of an ammonium buffer (pH 10). If 15.80 ml. of the standard EDTA was used to reach the end point, calculate the molar concentration and the ppm concentration of the unknown Ca^2+ (atomic weight of Ca = 40.08g/mole) solution The amount of 0.2915g of benzoic acid was dissolved in 100 ml. of...
The cation content of a water sample is determined by exchanging the cations for protons on stron...
The cation content of a water sample is determined by exchanging the cations for protons on strong acid and ion-exchange resin. An 25 mL sample was added to a 2 g resin. After reaching equilibrium the resin is filtered off and the solution titrated with alkali. 18 mL of 0.020 M NaOH are required to reach the endpoint. Calculate the normal concentration of cations ( the number of equivalents present in 1 L of sample).Your answer must be in order...
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...
7. The lead level in a sample of contaminated soil was determined using atomic absorption spectrometry....
7. The lead level in a sample of contaminated soil was determined using atomic absorption spectrometry. A 2.0 g sample was dissolved in acid and then diluted to a total volume of 50.0 mL. The absorbance of this solution, determined in a spectrometer set at a wavelength of 218 nm, was found to be 0.20. Several standard solutions of lead were tested under the same conditions and the calibration curve shown below was generated. The concentration of lead in the...
The concentration of sulfate in a sample of wastewater is to be determined by using gravimetric...
The concentration of sulfate in a sample of wastewater is to be determined by using gravimetric analysis. To a 100.0-mL sample of the wastewater is added an excess of calcium nitrate, forming the insoluble calcium sulfate (136.1 g/mol) according to the balanced equation given below. The solid calcium sulfate is dried, and its mass is measured to be 0.7272 g. What was the concentration of sulfate ion in the original wastewater sample? SO4 2– (aq) + Ca(NO3)2(aq) –––––> CaSO4(s) +...
Co(II) was used as an internal standard to analyze a sample of Ti(IV) with atomic absorption spectroscopy (AAS). A standard mixture containing 1.32 j/g Co/mL and 1.54 [jg Ti/mL measured by AAS produced a signal-to-signal ratio of 1.78 Ti: 1.00 Co. A mixture was prepared by combining 5.00 mL of a Ti(IV) solution of unknown concentration with 3.50 mL of a 11.7 jug/mL solution of Co(ll). The absorbance of the mixture at the Ti(IV) wavelength was 0.149 and the absorbance...
Co(ll) was used as an internal standard to analyze a sample of Ti(IV) with atomic absorption spectroscopy (AAS). A standard mixture containing 1.90 g Co/mL and 1.53 /g Ti/mL measured by AAS produced a signal-to-signal ratio of 2.04 Ti: 1.00 Co A mixture was prepared by combining 4.50 mL of a Ti(IV) solution of unknown concentration with 3.50 mL of a 14.4 ug/mL solution of Co(l1). The absorbance of the mixture at the Ti(IV) wavelength was 0.100 and the absorbance...
(10 pts) The iron content of a well water sample is determined by UV-Vis spectroscopy. A 10.00 mL aliquot of well water is transferred to a 100.0-mL volumetric flask and 20 mL of 0.10 M nitric acid is added to oxidize iron (II) to iron (II). Next 30 mL of a 0.1 M sodium thiocyanate solution is added to form the deep red complex iron (II) thiocyanate. The solution is diluted to volume with DI water. A reagent blank is...
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...
To determine the Ca^2+ concentration in water sample, a standard EDTA solution of 0.01988 M was used to titrate 25 ml. of the sample solution with the presence of an ammonium buffer (pH 10). If 15.80 ml. of the standard EDTA was used to reach the end point, calculate the molar concentration and the ppm concentration of the unknown Ca^2+ (atomic weight of Ca = 40.08g/mole) solution The amount of 0.2915g of benzoic acid was dissolved in 100 ml. of...
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...
7. The lead level in a sample of contaminated soil was determined using atomic absorption spectrometry. A 2.0 g sample was dissolved in acid and then diluted to a total volume of 50.0 mL. The absorbance of this solution, determined in a spectrometer set at a wavelength of 218 nm, was found to be 0.20. Several standard solutions of lead were tested under the same conditions and the calibration curve shown below was generated. The concentration of lead in the...
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