Recent questions in Chemistry

0 votes

1 answer 149 views

What is the concentration of iron(II) sulfate in a 20 mL sample solution that has an absorbance of 0.45 at 562 nm, given that the molar extinction coefficient of iron(II) sulfate at that wavelength is 7,590 M^-1cm^-1?

asked Jan 30 in Analytical Chemistry by AudreaV25265 (2.0k points)

0 votes

1 answer 173 views

What is the concentration of iron(II) ions in a water sample that has an absorbance of 0.55 at 510 nm when treated with a standard solution of 4.65 x 10^-5 M iron(II) sulfate using colorimetry?

asked Jan 30 in Analytical Chemistry by LawrenceMcGr (1.8k points)

0 votes

1 answer 122 views

What is the concentration of iron(II) ions in a sample of water collected from a local pond using colorimetry, if the measured absorbance of the sample at 565 nm is 0.673 and the molar absorptivity of the iron(II) complex at this wavelength is 20,500 M⁻¹·cm⁻¹?

asked Jan 30 in Analytical Chemistry by MOIRoderick9 (1.8k points)

0 votes

1 answer 113 views

What is the concentration of iron ions in a water sample collected from a local lake using polarography technique?

asked Jan 30 in Analytical Chemistry by ChristelIdr7 (1.7k points)

0 votes

1 answer 158 views

What is the concentration of iron ions in a sample of tap water using spectrophotometry?

asked Jan 30 in Analytical Chemistry by GlendaNester (1.8k points)

0 votes

1 answer 128 views

What is the concentration of iron in a water sample collected from a local lake using voltammetry with a standard potential of -0.44 V?

asked Jan 30 in Analytical Chemistry by RandolphWvo (1.9k points)

0 votes

1 answer 126 views

What is the concentration of iron (II) sulfate in a given solution using spectrophotometry with a known absorbance value at a wavelength of 400 nm?

asked Jan 30 in Analytical Chemistry by EleanoreOliv (1.9k points)

0 votes

1 answer 178 views

What is the concentration of iron (II) ions in a water sample, measured in mg/L, if the sample has an absorbance reading of 0.345 at a wavelength of 477 nm using a colorimeter and following the methodology of the 1,10-phenanthroline method?

asked Jan 30 in Analytical Chemistry by Calvin40083 (1.6k points)

0 votes

1 answer 175 views

What is the concentration of iron (II) ions in a water sample with absorbance of 0.295 at a wavelength of 510 nm, given that the molar extinction coefficient of iron (II) ions is 11,300 M^-1cm^-1 at this wavelength? Use colorimetry to determine the solution.

asked Jan 30 in Analytical Chemistry by Diana66S829 (1.6k points)

0 votes

1 answer 179 views

What is the concentration of iron (II) ions in a water sample if the absorbance of the sample at a wavelength of 565 nm is measured to be 0.842 and it was found that a 1 cm cuvette contains 1.25 x 10^-4 moles of iron (II) ions? (The molar absorptivity of iron (II) ions at 565 nm is 1.9 x 10^4 L/mol cm).

asked Jan 30 in Analytical Chemistry by MarcyWoolery (1.8k points)

0 votes

1 answer 141 views

What is the concentration of iron (II) ions in a solution if the absorbance reading from the colorimeter is 0.43 and the path length of the solution in the cuvette is 1 cm? The molar absorption coefficient of iron (II) ions is 6.16 x 10^3 M^-1 cm^-1. The solution has a volume of 10 mL. Calculate the concentration of iron (II) ions in the solution in units of Molarity.

asked Jan 30 in Analytical Chemistry by Jaqueline50I (2.0k points)

0 votes

1 answer 164 views

What is the concentration of iron (II) ions in a sample of tap water? Use colorimetry to determine the absorbance of the sample and compare it to a standard calibration curve for iron (II) ions.

asked Jan 30 in Analytical Chemistry by TBHMelaine51 (2.2k points)

0 votes

1 answer 147 views

What is the concentration of iron (II) ions in a given solution using spectrophotometry if the absorbance value obtained from a calibration curve is 0.58 and the molar absorptivity of iron (II) ions at the given wavelength is 9.6 x 10^3 L mol^-1 cm^-1?

asked Jan 30 in Analytical Chemistry by LuzGerste41 (1.9k points)

0 votes

1 answer 128 views

What is the concentration of iron (II) ion in a sample of drinking water using colorimetry, if the absorbance of the sample is found to be 0.294 and the molar absorption coefficient of iron (II) complex is 10,500 M^-1 cm^-1 at the wavelength of 505 nm?

asked Jan 30 in Analytical Chemistry by KristopherMi (2.1k points)

0 votes

1 answer 138 views

What is the concentration of iron (II) in a water sample collected from a local river using colorimetry?

asked Jan 30 in Analytical Chemistry by BrianneWoodw (2.2k points)

0 votes

1 answer 135 views

What is the concentration of iron (II) in a sample of water collected from a local stream, given that the absorbance of the sample is 0.35 at a wavelength of 565 nm? The iron (II) ions form a complex with 1,10-phenanthroline, which has a molar extinction coefficient of 7.58 x 10^3 L mol^-1 cm^-1 at the same wavelength.

asked Jan 30 in Analytical Chemistry by KariMcCleary (1.5k points)

0 votes

1 answer 164 views

What is the concentration of iron (Fe) present in a given water sample using colorimetry as the analytical method, given that the absorbance at a wavelength of 565 nm is 0.423 and the molar absorptivity of the Fe-phenanthroline complex is 11,100 M^-1 cm^-1?

asked Jan 30 in Analytical Chemistry by CecileODrisc (1.9k points)

0 votes

1 answer 136 views

What is the concentration of iron (Fe) ions in a water sample collected from a river using spectrophotometry with an absorbance reading of 0.75 and known molar absorptivity of 3.6 x 10^3 L mol^-1 cm^-1? The sample has a path length of 1 cm and a volume of 25 mL.

asked Jan 30 in Analytical Chemistry by LavernEcm901 (1.8k points)

0 votes

1 answer 171 views

What is the concentration of iron (Fe) in a water sample using cyclic voltammetry?

asked Jan 30 in Analytical Chemistry by ForrestWalde (1.8k points)

0 votes

1 answer 140 views

What is the concentration of iron (Fe) in a sample of water collected from a nearby river using spectrophotometric analysis?

asked Jan 30 in Analytical Chemistry by LesleyTharp (1.9k points)

Categories