Recent questions in Chemistry

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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 PrinceHavila (270 points)

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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 NannieKling5 (390 points)

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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 MalindaHendr (370 points)

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1 answer 76 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 Leesa812985 (470 points)

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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 Wyatt28H007 (490 points)

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1 answer 74 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 PrincessZ64 (390 points)

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1 answer 68 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 SangKlass44 (410 points)

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1 answer 80 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 PhillisCrews (510 points)

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1 answer 63 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 EvelyneShell (390 points)

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1 answer 80 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 JoesphDescot (290 points)

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1 answer 82 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 MoraBalog644 (430 points)

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1 answer 105 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 LuellaRigby (270 points)

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1 answer 88 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 FaustoOverto (490 points)

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1 answer 79 views

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

asked Jan 30 in Analytical Chemistry by DeboraPrenti (250 points)

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1 answer 85 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 EnriqueCaudi (310 points)

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1 answer 66 views

What is the concentration of iron (Fe) in a sample of river water using spectrophotometry at a wavelength of 510 nm? Given that the absorbance value of the sample at 510 nm is 0.42, and the molar absorptivity of iron (Fe) at that wavelength is 18,000 M^-1 cm^-1.

asked Jan 30 in Analytical Chemistry by Korey4583669 (270 points)

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1 answer 54 views

What is the concentration of iron (Fe) in a sample of river water using spectrophotometric analysis with a known calibration curve and absorbance of 0.25 at a wavelength of 510 nm? The molar absorptivity of Fe at 510 nm is 8.70 x 10^3 M^-1cm^-1 and the path length of the cuvette used is 1.0 cm.

asked Jan 30 in Analytical Chemistry by LachlanLoton (190 points)

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1 answer 62 views

What is the concentration of iron (Fe) in a given water sample using spectrophotometry?

asked Jan 30 in Analytical Chemistry by YAZMaybelle3 (390 points)

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1 answer 84 views

What is the concentration of iron (Fe) in a given water sample using spectrophotometry with a known absorbance value of 0.52 and molar absorbivity coefficient of 1.20 x 10^4 M^-1 cm^-1 at a wavelength of 565 nm?

asked Jan 30 in Analytical Chemistry by Cheryle42257 (370 points)

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1 answer 70 views

What is the concentration of hydrochloric acid (HCl) in a solution, given that 25 mL of this solution requires 0.10 M sodium hydroxide (NaOH) to reach the equivalence point during a titration?

asked Jan 30 in Analytical Chemistry by HarrisonBelt (490 points)

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