Recent questions in Chemistry

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What is the concentration of lead (Pb) in a soil sample collected from a playground using X-ray fluorescence spectroscopy?

asked Jan 30 in Analytical Chemistry by CorneliusSpe (290 points)

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1 answer 67 views

What is the concentration of lead (Pb) in a drinking water sample using cyclic voltammetry?

asked Jan 30 in Analytical Chemistry by JulissaRusso (330 points)

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1 answer 66 views

What is the concentration of lead (Pb) and cadmium (Cd) in a water sample collected from a polluted river using atomic absorption spectroscopy?

asked Jan 30 in Analytical Chemistry by JavierDallas (210 points)

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1 answer 92 views

What is the concentration of iron(II) sulfate in a sample of water taken from a lake, using spectrophotometry with a known molar absorptivity of 11,300 L/mol*cm, if the absorbance of the sample is measured to be 0.423 at a wavelength of 510 nm?

asked Jan 30 in Analytical Chemistry by ClaudiaChamb (430 points)

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1 answer 71 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 JakeGagner6 (350 points)

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1 answer 87 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 NickolasHarv (350 points)

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1 answer 71 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 DongCarrier (430 points)

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1 answer 61 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 RhysDelgado0 (170 points)

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1 answer 75 views

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

asked Jan 30 in Analytical Chemistry by LeiaLuong327 (390 points)

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1 answer 70 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 PrinceHavila (270 points)

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1 answer 69 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 NannieKling5 (390 points)

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1 answer 75 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 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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1 answer 83 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 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 70 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 76 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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