A 2.78 ✕ 10−4 M solution of a compound has an absorbance of 0.417 at 520 nm in a 1.00 cm cell. The solvent's absorbance under the same conditions is 0.020. (a) What is the molar absorptivity of the unknown compound? M -1cm-1 (b) What is the concentration of the compound in a solution, if the absorbance of the solution in a 1.00 cm cell at 520 nm is 0.391? M

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A: (a) Given,

Q: A mixture is prepared by combining 10.72 mL of 2.52 x 10-3 M Fe(NO3)3 with 10.00 mL of 1.76 x 10-3 M…

A: Given that: Initial concentration of Fe(NO3)3 is 2.52 x 10-3 M. Volume of Fe(NO3)3 solution is 10.72…

Q: The molar absorptivities of an indicator HIn (Ka = 4.6 × 10-5) and its conjugate base In− at 630 nm…

A: The expression of beer's law is shown below: A =εbc where; ε = molar absorptivity b = path length c…

Q: A student collects the following data for the absorbance of a complex measured in 1.00 cm…

A: Absorbance ( A ) = molar absorptivity ( ε) x concentration(c) x path length (l)         or, A = εcl…

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A: We would use formula of absorbance given as :  A = ECl  where, E is molar absorptivity which depends…

Q: A solution in part C initially contains (4.2100x10^-4) molar SCN¯ and (3.1700x10^-3) molar Fe3+.…

A:

Q: A student measures k for a certain blue dye to be 400.4 M-1 at 560 nm. What is the molarity of the…

A: According to the Beer's law the absorbance of any substance is directly proportional to the…

Q: (c) Suppose this 0.05 M stock solution was left on the counter, open, overnight before generating…

A: The Solution of CoCl2 is stored at 4 to -20°C for the stability of the concentration. As the…

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A:

Q: Auzure II is a dye with a molar absorptivity (ε657) of 8.13×104 L/mol·cm when measured at 657 nm.…

A: Given   Wavelength is 657 nm. Concentration is 4.50×10-6 M or 4.50×10-6 mol/L. Molar absorbtivity is…

Q: concentration for a solution having an absorbance of 0.350 and a molar absorptivity of 420 L mol-1…

A: Absorbance is directly proportional to concentration

Q: 1) Balance the following in acidic solution: (a) H2O2 + Sn²+ + H2O + Sn*+ (b) PŁO2 + Hg → H* + P&+…

A: Given: Some Reactions are given To find: Balance the given Reaction in acidic medium  Solution:…

Q: A standard iron solution was prepared by dissolving 0.0140 g of pure iron in acid then transferring…

A:

Q: At 580 nm, which is the wavelength Fe(SCN) has a molar absorptivity of 7.00 x 10' 1. cm' mot.…

A: Given that, at 580 nm wavelength The molar absorptivity is ε = 7.00×103 L.cm-1.mol-1. (a) We have to…

Q: 4. Calculate the expected absorbance of solution of a 5.50x10-6 M solution of Blue # measured at 629…

A: Given  concentration = 5.50 ×10-4 M cell length (l) = 1.5 cm   molar  absorptivity  = 1.30 ×105…

Q: You measured the absorbance of a solution of 0.2 mM NADH at 340 nm and the reading was 0.55.…

A:

Q: Calculate the absorbance of 0.00038 moles in 24.2 mL of solution given the molar absortivity is 1168…

A:

Q: A solution in part C initially contains (4.1000x10^-4) molar SCN¯ and (1.180x10^-1) molar Fe3+. This…

A: Given that: absorbance = 5.150×10-1  initial concentration of Fe3+ = 1.180×10-1 M initial…

Q: What is the absorbance of a theoretical compound in a 5.26 x 10-5 M solution, a path length of 1.5…

A: The relationship between the absorbance and concentration is given by  A = ECl where A = absorbance…

Q: A solution containing the complex formed between Bi(III) and thiourea has a molar absorptivity of…

A: The Beer-Lambert Law states that the absorbance of a solution is proportional to the concentration…

Q: What

A: As, you haven't provided value of ε It is solved using, ε=10,800 M-1.cm-1 We know that  A=εlc

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A: Hollow Cathode lamps are ideal source of spectral lines that are used for testing in laboratories.…

Q: A solution in part C initially contains (4.0300x10^-4) molar SCN¯ and (2.880x10^-3) molar Fe3+. This…

A: We have to calculate the equilibrium constant.

UV Visible Spectroscopy

Spectroscopy refers to the absorption or emission of light or other radiations by matter. When a substance or chemical absorbs light or radiation, they reach an excited state followed by de-excitation or emission of the light or radiation forming distinct spectra. UV-visible spectroscopy or  ultraviolet-visible refers to the absorption and emission in the ultraviolet and visible regions of the electromagnetic spectrum.