4. A solution containing complexes of Bi (III) and thiourea has a molar absorptivity of 9.32 x 103 L/cm.M at 470 nm. Calculate the absorbance of a 6.24 x 10-5 M solution in a 1.00 cm cell. O 58.15 x 10-2 O 5.815 x 109 O 1.494 x 108 O 5.815 x 10-7
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- In a pharmaceutical industry a drug Paracetamol (151.163 g/mol) is determined in a sample. A 0.0315 g samples was reacted with methanol and diluted the solution to 1 L. the solution λ max at 243 nm (ε=2.6×104 cm-1 mol-1 L). The solution exhibits an absorbance of 0.642 in a 2 cm cell. Calculate the percentage paracetamol in the sample.Calaculate the initial concentration of [Fe3+] and [SCN-] of a solution with 5 mL of 0.002 M Fe(NO3)3, 2 mL of 0.002 M KSCN, 3 mL of water, and an absorbance of 0.221.Calculate the molar absorptivity and absorbance of a 1.00 x 104 M solution, which has atransmittance of 32.1% , when the path length is 2.5 cm at 650 nm. (
- In the determination of iron in fortified cereals by atomic absorption, 0.9133 g of sample was weighed. After a previous treatment, it was dissolved and diluted to 100 mL, an aliquot of 25.0 mL was taken, this was diluted to 100 mL and this solution presented an absorbance reading of 0.251. A series of iron standards of the following concentrations were prepared: 0.0; 1.0; 2.0; 2.5 and 3.0 ppm. Whose absorbances were 0.0; 0.241; 0.405; 0.520 and 0.640. Determine the iron concentration in mg/100 g of sample.Give the solutions of the following;1. Calculate the effective absorptivity and molar absoptivity for manganese is a potassium permanganate solution that contains 0.10g of manganese in 100 mL has an absorbance of 0.434 using a 1.5 cm cell at a wavelenght of 550 nm. Molar Mass: Mn=54.94Answer: Effective absorptivity= 2.89 cm-1 g-1 L ; mOLAR ABSOPTIVITY= 159 cm-1 mol-1L 2. Manganese is determined colorimentrically as permanganate by measuring the absoprtion of monochromatic green light. A standard solution in an absoption cell 5.00 cm long absorbs 10.0% of the light, while an unknown sample in a cell 1.00 cm long absorbs 50.0% of the light. The standard solution contains 2.00 mg of Mn per liter. What is the concentration (g/L) of the Mn in the unknown? Ans= 0.0657 g/L3. The drug tolbutamine (mm=270) has a molar absorptivity of 703 AT 262 nm. One tablet is dissolved in water and diluted to a volume of 2L. If the solution exhibits an absorbance in the UV region at 262 nm equal to 0.678…Solutions of cobalt (II) ions have a magenta color with a molar absorptivity constant (e) value at 511 nm of 5.87 M-1cm-1. A 0.500 mL sample is transferred from a 50.0 mL stock solution of Co(NO3)2 and diluted with water to a final volume of 7.50 mL. The dilution had an absorbance value at 511 nm in a standard cuvette (1.00 cm light path) of 0.382. Calculate the mass of Co(NO3)2 contained in the original 50.0 mL stock solution.
- The absorbance of 10 mL of 0.0005 M Co2+ solution is 0.35. 10 mL of this solution mixed with 10 mL of the sample solution produces an absorption of 0.52. Calculate the concentration of Co2+ in the sampleA 0. 6875 g rock sample containing an unknown amount of Ca was dissolved in HCl and diluted to 200.00 mL. Aliquots of 20 mL of this unknown solution were added to different volumes of a 8.02?g/mL Ca standard solution and diluted to 100.00 mL. A plot of absorbance vs. concentration of standard gives a trendline of with slope of 1746. 7. The solution of 20 mL of unknown diluted to 100 mL and without any standard gave an absorbance of 215.8. Find the weight percent of Ca in the rock.A 20 ml aliquot of drinking water containing Fe(II) and Fe (III) is treated with hydroquinone to reduce all dissolved iron to Fe(II),0- phenanthroline is added and the aliquot is diluted to 50 ml and the absorbance in a 2.00 cm cell is 0.085 at 510 nm. Calculate the iron content of the water as ppm? ε = 1.11 x 104 L/mol cm
- Calculate the molar absorptivity of a 1.00 x 10-4 M solution, which has an absorbance of 0.372, when the path length is 2.5 cm.The nitrite in a series of standard solutions (mg/L, n = 5) are converted to azo dye and the slope of the calibration curve is 2.0 ppm1. A 10.00-mL mineral water sample is treated in the same way as standards and diluted to a final volume of 100.00-mL. It gives an absorbance of 0.80. The absorbance of blank solution under the same conditions is 0.10. Calculate ppm (mg/L) of NO2 (46 g/mol) and the molarity of NANO2 (69 g/mol) in the original sampleA compound having molecular weight 151.163 g/mol is determined in asample. A 0.0302 g sample was dissolved in an aqueous solvent anddiluted the solution to 1 L. The solution has λ max at 243 nm (ε=2.6×104cm-1 mol-1 L). The solution exhibits an absorbance of 0.642 in a 2 cm cell.Calculate the percentage of the above compound in the sample.