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- Unrounded Rounded ε∗,L/μmol 0.0259825 0.0260 Heres the data if needed: TZ # Concentration Absorbance at 430 nmnm 1 33.6480 0.931 2 25.2360 0.757 3 16.8420 0.210 4 8.41200 0.137 5 4.20600 0.122To test a spectrophotometer’s accuracy, a solution of 60.06 ppm K2Cr2O7 is prepared and analyzed. This solution has an expected absorbance of 0.641 at 350.0 nm. Several aliquots of the solution produce the following absorbance values. 0.640 0.638 0.640 0.639 0.640 0.639 0.638 is there any significant difference between the experimental mean and the expected value at a 99.9% confidence level? Question 21 options: Yes because tcal<tcritical Yes because tcal>tcritical No because tcal<tcritical No because tcal>tcritical3. The lead in a swab sample, lead standards, together with a blank were made up in 5.00 mL volumetric flasks using 0.2 % HNO3. 20 μL aliquots of these solutions were injected into the spectrophotometer and the absorbance measured at 217 nm. The following results were obtained. lead / ppb Absorbance 0 0.0591 10.00 0.0858 50.00 0.1926 100.0 0.3260 150.0 0.4594 200.0 0.5929 Swab sample 0.3700 (a) Determine the amount of lead in the swab sample in μg.
- A solution of potassium permanganate of unknown concentration was analyzed against a standard of various concentrations. What is the concentration of KMNO4 if its absorbance is 0.678? Table 1. Data for the Standard Calibration Curve KMNO4 Standard Solution (mol/L) Absorbance at 525 nm 0.000400 0.112 0.000800 0.295 0.000120 l0.443 0.000160 0.701 0.00200 0.932 O 0.00173 M 0.00194 M O 0,00189 O 0.00155 MThis graph shows an absorbance vs concentration curve for Co2*(aq) solution. Sample Standard Curve 1.20 1.00 800 .600 a 400 e 200 20 02 0 080 100 Co2. conc. (M) .020 040 OGO 120 140 160 • Slope - 6.414 Intercept -7.799991E 03 Con. Coef - 9791 Assuming that Beer's Law holds, A = Elc, and the cuvette was a standard 1-cm optical path, what is the molar absorptivity coefficient for the Co2* solution? a. 3.58 x 103 cm" o b.3.58 x 103 cm M-1 OC 7.80 x 103 cm1M-1 O d. 6,414 cm1M1A solution is prepared by diluting 2.79 mL of the blue dye stock solution to 25.00 mL. The measured absorbance for the prepared solution is: Blue dye stock solution = 0.293 M Absorbance at 630 nm = 0.00265 Calibration curve y = 0.0833x A.) What is the theoretical molar concentration? B.) What is the experimental molar concentration? C.) What is the percent error?
- A solution has an absorbance reading of 0.238 AU. Using the calibration curve below, determine the concentration of the solution. Calibration Curve 0.3 0.25 y-657.55x+ 0.017 R-0.9991 0.2 0.15 01 0.05 0.00E-005.00E-051.00E-04150E-042.00E-04250E-043.00E-O43.50E-044.00E-044. SOE-04 Concentration (M) Answer: Absorbance (AU)The absorbance of an unknown dye solution is measured to be 1.06 by a spectrometer. The calibration plot of the spectrometer is provided below. What is the molar concentration of the unknown sample (in mole L)? Absorbance vs. Molarity 18 y3 67024x-0.0343 16 14 12 1 0.8 0.6 0.4 0.2 01 0.2 0.000005 00001 0000015 Concentration of solutions, mol/L 0.00002 0.000025 000003 0 163e-5 O 2.35e-6 0 163 0 235 AbsorbanceTube #: 2 3 4 mL 0.0120 M Pb(NO,), 5.00 5.00 5.00 5.00 2.00 3.00 4.00 5.00 mL 0.0300 M KI mL 0.20 M KNO, 3.00 2.00 1.00 0.00 Total vol. (mL) 10.00 10.00 10.00 10.00 Absorbance of soln. 0.381 0.420 0.470 0.542 [I] at equilibrium (M)
- More Information on Chem21Labs graphs. Slope = 1452.0.... Yint = -0.021856.... R? = 0.99662 Mouse Coordinates: Absorbance vs Concentration 0.8 0.7 0.6 0.5 04 03 0.2 01 0- 0.00005 0.00010 0.00015 0.00020 0.00025 0.00030 0.00035 0.00040 000045 0.00050 0 00055 Concentration (M) Report the Slope of the best-fit line for the Calibration Curve NG 0.25 Info AbsorbanceA student prepared this calibration curve: Absorbance 0.6 0.5 0.4 0.3 0.2 0.1 0 Beer's Law Plot: Cobalt (II) Nitrate Standards 0.0000 0.0200 y = 5.5185x -0.0114 R² = 0.9995 0.789 M 0.0283 M 0.9997 M 0.0242 M 0.0400 0.0600 Concentration (M) 0.0800 0.1000 0.1200 Linear regression of the data yields an equation of y = 5.5185x-0.0114 with R² = 0.9995 What is the Molarity of an Unknown Solution that has Absorbance = 0.145An impurity in water has an extinction coefficient of 3.45 * 103 M-1 cm-1 at 280 nm, its absorption maximum(A Closer Look, p. 576). Below 50 ppb, the impurity is not a problem for human health. Given that most spectrometers cannot detect absorbances less than 0.0001 with good reliability, is measuring the absorbance of a water sample at 280 nm a good way to detect concentrations of the impurity above the 50-ppb threshold?