7. Describe the effects that are responsible for the three different absorbance profiles in Figure 9-4 and select three additional elements you would expect to have similar profiles. Ag Mg 2.5 5.0 Height, em FIGURE 9-4 Flame absorption profiles for three elements. 8. For two solutions containing the same concentration of nickel, the atomic absorption at 352.4 nm was about 30% greater for a solution that contained 50% ethanol than for an aqueous solution that contained no ethanol. Explain. 9. Figure 9-1 summarizes many of the processes that take place in a laminar-flow burner. With specific reference to the analysis of an aqueous CaC12 solution, describe the processes that are likely to occur. larner head A lurer head acking ring Autiliary unidant Flow spoiler retaining sce Presre elef vent Nebulier adjeating kab Flow spoiler (Puntin plastic) Sample uli capillary/ Nabuliar Tew FIGURE SSA laminan fow burner. (Courteny of Perkin-Eimer Corporation, Norwalk, CT.) A Absorbance

7. Describe the effects that are responsible for the three different absorbance profiles in Figure 9-4 and select three additional elements you would expect to have similar profiles. Ag Mg 2.5 5.0 Height, em FIGURE 9-4 Flame absorption profiles for three elements. 8. For two solutions containing the same concentration of nickel, the atomic absorption at 352.4 nm was about 30% greater for a solution that contained 50% ethanol than for an aqueous solution that contained no ethanol. Explain. 9. Figure 9-1 summarizes many of the processes that take place in a laminar-flow burner. With specific reference to the analysis of an aqueous CaC12 solution, describe the processes that are likely to occur. larner head A lurer head acking ring Autiliary unidant Flow spoiler retaining sce Presre elef vent Nebulier adjeating kab Flow spoiler (Puntin plastic) Sample uli capillary/ Nabuliar Tew FIGURE SSA laminan fow burner. (Courteny of Perkin-Eimer Corporation, Norwalk, CT.) A Absorbance

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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A liquid sample was analyzed for Fe³+. A plot of absorbance (y-axis) vs. concentration (ppm; x-axis) of the external standards produced a calibration line with an equation y = 0.2256x -0.0903 (R² = 0.9973). The absorbance of the sample was 1.25. Determine the amount of Fe³+ in the sample (in ppm).
Calculate the path length in centimetres which would give an absorbance of 0.134 of a colored dye with a molar absorptivity of 0.759 L mol-1 cm-1 at a wavelength of 645 nm if the concentration of the dye is 6.82x10-2 M. Report your answer to 3 significant figures.
Please show all the calculations with steps and explanations
A calibration curve is made for the absorbance as a function of concentration of blue dye (in mg/L). The slope of the curve is 0.131; the y-intercept is -0.01869; the correlation is 0.993. If a consumer sample has an absorbance of 0.120 on the same instrument, what is its concentration of blue dye, in mg/L? a. 0.034 b. 0.935 c. 0.993 d. 1.06
Iron(III) forms a complex with thiocyanate ion that has the formula Fe(SCN)+2. The complex has an absorption maximum at 580nm. A sample of well water was assayed according to the following scheme: Sample Sample Vol (mL) Oxidizer Fe(ii) (mL) added 2.75ppm KSCN (0.050 M) H20 (mL) Abs @ 580 nm 1 50.00 5.00 5.00 20.00 20.00 .549 2 50.00 5.00 0 20.00 25.00 .231 What is the concentration of Fe in the well water sample?
4 of 15 Abs 2.0 1.5 1.0 0.5 0.25 0. 0.2 0.4 0.6 Concentration (M) With reference to the UV-Vis calibration curve reported above, calculate the concentration (Molar) of a sample whose Absorbance is 1.0. Report your answer with two significant figures.
Given the calibration curve below, what is the limit of linearity? Absorbance 2000 1800 1600 1400 1200 1000 800 600 400 200 0 Ο 0.2 μg/ml Ο 0.4 μg/ml Ο 0.8 μg/ul Ο 1.2 μg/ul 0 Non-linear regresssion ...... 1 Concentration µg/μl 0.2 0.4 0.6 0.8 R²=0.9966 1.2 1.4 1.6
can you explain how I can get 1.596 mg/L of concentration of Fe3+ in dilutes sample and can you also make the calibration curve.
Question 23 Using the given data above, determine the following information: What is the Amax of Jerry? 650 nm O 500 nm O 700 nm O 800 nm
0.10 mM KMnO4 has an absorbance maximum of 0.26 at 525 nm in a 1.000-cm cell. Find the molar absorptivity and the concentration of a solution whose absorbance is 0.52 at 525 nm in the same cell. Watch your units. A. 2.6 M-¹ cm-¹, 0.20 mM B. 2,600 M-¹ cm-¹, 0.20 mM C. 2,600 M-¹ cm-1, 0.05 mm D. Not Enough Information
Operating Wavelength : 462.8 nm Preparation of Standard Calibration Curve of [FeSCN]2+ Sample Number Absorbance Final Concentration of [FeSCN]2+(M) A 0.058 4.0E-5 B 0.174 8.0E-5 C 0.455 1.2E-4 D 0.740 1.6E-4 E 0.833 2.0E-4 Determination of [FeSCN]2+ in Equilibrium Mixtures Sample Number Absorbance 1 0.190 2 0.272 3 0.388 4 0.441 Determination of [FeSCN]2+ in equilibrium mixtures For Sample #1: Calculate the equilibrium concentration of Fe3+.
2. Calculate the molar extinction coefficient of a substance, if known that its concentration equals 0.0744 mmol/L, and measured absorbance is 0.2 at Amax = 235 nm in methanol solvent at 25 °C (assume a 1 cm light pass).