Draw a calibration curve using the data set given below. Show and explain LOD and LOQ. Determine the dynamic linear range by examining the linearity of the absorbance measurements against Metal atoms concentration. Also Explain calibration methods. (hint: there are there types of methods. These are internal, external and standard addition methods) Metal, ppm Absorbance 0.220 0.044 0.440 0.090 1.100 0.228 2.200 0.465 4.400 0.932 6.600 1.187

What is the extinction coefficient for the following absorbances?  1. 3.000 2. 2.022 3.1.2025 4. 0.824 Would the units be in µmoles/mL)^-1 cm^-1

In the figure below we present two curves. The sample to multilayers of graphene. The technician who obtained the spectra does not know how many layers each curve corresponds to. But you do. answer the following: a. With what technique were the spectra obtained?

Briefly describe how a phase-contrast microscope work and the kind of image that itproduces. Give a specific use for this type of microscope.

A solution in part C initially contains (4.2100x10^-4) molar SCN¯ and (3.1700x10^-3) molar Fe3+ This solution was then measured using the colorimeter, and an absorbance of (5.01x10^-1) was recorded.The constant determined in part A of the experiment was found to be (3.4800x10^3). Using the data provided above, determine the equilibrium concentration of Fe3+ [Fe3+ ]e in this solution. Note: Your answer is assumed to be reduced to the highest power possible. Your Answer: x10 Answer units

.Express the following absorbances in terms of percent transmittance a) 0.0356 b) 0.379 0.167 c) 0.485

Flame Atomic Absorption Spectroscopy (FAAS) method is selected due to its wide applicability for metal ion analysis in drinking water samples. Discuss how can we determine the concentration of selected heavy metals (Cu and Cr) in the unknown tap water sample.

The spectrophotometer is used to measure absorbance experimentally. Briefly, explain how this is accomplished.

Flame Atomic Absorption Spectroscopy (FAAS) method is selected due to its wide applicability for metal ion analysis in drinking water samples. Title: Determine the concentration of selected heavy metals (Cu and Cr) in the unknown tap water sample.  Question: Discuss.

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 Absorbance