Answered: Absorbance Absorbance Absorption…

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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$**Title: Understanding Absorption Profiles and Concentration through Beer’s Law** **Introduction:** This educational resource focuses on interpreting absorption spectra and utilizing Beer’s Law to determine concentrations of solutions, specifically using Cobalt (II) chloride as an example. **Figure 1: Absorption Profile for Cobalt (II) Chloride** - **Graph Description:** The graph shows the absorption spectrum of CoCl$_2$.6H$_2$O, with wavelengths on the X-axis (ranging from 360 nm to 700 nm) and absorbance on the Y-axis (ranging from 0 to approximately 0.5). The data points form a curve that peaks, indicating maximum absorbance. - **Instructions:** 1. Place an arrow at the maximum absorbance value on the graph and note the corresponding wavelength (λ$_{\text{max}}$) including the unit. **Figure 2: Cobalt (II) Chloride Standard Curve (Beer’s Law Plot)** - **Graph Description:** This is a Beer’s Law plot of CoCl$_2$.6H$_2$O at λ$_{\text{max}}$ = 560 nm. The X-axis represents concentration (M) ranging from 0 to 0.05, while the Y-axis shows absorbance values up to 0.1. A linear trend line is present with the equation $y = 1.8571x + 0.0038$. - **Instructions:** 1. Determine the concentration of an unknown solution of Cobalt (II) chloride with an absorbance of 0.25 using two methods: - **Method 1: Extrapolation** (mark the concentration on the plot). - **Method 2: Calculation** (show your work). Please ensure to follow the instructions and carry out proper calculations to comprehend the principles behind these analytical techniques. **Course Information:** - Course Code: CHM 111 - March 2021, Life University **References:** - [www.uconline.instructure.com](http://www.uconline.instructure.com)$

Transcribed Image Text:**Title: Understanding Absorption Profiles and Concentration through Beer’s Law** **Introduction:** This educational resource focuses on interpreting absorption spectra and utilizing Beer’s Law to determine concentrations of solutions, specifically using Cobalt (II) chloride as an example. **Figure 1: Absorption Profile for Cobalt (II) Chloride** - **Graph Description:** The graph shows the absorption spectrum of CoCl$_2$.6H$_2$O, with wavelengths on the X-axis (ranging from 360 nm to 700 nm) and absorbance on the Y-axis (ranging from 0 to approximately 0.5). The data points form a curve that peaks, indicating maximum absorbance. - **Instructions:** 1. Place an arrow at the maximum absorbance value on the graph and note the corresponding wavelength (λ$_{\text{max}}$) including the unit. **Figure 2: Cobalt (II) Chloride Standard Curve (Beer’s Law Plot)** - **Graph Description:** This is a Beer’s Law plot of CoCl$_2$.6H$_2$O at λ$_{\text{max}}$ = 560 nm. The X-axis represents concentration (M) ranging from 0 to 0.05, while the Y-axis shows absorbance values up to 0.1. A linear trend line is present with the equation $y = 1.8571x + 0.0038$. - **Instructions:** 1. Determine the concentration of an unknown solution of Cobalt (II) chloride with an absorbance of 0.25 using two methods: - **Method 1: Extrapolation** (mark the concentration on the plot). - **Method 2: Calculation** (show your work). Please ensure to follow the instructions and carry out proper calculations to comprehend the principles behind these analytical techniques. **Course Information:** - Course Code: CHM 111 - March 2021, Life University **References:** - [www.uconline.instructure.com](http://www.uconline.instructure.com)

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