of students made 5 standard solutions and measured their corresponding absorbance values at group a wavelength of 525.0 nm to generate the graph below. Absorbance of Standard Solutions to Find Concentration of Unknown X Solution 0.50 y = 75.9x + 0.0045 R? = 0.9946 0.40 0.30 0.20 0.10 0.00 0.001 0.002 0.003 0.004 0.005 0.006 Concentration of X (mole/L) The colorless reactants V and W form unknown X from the reaction: 2V + W S X A solution is prepared by mixing together the following: Volume 0.0150 M V (mL) Volume 0.0150 M W (mL) 6.00 4.00 This solution reaches equilibrium, and then is placed in a 1.00 cm wide cuvet and inserted into the spectrometer, producing an absorbance reading of 0.275 at a wavelength of 525.0 nm. Calculate Keg for the above reaction, including units. Absorbance
of students made 5 standard solutions and measured their corresponding absorbance values at group a wavelength of 525.0 nm to generate the graph below. Absorbance of Standard Solutions to Find Concentration of Unknown X Solution 0.50 y = 75.9x + 0.0045 R? = 0.9946 0.40 0.30 0.20 0.10 0.00 0.001 0.002 0.003 0.004 0.005 0.006 Concentration of X (mole/L) The colorless reactants V and W form unknown X from the reaction: 2V + W S X A solution is prepared by mixing together the following: Volume 0.0150 M V (mL) Volume 0.0150 M W (mL) 6.00 4.00 This solution reaches equilibrium, and then is placed in a 1.00 cm wide cuvet and inserted into the spectrometer, producing an absorbance reading of 0.275 at a wavelength of 525.0 nm. Calculate Keg for the above reaction, including units. 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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 <!-- Note: Replace with real image link -->
**Description:**
- **X-axis:** Concentration of X (mole/L)
- **Y-axis:** Absorbance
- **Best Fit Line Equation:** \( y = 75.9x + 0.0045 \)
- **R-squared Value:** \( R^2 = 0.9946 \)
The graph shows a linear relationship between the concentration of X (mole/L) and the absorbance, with the line equation given above.
#### Reaction
The colorless reactants V and W form unknown X from the reaction:
\[ 2V + W \rightleftharpoons X \]
#### Preparation of Solution
A solution was prepared by mixing the following volumes:
| Volume 0.0150 M V (mL) | Volume 0.0150 M W (mL) |
|------------------------|------------------------|
| 6.00 | 4.00 |
#### Experimental Data
This solution reached equilibrium and was then placed in a 1.00 cm wide cuvet for measurement. The spectrometer provided an absorbance reading of 0.275 at a wavelength of 525.0 nm.
#### Calculation of \( K_{eq} \)
1. **Calculate the concentration of X using the calibration curve:**
Given:
\[ \text{Absorbance (A)} = 0.275 \]
Using the best fit line equation:
\[ A = 75.9 \cdot [X] + 0.0045 \]
Solving for \([X]\):
\[ 0.275 = 75.9 \cdot [X] + 0.0045 \]
\[ 75.9 \cdot [X] = 0.275 - 0.0045 \]
\[ 75.9 \cdot [X] = 0.2705 \]
\](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fda7693ac-42ba-43da-875a-8ee9e0eebed9%2F50832a4f-4ba3-486b-af1e-a51a04cb7889%2Feoimx4e_processed.png&w=3840&q=75)
Transcribed Image Text:### Determination of Equilibrium Constant \( K_{eq} \)
#### Experimental Background
A group of students prepared 5 standard solutions and measured their corresponding absorbance values at a wavelength of 525.0 nm. These values were then used to generate the calibration graph illustrated below.
#### Calibration Graph
**Title:** Absorbance of Standard Solutions to Find Concentration of Unknown X Solution
 <!-- Note: Replace with real image link -->
**Description:**
- **X-axis:** Concentration of X (mole/L)
- **Y-axis:** Absorbance
- **Best Fit Line Equation:** \( y = 75.9x + 0.0045 \)
- **R-squared Value:** \( R^2 = 0.9946 \)
The graph shows a linear relationship between the concentration of X (mole/L) and the absorbance, with the line equation given above.
#### Reaction
The colorless reactants V and W form unknown X from the reaction:
\[ 2V + W \rightleftharpoons X \]
#### Preparation of Solution
A solution was prepared by mixing the following volumes:
| Volume 0.0150 M V (mL) | Volume 0.0150 M W (mL) |
|------------------------|------------------------|
| 6.00 | 4.00 |
#### Experimental Data
This solution reached equilibrium and was then placed in a 1.00 cm wide cuvet for measurement. The spectrometer provided an absorbance reading of 0.275 at a wavelength of 525.0 nm.
#### Calculation of \( K_{eq} \)
1. **Calculate the concentration of X using the calibration curve:**
Given:
\[ \text{Absorbance (A)} = 0.275 \]
Using the best fit line equation:
\[ A = 75.9 \cdot [X] + 0.0045 \]
Solving for \([X]\):
\[ 0.275 = 75.9 \cdot [X] + 0.0045 \]
\[ 75.9 \cdot [X] = 0.275 - 0.0045 \]
\[ 75.9 \cdot [X] = 0.2705 \]
\
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, chemistry and related others by exploring similar questions and additional content below.![em1.png Part 3: Q9 Average absorbance Flask 8 Flask 9 Flask 10 1:1 Ratio so, Flask 11 Part 3: Q Flask 8 Flask 9 Flask 10 Flask 11 Part 3: Q10 Flask 8 Flask 9 Flask 10 Flask 11 Part 3 0.146 0.166 [Fe] -0.002mol/L 0.215 0.294 [FESCN³mol/L) 4.59% 10 5.18*10* 6.64*10* 9.08*10* [FXmol/L) 5.00 *10* 5.00*10* Y=3362x-0.0083 R² = 0.9993 5.00*10* 5.00*10* (Amounts of flask 8 (9 - 11's values are in the spreadsheet) 71% volume 5.00mL Molarity of Fe(NO3))3 = 0.2M Volume of Fe(NO3))3 = 5.00mL Moles of Fe³= Molarity x volume(L) Moles of Fe¹ = 0.2M X 0.005L = 1x10-³mole x [SCN][mol/ 4x10 5×10-4 7x10 1×10 1 Concentration of Fe³ = mole of Fe³ Volume mole of Fe³1x10³ mole G.O05L 8, Average absorbance for solution 8 (same for 9 - 11) Average absorbance for flask 8 = sum of all absorbances / number of readings (0.145 +0.147 +0.148) 3 Using equation of calibration curve's line(slope) of best fit, the average absorbances of the unknown concentrations to determine [FeSCN-Jat equilibrium in solution 8:…](/questions-and-answers/em1.png-...-part-3-q-average-absorbance-flask-and-11-ratio-so-flash-d-flask-10-flask-11-part-3-q-fla/c9657571-599f-4ed4-a5e6-fabcbd26b888){kind=link}
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