Chapter 7: Titration Curve Excel File | CHM 214 | 072
TLDRThe video script discusses a titration curve exercise involving the titration of chloride with silver, using equation 7-12 from the textbook. It explains the process of setting up a spreadsheet with inputs such as Ksp, initial volume, and concentrations of the solutions. The video demonstrates how to calculate the concentration of silver and chloride using Ksp and how to plot the titration curve, highlighting the equivalence point. It also shows how to adjust the PAG values to find where the concentration change occurs and how Excel's features can be used to automate the calculation and plotting of the curve.
Takeaways
- ๐ The script discusses a spreadsheet example related to a titration curve, specifically the titration of chloride with silver.
- ๐ The titration curve is based on the equation 7-12 from the textbook, which was derived in a previous video.
- ๐งช Key inputs for the titration calculation include the Ksp value of the salt formed, initial volume of the chloride solution, and the initial concentrations of the chloride (0.1) and silver (0.05) solutions.
- ๐ The concentrations of silver and chloride are directly related to each other through the Ksp value, which is used to calculate their concentrations during the titration process.
- ๐ The script describes the typical titration curve, with a sharp change in concentration at the equivalence point, which is observed at a volume of 50 in the example.
- ๐ When plotting the curve, it's clearer to use a logarithmic scale (pag scale) instead of a linear scale to observe the changes in concentration.
- ๐ง The process of finding the correct pag value involves trial and error, starting with an initial guess and adjusting until the volume (vm) equals zero.
- ๐ ๏ธ Excel is used as a tool to perform calculations and plot the titration curve, with the ability to copy formulas and automatically fill in values for a series of data points.
- ๐ The spreadsheet automatically calculates and fills in the titration curve, showing the equivalence point where the concentration changes rapidly.
- ๐ The script emphasizes the importance of understanding the titration curve and the relationship between the concentrations of the reactants in a chemical reaction.
- ๐ The spreadsheet example will be available on Moodle for further study and to replicate the process demonstrated in the script.
Q & A
What is the titration curve based on in the provided example?
-The titration curve is based on the titration of chloride with silver, as discussed in the earlier chapter and videos.
What equation from the textbook is used to calculate the titration curve?
-The titration curve is calculated using equation 7-12 from the textbook.
What are the necessary inputs for the calculation?
-The necessary inputs include the Ksp value of the salt formed, the initial volume of the chloride solution, and the initial concentrations of the chloride and silver solutions.
What are the initial concentrations given for the chloride and silver solutions?
-The initial concentration for the chloride solution is 0.1 and for the silver solution, it is 0.05.
How are the concentration of silver and chloride related to each other?
-The concentration of silver and chloride are directly related to each other through the Ksp value.
What does the concentration curve show?
-The concentration curve shows the typical titration curve, with the equivalence point at 50 and a sharp change in concentration at this point.
Why is it difficult to see the change in concentration at the equivalence point on a non-logarithmic scale?
-On a non-logarithmic scale, the change in concentration at the equivalence point is difficult to see because the concentration of silver is essentially zero until the equivalence point is reached, after which it increases rapidly.
How can you find the correct starting PAG value for the titration curve?
-The correct starting PAG value is found by trial and error, adjusting the value until the VM (volume change) is approximately zero.
What is the significance of the equivalence point in the titration curve?
-The equivalence point is significant because it is where the concentration starts changing quite rapidly, indicating the point at which the reaction is complete.
How can Excel be used to automate the calculation of the titration curve?
-Excel can be used to automate the calculation by selecting the values and formulas, and then dragging the bottom right corner to copy and fill in the rest of the cells automatically.
What happens when you extend the titration curve beyond the equivalence point?
-When you extend the titration curve beyond the equivalence point, the concentration continues to increase, and the curve starts to resemble the one shown earlier in the discussion.
Outlines
๐ Spreadsheet Analysis of Titration Curve
The paragraph discusses a spreadsheet example related to the titration of chloride with silver, which will be accessible on Moodle for further study. It explains the use of the titration curve derived from a previously discussed equation (7-12) in the textbook. The key inputs required for this calculation include the solubility product constant (ksp), initial volume of the chloride solution, and the initial concentrations of the chloride and silver solutions, which are 0.1 and 0.05 respectively. The paragraph further describes how the concentrations of silver and chloride are interrelated through ksp and how to calculate them. It also illustrates the process of plotting the titration curve, highlighting the equivalence point at 50 and the sharp change in concentration at this point. The use of logarithmic scale (pAg vs. volume) is also discussed to show the concentration changes more clearly. The paragraph concludes with a trial and error method to find the pAg value where the volume change (โV) equals zero, ultimately resulting in the identification of the pAg value as 8.7.
๐ Continuing the Titration Curve Analysis
This paragraph continues the discussion on the titration curve analysis, focusing on the equivalence point and the behavior of the curve beyond this point. It explains how to extend the curve beyond the equivalence point and observes the curve reaching 54, resembling the previously shown curve. The paragraph emphasizes that the spreadsheet used for this analysis will be available for review, allowing the audience to understand the detailed steps and calculations performed. It reiterates the importance of understanding the titration curve and its characteristics, such as the rapid change in concentration at the equivalence point, which is a key aspect of the titration analysis.
Mindmap
Keywords
๐กtitration curve
๐กksp
๐กinitial volume
๐กconcentration
๐กequivalence point
๐กlogarithmic scale
๐กpag value
๐กtrial and error
๐กExcel
๐กequation 7-12
๐กconcentration of chloride
Highlights
The transcript discusses a spreadsheet example related to titration curves.
The titration curve is for the reaction between chloride and silver, calculated using equation 7-12 from the textbook.
Inputs required for the calculation include the Ksp value of the salt formed, initial volume of the chloride solution, and concentrations of chloride and silver solutions.
The concentration of silver is directly related to the PAG value, while the concentration of chloride can be determined using the Ksp value.
Equation 7-12 is derived from the previous video and is used to calculate the titration curve.
The equivalence point of the titration is visible at a volume of 50.
A logarithmic scale is used to plot the titration curve, making the sharp change in concentration at the equivalence point clearer.
The process of finding the correct PAG value involves trial and error to achieve a VM (volume) that equals zero.
Excel's features allow for easy manipulation and copying of formulas, which helps in plotting the titration curve.
The titration curve shows a rapid change in concentration at the equivalence point, which is a key aspect of the curve.
The spreadsheet example will be available on Moodle for further study and analysis.
The method demonstrated in the transcript is practical for understanding and visualizing titration reactions.
The use of PAG values versus volume provides a different perspective on the titration curve compared to using p values.
The spreadsheet is a tool for learning and homework, allowing students to interact with the titration curve and understand its dynamics.
The example serves as an educational resource for students to apply theoretical concepts to practical calculations and visualizations.
The process of adjusting PAG values to find the equivalence point demonstrates the iterative nature of scientific problem-solving.
The transcript provides a comprehensive guide on how to set up and use a spreadsheet for titration curve analysis.
Transcripts
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