CHM 115L RS W5 Acids Bases I Fa20 PDF

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Summary

Summary report for Acids Base 1 experiment....

Description

Name:

Clarissa Verduzco

Section:

M1230

Date:

10/25/20

CHM-115L Acid-Base I Lab Worksheet Instructions 1. Type all data, descriptions, results, sample equations, and calculations. Calculations maybe done by hand but must be inserted as an image that meets the requirements posted. 2. Submit electronically to the Loud Cloud assignment box. The instructor may also require paper submissions. 3. Submit copies of the notebook pages for the lab to your instructor. Make sure that all of the data/results reported on worksheet are also in the notebook. These will not be returned. 4. For more specific guidelines and suggestions refer to the CHM115L Worksheet Guide. 5. Remember you must do your own work. Copying and pasting, even from a lab partner is considered cheating and students being caught will be penalized up to and including the filing of a charge of academic misconduct.

Warning: Activities on the first day of class are the only times you are allowed to use these worksheets in class! Item

Item Copies of notebook pages containing procedure and data recorded during lab. These are submitted at the end of Lab before the student leaves. Submission of these sheets is important because they are used to calculate the notebook check grade. Notebook pages – calculations and analysis. These are submitted in the class period with when the summary report is turned in online This report. Name, Section, and Date in the file header.

Activities a) Video Activity Enter the information for the titrating an acid video.

Titrating an Acid Video Report

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Title of Video

Name:

Clarissa Verduzco

Section:

M1230

Date:

10/25/20

Titration of Acids and Bases

Producer

Bio-Rad Laboratories

URL for video Summary of how to use Buret

https://www.youtube.com/watch?v=5BZ0MPlgeEE Set up titration apparatus clamp the burette to stand so it is vertical with the stopcock. Using a pipette fill buret with the base of unknown concentration. Place a piece of paper under flask to determine the change in color slowly add solution to buret by turning the stopcock parallel. Solution should turn pink which disappears when you stir it. Continue to add solution until the pink takes longer to fade. When the solution stays pink that means the acid has been neutralized. Entire titration should be done two times.

b) Enter the information about the solutions used in the titration. Solution Used

Concentration

Bottle ID information

1. Titration Curves a) Insert here a copy of the titration curve created using student acquired data. Make sure that axes are labeled including units and include a legend and a title. Student MUST create and report a plot of the data taken, even if it is incomplete. Failure to do so will result in the loss of ALL points for this section.

Acid base data set a 14 12 10 8 6 4 2 0

0

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60

80

100

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120

Name:

Clarissa Verduzco

Section:

M1230

Date:

10/25/20

b) Insert here a copy of the any additional titration plot(s) created, even if the data set is incomplete. Make sure that axes are labeled including units and include a legend and a title. The determined equivalence point should also be labeled on the graph. Students must include the derivative plot as well. This must be on a separate plot. Student MUST create and report a plot of the data taken, even if it is incomplete. Failure to do so will result in the loss of ALL points for this section. If no or insufficient accurate titration data was obtained proceed to section (c)

Data set B 14 12 10 8 6 4 2 0

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120

Acid Base Data Set C 14 12 10 8 6 4 2 0

0

10

20

30

40

50

60

2. Equivalence Points © 2017. Grand Canyon University. All Rights Reserved.

70

80

Name:

Clarissa Verduzco

Section:

M1230

Date:

10/25/20

Record the volume and the pH where the equivalence point has been determined based on graphical and derivative methods. Run

Graphical

Equivalence Points (Volume and pH) Derivative

3. Concentration of HCl For each method used to determine the equivalence point, report the HCl concentration determined for each trial and the average. Method Graphical

Rapid

Accurate

Derivative

4. Post-Lab Questions 1. How reproducible were the concentration values determined for each of the three trials? What was the range of values obtained?

2. What, if any, differences were observed in the determination of the equivalence point using the graphical and derivative methods?

3. Instead of using a pH probe a laboratory technician uses phenolphthalein indicator to determine when the titration is

© 2017. Grand Canyon University. All Rights Reserved.

Name:

Clarissa Verduzco

Section:

M1230

Date:

10/25/20

complete. They know that this occurs when the solution turns pink, and that the pH will be 8.2. Using one of the titration curves obtained in this lab, determine the concentration value that would be obtained for the acid by the technician. Show your work.

4.What is the difference between the values obtained for the concentration when using the end point (Question #2) and the equivalence point? Express this difference as a percent error .

5. Copies of Notebook Pages Submit the copies of the notebook pages recorded for this lab. Make sure that the notebook pages meet the criteria provided by the instructor.

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Criteria Points

Not Present 0

Less Than Satisfactory 3

Name:

Clarissa Verduzco

Section:

M1230

Date:

10/25/20

Satisfactory

Proficient

Exemplary

4

5

6 Problem identified focuses on the student controllable parameters including, but not limited to: better preparation, reading the background material, visualizing the process etc. Identified reasons are clear and focused.

Satisfactory

Problem identified focuses on controllable parameters including some of those in the Exemplary column, but the student does not take complete responsibility. Proficient

3

4

5

6

Plan does not identify the overall goal of being able to complete the work in class. Student provides one or two tasks that could be done to improve work.

Plan identifies the overall goal of being able to complete the work in class. Student provides a set of tasks that need to be done to attain the identified goal.

Plan identifies the overall goal of being able to complete the work in class. Student provides a set of tasks that need to be done to attain the identified goal. A plan that brings the goals and tasks into an organized summary is presented.

Plan identifies the overall goal of being able to complete the work in class. Student provides a thorough set of tasks that need to be done to attain the identified goal. A plan that brings the goals and tasks into an organized summary is presented.

Statements that provide no details or no statement at all.

Problem is identified but student blames others for the problem and takes no responsibility.

Problem identified is somewhat focused on controllable parameters including some of those in the Exemplary column, but the student does not take complete responsibility.

Criteria

Not Present

Less Than Satisfactory

Points

0 No implement ation plan

Explanation

Implementa tion Plan

Rubrics for Activity 2(c)

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Exemplary...