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In lab 9, students performed acid-base titrations. redox reactions

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In Lab 9, students performed acid-base titrations. Redox reactions can also be used in titrations. An example is the titration of ascorbic acid (H2C6H6O6) in lemon juice using triiodide (I3–http://www.webassign.net/images/thinsp.gif). A starch indicator will turn the solution blue-black at the endpoint. The half-reactions involved are shown below.

C6H6O6 + 2 H+ + 2 e–

 → 

H2C6H6O6

    +0.06 V

I3– + 2 e–

 → 

3 I–

    +0.53 V

 

(a) What is the net redox reaction that occurs? (Use the lowest possible coefficients. Omit states-of-matter from your answer.)

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[removed]

 

(b) What is the stoichiometry of H2C6H6O6 to I3–?

[removed]3:1 [removed]8:3     [removed]2:1 [removed]1:1 [removed]1:2 [removed]3:8 [removed]1:3

(c) Use the data given below to determine the amount of ascorbic acid in lemon juice. (Note: The recommended daily allowance of ascorbic acid (Vitamin C) is 90 mg.)

Data Table P6: Titration of ascorbic acid in lemon juice with triiodide

concentration of I3–

0.0210 M

  

volume lemon juice

83.44 mL

  

mass lemon juice

84.94 g

  

equivalence volume of I3–

14.93 mL

  

mmol of I3–

WebAssign will check your answer for the correct number of significant figures.[removed]mmol

  

mmol of H2C6H6O6

WebAssign will check your answer for the correct number of significant figures.[removed]mmol

  

mass of H2C6H6O6

WebAssign will check your answer for the correct number of significant figures.[removed]mg   

           

 

Determine the errors (if any) with each galvanic cell set-up when the anode is on the left. (Select all that apply.)

http://www.webassign.net/ncsugenchem102labv1/11-post-05a.png

 

[removed]There is nothing wrong with this diagram. [removed]The electrodes are in the wrong solution. [removed]The electrons are traveling the wrong direction down the wire. [removed]The salt bridge ions are migrating to the incorrect electrode. [removed]The electrons are traveling through the salt bridge. [removed]The electrodes and solutions are in the wrong compartment.

 

http://www.webassign.net/ncsugenchem102labv1/11-post-05d.png

 

[removed]There is nothing wrong with this diagram. [removed]The electrodes are in the wrong solution. [removed]The electrons are traveling the wrong direction down the wire. [removed]The salt bridge ions are migrating to the incorrect electrode. [removed]The electrons are traveling through the salt bridge. [removed]The electrodes and solutions are in the wrong compartment.

 

http://www.webassign.net/ncsugenchem102labv1/11-post-05b.png

 

[removed]There is nothing wrong with this diagram. [removed]The electrodes are in the wrong solution. [removed]The electrons are traveling the wrong direction down the wire. [removed]The salt bridge ions are migrating to the incorrect electrode. [removed]The electrons are traveling through the salt bridge. [removed]The electrodes and solutions are in the wrong compartment.

 

http://www.webassign.net/ncsugenchem102labv1/11-post-05e.png

 

[removed]There is nothing wrong with this diagram. [removed]The electrodes are in the wrong solution. [removed]The electrons are traveling the wrong direction down the wire. [removed]The salt bridge ions are migrating to the incorrect electrode. [removed]The electrons are traveling through the salt bridge. [removed]The electrodes and solutions are in the wrong compartment.

 

http://www.webassign.net/ncsugenchem102labv1/11-post-05c.png

 

[removed]There is nothing wrong with this diagram. [removed]The electrodes are in the wrong solution. [removed]The electrons are traveling the wrong direction down the wire. [removed]The salt bridge ions are migrating to the incorrect electrode. [removed]The electrons are traveling through the salt bridge. [removed]The electrodes and solutions are in the wrong compartment.

Consider your experimental results from part A of this lab. Suppose your strongest reducing agent were added to your strongest oxidizing agent. (Use the lowest possible coefficients. Omit states-of-matter from your answers.)

(a) Write the half-reaction for your strongest reducing agent.

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Mg  →  Mg2+ + 2e1-

[removed]

Correct.

(b) Write the half-reaction for your strongest oxidizing agent.

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MnO4– + 8H+ + 5e–  →  Mn2+ +4H2O

[removed]

Correct.

(c) Note the number of electrons in each half reaction.

In order to balance the number of electrons lost and gained, the oxidation half-reaction must be multiplied by and the reduction half-reaction must be multiplied by

(d) Write the net redox reaction.

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 Assemble a battery, represented by the diagram below with the cathode in compartment A, with Sn2+/Sn and Cu2+/Cu couples in which the voltage reads positive. (Use the . Use the lowest possible coefficients. Omit states-of-matter from your answer.)

http://www.webassign.net/ncsugenchem102labv1/11-post-04.gif

 

(a) What half-reaction occurs in compartment A?

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Sn  →  Sn2+ +2e–

[removed]

Your answer contains an ambiguous or incomplete reaction equation. Check all the components on the reactant-side of the equation. Check all the components on the product-side of the equation.

(b) What half-reaction occurs in compartment B?

chemPad

Help

Cu2+ +2e–  →  Cu

[removed]

Your answer contains an ambiguous or incomplete reaction equation. Check all the components on the reactant-side of the equation. Check all the components on the product-side of the equation.

(c) Write the net redox reaction.

chemPad

Help

Sn + Cu2+  →  Sn2+ + Cu

[removed]

Correct.

 

[removed]

 

 

 

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July 1, 2023
    

 

Use the Internet and / or the Strayer Learning Resource Center to research aspects of biology.

Select an article from a magazine or newspaper that has something in it that pertains to biology. This will serve as the “target article” for this assignment. For instance, you can select an article about medicine, invasive species, nature, conservation, genetic technology, ecology, or any other topic that is related to biology. One purpose of this assignment is to help you become aware of how biology is related to your everyday life.

Write a one to three (1-3) page paper in which you:

  1. Summarize the article in one (1) or more paragraphs, using your own words. Be sure to identify the article using an in-text citation in the body of the paper, as well as a reference in the reference section. 
  2. Explain how the article relates to this course. Identify which biological concepts from the course and / or text are relevant to the topic covered in the article. Citing the course text, discuss the ways in which this course does (or doesn’t) provide background information to help you understand the article and the larger issues surrounding it. 
  3. Explain why the article caught your attention. Relate the article to your life and to issues that are important to you. Discuss how or if the scientific knowledge about the topic covered in the article affects you directly or indirectly.
  4. Discuss your opinion on how research on this topic should be funded. State whether you think taxpayer monies should support research on this topic or whether such research in this area should be funded by the private sector. Rate the importance of research on this topic, relative to other areas of research. 

In addition to the target article, you should use at least one additional resource, such as your textbook or another article. You must have a reference section which contains an APA reference to your chosen article and all other sources. Additionally, you must provide in-text citations (in APA format) to your references in the body of the text. Integrate all sources into your paper using proper techniques of quoting, paraphrasing and summarizing, along with your in-text citations.

Your assignment must follow these formatting requirements:

  • Be typed, double spaced, using Times New Roman font (size 12), with one-inch margins on all sides; citations and references must follow APA or school-specific format. Check with your professor for any additional instructions.
  • Include a cover page containing the title of the assignment, the student’s name, the professor’s name, the course title, and the date. The cover page and the reference page are not included in the required assignment page length.

The specific course learning outcomes associated with this assignment are:

  • Use technology and information resources to research issues in biology.
  • Write clearly and concisely about biology using proper writing mechanics.

Grading for this assignment will be based on answer quality, logic / organization of the paper, and language and writing skills. 

Click to view the grading rubric.

*This is the topic i am using* https://www.sciencedaily.com/releases/2018/01/180118084554.htm

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July 1, 2023
    

 

Use the Internet and / or the Strayer Learning Resource Center to research aspects of biology.

Select an article from a magazine or newspaper that has something in it that pertains to biology. This will serve as the “target article” for this assignment. For instance, you can select an article about medicine, invasive species, nature, conservation, genetic technology, ecology, or any other topic that is related to biology. One purpose of this assignment is to help you become aware of how biology is related to your everyday life.

Write a one to three (1-3) page paper in which you:

  1. Summarize the article in one (1) or more paragraphs, using your own words. Be sure to identify the article using an in-text citation in the body of the paper, as well as a reference in the reference section. 
  2. Explain how the article relates to this course. Identify which biological concepts from the course and / or text are relevant to the topic covered in the article. Citing the course text, discuss the ways in which this course does (or doesn’t) provide background information to help you understand the article and the larger issues surrounding it. 
  3. Explain why the article caught your attention. Relate the article to your life and to issues that are important to you. Discuss how or if the scientific knowledge about the topic covered in the article affects you directly or indirectly.
  4. Discuss your opinion on how research on this topic should be funded. State whether you think taxpayer monies should support research on this topic or whether such research in this area should be funded by the private sector. Rate the importance of research on this topic, relative to other areas of research. 

In addition to the target article, you should use at least one additional resource, such as your textbook or another article. You must have a reference section which contains an APA reference to your chosen article and all other sources. Additionally, you must provide in-text citations (in APA format) to your references in the body of the text. Integrate all sources into your paper using proper techniques of quoting, paraphrasing and summarizing, along with your in-text citations.

Your assignment must follow these formatting requirements:

  • Be typed, double spaced, using Times New Roman font (size 12), with one-inch margins on all sides; citations and references must follow APA or school-specific format. Check with your professor for any additional instructions.
  • Include a cover page containing the title of the assignment, the student’s name, the professor’s name, the course title, and the date. The cover page and the reference page are not included in the required assignment page length.

The specific course learning outcomes associated with this assignment are:

  • Use technology and information resources to research issues in biology.
  • Write clearly and concisely about biology using proper writing mechanics.

Grading for this assignment will be based on answer quality, logic / organization of the paper, and language and writing skills. 

Click to view the grading rubric.

*This is the topic i am using* https://www.sciencedaily.com/releases/2018/01/180118084554.htm

default image
July 1, 2023
    

 

Use the Internet and / or the Strayer Learning Resource Center to research aspects of biology.

Select an article from a magazine or newspaper that has something in it that pertains to biology. This will serve as the “target article” for this assignment. For instance, you can select an article about medicine, invasive species, nature, conservation, genetic technology, ecology, or any other topic that is related to biology. One purpose of this assignment is to help you become aware of how biology is related to your everyday life.

Write a one to three (1-3) page paper in which you:

  1. Summarize the article in one (1) or more paragraphs, using your own words. Be sure to identify the article using an in-text citation in the body of the paper, as well as a reference in the reference section. 
  2. Explain how the article relates to this course. Identify which biological concepts from the course and / or text are relevant to the topic covered in the article. Citing the course text, discuss the ways in which this course does (or doesn’t) provide background information to help you understand the article and the larger issues surrounding it. 
  3. Explain why the article caught your attention. Relate the article to your life and to issues that are important to you. Discuss how or if the scientific knowledge about the topic covered in the article affects you directly or indirectly.
  4. Discuss your opinion on how research on this topic should be funded. State whether you think taxpayer monies should support research on this topic or whether such research in this area should be funded by the private sector. Rate the importance of research on this topic, relative to other areas of research. 

In addition to the target article, you should use at least one additional resource, such as your textbook or another article. You must have a reference section which contains an APA reference to your chosen article and all other sources. Additionally, you must provide in-text citations (in APA format) to your references in the body of the text. Integrate all sources into your paper using proper techniques of quoting, paraphrasing and summarizing, along with your in-text citations.

Your assignment must follow these formatting requirements:

  • Be typed, double spaced, using Times New Roman font (size 12), with one-inch margins on all sides; citations and references must follow APA or school-specific format. Check with your professor for any additional instructions.
  • Include a cover page containing the title of the assignment, the student’s name, the professor’s name, the course title, and the date. The cover page and the reference page are not included in the required assignment page length.

The specific course learning outcomes associated with this assignment are:

  • Use technology and information resources to research issues in biology.
  • Write clearly and concisely about biology using proper writing mechanics.

Grading for this assignment will be based on answer quality, logic / organization of the paper, and language and writing skills. 

Click to view the grading rubric.

*This is the topic i am using* https://www.sciencedaily.com/releases/2018/01/180118084554.htm

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