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------------PLEASE DELETE THIS SECTION OF THE WORKSHEET BEFORE SUBMITTING------------ For the laboratory assignments, you can access the videos online when you go to www.thinkwell.com. Simply log in at the top with the login information provided from the university (CONTACT THE BOOKSTORE ASAP IF YOU DID NOT RECEIVE IT). It will then take you to a table of contents page, then use the number selection given in the syllabus and course announcement to select the lab you want to view. You should see a link to the video, and you can also access notes and a transcript of the lab. See the Syllabus for more information regarding formatting AND how your assignment will be graded. Submit your completed assignments as a “Word” file to the proper area in the classroom. Please put your name on all assignments. ***You must submit your assignments as either Microsoft Word documents (.doc or .docx), or else as Rich Text Format (.rtf). *** You will not receive credit for your work if you submit in any other format, i.e., WordPerfect, Word Pad, Works, etc. REVIEW THE SYLLABUS REGARDING HOW YOU MUST FORMAT YOUR ANSWERS TO THIS ASSIGNMENT! YOUR ASSIGNMENT SUBMISSION IS REQUIRED TO BE SETUP A CERTAIN WAY. ----------------------------------------------------- DELETE ---------------------------------------------------- Student Name: Student ID: Date: Course and Section Number: Lesson 6 Lab: Titrations and Natural Acid/Base Indicators Begin by viewing the following Thinkwell videos 27.1.6 CIA Demonstration: Titrations 16.2.2 CIA Demonstration: Natural Acid-Base Indicators (NOTE: The second video is sort of a supplement to the first, and shows how this applies to your daily life. Feel free to try some of the things listed in the video, but be sure to report back to the class regarding the results of your experiments!) After you watch the above video, answer the questions below in sufficient detail:
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(a) (1 pts.) In YOUR OWN WORDS, what is a titration? What type of reaction is it? Answer: (b) (1 pts.) What is the BALANCED chemical reaction for the titration performed in this lab demonstration? What does this balanced equation tell us that is so important with respect to this particular lab exercise, and how do you use this information in this lab? Answer: (c) (1 pts.) What is the name of the special piece of glassware used in this titration exercise? Why use it as opposed to, say, a graduated pipette--what is special about the glassware used here? How is it SPECIFICALLY used in this lab? Answer: (d) (2 pts.) In a titration, assuming it is carried out just like the one in this lab exercise, how do you determine the number of moles of base used? Explain in detail, showing all work. Answer: (e) (2 pts.) In a titration, assuming it is carried out just like the one in this lab exercise, how do you determine the number of moles of acid used? How do you then use this information to determine the concentration of the acid? Explain in detail, showing all work. Answer: (f) (1 pts.) In this titration example, how do you know when the reaction is complete? What is used (be specific), and how does it work? What is the official name (Dr. Yee mentions this) of the end of this reaction? Answer: (g) (2 pts.) How does the hydrogen ion (H+) [or the hydronium ion (H3O+)] and the hydroxide ion (OH-) fit into all of this? What is their role in this reaction? In the case of this particular example that you watched, where would each of these ions have come from? Answer: (h) (2 pts.) Suppose I wanted to calculate the pH of the acid used in this titration. How (explain) can I use the results from this experiment to do this? What would the pH be in this case? Show all work.
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