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CHE 111L Lecture Notes - Lecture 7: Equivalence Point, Acid Dissociation Constant

The purpose of this experiment was to determine the pka of a weak monoprotic acid. The procedure for this experiment can be found on pages 50-52 in general chemistry. Carbon copies of the data table have been attached to the back of this lab report. The purpose of this lab, to determine the pka of a weak monoprotic acid, was fulfilled. The unknown number was found to be 4. The equivalence point volume was found to be 9. 84 by interpolation on the graph comparing ph and volume. The half equivalence point volume was found to be 4. 92 by interpolation on the graph comparing ph and volume. The pka is equal to the half equivalence point volume and was found to be 4. 92. Possible sources of error for this lab included calibration errors, the calculating of the equivalence point, and the stability of the ph electrode.

United States

(UC) General Chemistry II Lab

Chemistry

David Stilwell

Quinnipiac University

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<div style="font-family:'Helvetica Neue', Helvetica, Arial;color:#333333;"> <div> <br> <picture><source srcset="https://prealliance-textbook-qa.oneclass.com/qa_images/homework_help/question/qa_images/130/13030678.jpeg" type="image/webp"></source><img src="https://prealliance-textbook-qa.oneclass.com/qa_images/homework_help/question/qa_images/130/13030678.jpeg" alt=""></picture> </div> </div> <div id="c2t" class="hidden">0 Late Submission until Mar 7 at 8 AM CST is all ed, with a cretime 10% penalty to submitted score. CST U'se the References to access important values if needed for this questinn What is the pll of a 3.7 108 molar aqueous perchloric acid solution? (Hint: The H,0' due to the water ionization is not negligible here,) Submil Answer 4 question attempts remaining Autosaved at 10.20 PM 9 4 WE R </div>

<div style="font-family:'Helvetica Neue', Helvetica, Arial;color:#333333;"> <br> <br> </div> <div> <br> <picture><source srcset="https://prealliance-textbook-qa.oneclass.com/qa_images/homework_help/question/qa_images/112/11274259.jpeg" type="image/webp"></source><img src="https://prealliance-textbook-qa.oneclass.com/qa_images/homework_help/question/qa_images/112/11274259.jpeg" alt=""></picture> </div> <div id="cf1" class="hidden">NAME: LAB TEAM MEMBERS: SECTION: DATE TA: Le Chatelier's Principle: Chemical Equilibrium and Determination of Equilibrium Constant POST-LABORATORY QUESTION 1. For the following reaction: yellow orange a. Use Le Chatelier's Principle to account for the effect of adding H,SO, to a solution of K,CrO, (1.5 pts) b. Use Le Chatelier's Principle to account for the effect of adding when NaOH to the mixture in question la. (1.5 pts) 2. For the following reaction: </div>

<div style="font-family:'Helvetica Neue', Helvetica, Arial;color:#333333;"> <div> <br> <picture><source srcset="https://prealliance-textbook-qa.oneclass.com/qa_images/homework_help/question/qa_images/115/11599200.jpeg" type="image/webp"></source><img src="https://prealliance-textbook-qa.oneclass.com/qa_images/homework_help/question/qa_images/115/11599200.jpeg" alt=""></picture> 1,2,3,4</div> </div> <div id="ipn" class="hidden">Calculate the pH and percentage ionization of a 0.0500 M acetic acid (CH_3COOH) solution? Caffeine (C_8H_10N_4O_2) is a weak base with a Kb of 4.10 times 10^-4. Calculate the pH and % ionization of a solution containing a caffeine concentration of 455 mg/mL. A 0.0115 M solution of a weak acid has a pH of 3 29. Calculate the acid ionization constant (Ka) for the acid. A 0.085 M solution of monoprotic acid has a percent ionization of 0.59%. Determine the acid ionization constant (Ka) for the acid. A 0.150M solution of a weak base morphine has a pH of 10.5. What is the Kb of morphine?</div>

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