Experiment 5 Discussion Strong Acid - Base titration

Experiment 5 Discussion Strong Acid - Base titration - 7....

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Experiment 5: Titration – Strong Acid and Strong Base Discussion Questions Each question in part I and part II has a 5-point value for a total of 50 points for this written discussion. Part I 1. What were the objectives of the experiment? 2. What were your primary standard and your secondary standard in part I, what is the difference between the two types of standards? Why was it necessary to standardize the NaOH solution? 3. Briefly describe the processes used to determine the molar concentration of your NaOH. What is the difference between an end point and an equivalence point? 4. Were the calculated molarities of your NaOH solutions from the indicator method and Gran plot method within a reasonable range (about 5%) of each other? If not, suggest reasons for the inaccuracy. 5. Compare the actual molarity of your determined NaOH solution with your goal of 0.500M. Which method did you use to determine your actual molar concentration of the NaOH solution? Why? Part II 6. What were the objectives of the experiment?
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Unformatted text preview: 7. Briefly describe the processes used to determine the molarity of your unknown acid. 8. Were the calculated molarities of your HCl solutions from the indicator method, titration curve and Gran plot method within a reasonable range (about 5%) of each other? 9. What was the concentration of your unknown acid? Which of the methods that you used to calculate the molarity of your unknown acid concentration did you determine to have the most accurate results? Why? 10. Using the indicator phenolphthalein in an acid-base titration is a common method of determining unknown concentrations of acids in general chemistry laboratories. Based on the observations you made during the titration with phenolphthalein and considering the results you obtained from the indicator and the results you obtained with the pH meter, either defend or oppose the use of the indicator as an effective method of determining the concentrations of acid solutions....
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This note was uploaded on 03/19/2011 for the course CH 204 taught by Professor Leytner during the Spring '08 term at University of Texas at Austin.

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