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Exp. 5 - Course Chem 221 Name Ashay Mehta Experiment#5...

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Course: Chem 221 Name: Ashay Mehta Experiment #5 – Potentiometric Titration of an Acid Mixture Unknown Number: #507 Due Date: 10/30/09 Date Report Submitted: 10/30/09 Grade: Accuracy Presentation Total
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Potentiometric Titration of an Acid Mixture Ashay Mehta October 29 th , 2009 Objective: To successfully obtain a titration curve with a pH meter and to determine the concentration of an acid mixture. Theory: A mixture of two acids is titrated with a standard base. In this titration, the pH does not change with sufficient abruptness at the equivalence point to allow a sharp color change in an indicator. The pH meter is used to measure the pH near the equivalence point. The concentrations of acids can be determined when the pK’s are different. The measurement of pH involves the measurement of the potential between two electrodes, a glass electrode that responds to H + and a reference electrode which is often a standard calomel electrode (SCE). Procedure: First, I made 300 mL of 0.2 M NaOH solution. After that, I weighed out 0.5 grams of sulfamic acid into a 250 mL beaker and added 50 mL of distilled water. Then, I calibrated the pH electrode and kept it in the solution while titrating with NaOH. I added 1 mL at a time till it started to jump. Then, I added 0.1 mL until it dropped again. I plotted all of this in my notebook. Then I repeated the procedure. After that, I got an unknown sample and weighed out 0.5 grams of it. I put it into a 250 mL beaker and added 50 mL of distilled water. Then I titrated with the NaOH solution just as I did with the sulfamic acid. Finally, I ran a duplicate titration.
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