Lab 9 - Zachary Kmieciak Mr. Songpo Chemistry 112 8 AM 4...

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Zachary Kmieciak Mr. Songpo Chemistry 112 – 8 AM 4 December 2006 Introduction The purpose of this experiment is to get an understanding of how buffers work, especially when looking to stabilize the pH of a solution. Procedure Calibration of pH Meter 1. Obtain about 15 mL of standardization solution in a clean dry beaker. 2. Plug in your pH meter and allow it to warm up for at least three minutes. 3. Rinse the tip of the meter with deionized water. 4. Place the probe in the standardized solution. 5. Adjust meter to the correct value of pH. Addition of Strong Acid and Base to Standard Buffer 1. Obtain two burets. 2. Pre-rinse one buret with a solution of the standard strong acid and the other with strong base. 3. 25 mL of buffer and five drops of bromocresol green in a beaker. 4. Place pH probe into the solution. 5. Add the strong acid in approximately .5 mL increments. 6. Record the pH and level in the buret after each increment. 7. Continue until the pH drops below 2.00
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This note was uploaded on 04/02/2009 for the course CHEM 112 taught by Professor Jursich during the Spring '08 term at Ill. Chicago.

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Lab 9 - Zachary Kmieciak Mr. Songpo Chemistry 112 8 AM 4...

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