Titration of a Diprotic Acid

Titration of a Diprotic Acid - Titration of a Diprotic Acid...

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Titration of a Diprotic Acid: Identifying an Unknown I. Purpose: The purpose of this lab is to identify an unknown diprotic acid by finding its molecular weight. II. Procedure : Weigh out 0.120 g of the unknown diprotic acid and record its mass to the nearest thousandth of a gram. Fill a 250 mL beaker with 100 mL of distilled water, and put the unknown acid into the beaker to be dissolved. Next, add a stirring bar and place the beaker on the magnetic stirrer. Suspend a pH sensor, on a ring stand, in the diprotic acid solution. Turn the stirrer on to medium. In a 250 mL beaker obtain 60 mL of 0.1 M NaOH solution. Next rinse a 50 mL buret with the 0.1 M NaOH, and record this concentration in the data table. Suspend the buret on the ring stand so it’s over the beaker. Fill the buret above the 0.00 mL mark with 0.1 M NaOH. Level and drain the buret to 0.00 mL. Now connect the pH sensor to the computer and open the file “25a Titration Dip Acid.” This file can be found in the Chemistry with Computers folder in the program Logger Pro. Before adding the NaOH click the COLLECT button and monitor the pH for about five seconds to make sure it stabilizes. Once it’s stable, click the KEEP button, and type “0” in the edit box and press ENTER. Now add NaOH until the pH goes up by 0.20 and wait for the pH to stabilize. Once stabilized, click the KEEP button. Next, type the current buret
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This note was uploaded on 05/25/2010 for the course CHEM 101 taught by Professor Fricke during the Spring '10 term at Canisius College.

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Titration of a Diprotic Acid - Titration of a Diprotic Acid...

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