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Acid Dissociation Constant, Ka Chem Lab

Acid Dissociation Constant, Ka Chem Lab - Brittany Yee...

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Brittany Yee 3/1/08 Period 4-5 Chemistry Lab # Title: Acid Dissociation Constant, Ka Purpose: To gain experience mixing solutions of specified concentration. Experimentally determine the dissociation constant, Ka, of an acid.Investigate the effect of initial solution concentration on the equilibrium constant. Materials: 100-mL beakers (3) .5 M HC2H3O2 Distilled Water 100-mL volumetric flask Pipets (2) Pipet bulbs (2) .3 M acetic acid Procedure: 1. Obtain and wear safety goggles. 2. Put approximately 50 mL of distilled water into a 100-mL volumetric flask. 3. Use a pipet bulb to pipet the required volume of 2.00 M acetic acid into volumetric flask. Fill the flask with distilled water to the 100-mL mark. To prevent overshooting the mark, use a wash bottle filled with distilled water for the last few mL. Mix thoroughly. 4. Use the pH sensor to determine the pH of the solution as follows: a. Use about 40 mL of distilled water in a 100-mL beaker to rinse the pH Sensor.
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