27 Acid Dissociation Ka - Experiment Acid Dissociation...

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Chemistry with Computers 27 - 1 Experiment 27 Acid Dissociation Constant, K a Acetic Acid, HC 2 H 3 O 2 , is a weak acid that dissociates according to this equation: HC 2 H 3 O 2 (aq)  → H + (aq) + C 2 H 3 O 2 (aq) In this experiment, you will experimentally determine the dissociation constant, K a , for acetic acid, starting with solutions of different initial concentrations. In the second part you will be investigating the Ka for another weak acid, NH 4 + , ammonium ion. OBJECTIVES In this experiment, you will Gain experience mixing solutions of specified concentration. Experimentally determine the dissociation constant, K a , of an acid. Investigate the effect of initial solution concentration on the equilibrium constant. MATERIALS computer wash bottle Vernier computer interface distilled water Logger Pro 100 mL volumetric flask Vernier pH Sensor Pipets 100 mL beaker pipet bulb 2.00 M HC 2 H 3 O 2 2.00 M NH 4 Cl PRE-LAB 1. Write the equilibrium constant expression, K a , for the dissociation of acetic acid, HC
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This lab report was uploaded on 04/19/2008 for the course CHEMISTRY 142L taught by Professor Lab during the Spring '08 term at Bridgewater State University.

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27 Acid Dissociation Ka - Experiment Acid Dissociation...

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