Lab #6 - 10-18

Lab #6 - 10-18 - Elisa Giordano Due: October 25, 2006 Lab...

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Elisa Giordano Due: October 25, 2006 Lab #6 Studying the pH of Strong Acid, Weak Acid, Salt, and Buffer Solutions INTRODUCTION The purpose of this lab was to measure the pH of solutions of hydrochloric acid, HCl, and acetic acid, HC 2 H 3 O 2 , and then calculate the dissociation constant for acids using those pH’s. The pH’s of salt solutions were also measured and the hydrolysis constant for ammonium chloride was found. This lab is an aid to understanding how to calculate the pH of various solutions as well as calculating the constants. EXPERIMENTAL PROCEDURES *See Lab Manual* DATA TABLES I. Preparing HCl Solutions and Determining pH Concentration of HCl, M Measured pH Theoretical pH 0.96 x 10 -1 M 1.2 1.018 0.96 x 10 -2 M 2.8 2.018 0.96 x 10 -3 M 4.7 3.018 0.96 x 10 -4 M 6.3 4.018 III. Preparing HC 2 H 3 O 2 Solutions and Determining pH Concentration of HC 2 H 3 O 2 , M Measured pH Theoretical pH 1.0 x 10 -1 M 2.7 2.87 1.0 x 10 -2 M 3.3 3.37 1.0 x 10 -3 M 3.7 3.87 1.0 x 10 -4 M 4.3 4.37 Concentration of HC 2 H 3 O 2 , M Calculated K a of HC 2 H 3 O 2 based on pH data Literature K a of HC 2 H 3 O 2 1.0 x 10 -1 M 3.98 x 10 -5 1.8 x 10 -5 1.0 x 10 -2 M 2.5 x 10 -5 1.8 x 10 -5 1.0 x 10 -3 M 3.98 x 10 -5 1.8 x 10
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This note was uploaded on 05/04/2008 for the course CHM 114 taught by Professor Geldhart during the Fall '08 term at Rhode Island.

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Lab #6 - 10-18 - Elisa Giordano Due: October 25, 2006 Lab...

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