Lab #5 - 10-11

Lab #5 - 10-11 - Elisa Giordano Due Lab#5 Determining the...

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Elisa Giordano Due: 10/18/06 Lab #5 Determining the Dissociation Constant of a Weak Acid Using pH Meaures INTRODUCTION The main purpose of this laboratory exercise is to find the dissociation constant, K a , for a weak acid. This is done by using pH measurements. An acidic substance is one that donates a hydrogen ion to an accepting substance, which is called the base. Substances can be classified as being strong or weak by determining the extent to which they dissociate, or dissolve, in water. Ultimately, strong acids completely dissociate in water, while weak acids dissociate on a lesser level. EXPERIMENTAL PROCEDURES *See Lab Notebook* -Used 50-mL volumetric flasks instead of 250-mL volumetric flasks -Used 8-mL of 1.00 M unknown weak acid solution for solution numbers 1, 2, 3, and 4 respectively -Used 2.5-mL, 5.0-mL, 7.5-mL, and 10.0-mL of 0.500 M sodium hydroxide solution for solution numbers 1, 2, 3, and 4 respectively DATA TABLE Molarity of unknown acid 1.00 M Molarity of NaOH Solution 0.500M 1 2 3 4 Volume of unknown acid 8 mL 8 mL 8 mL 8 mL Volume of NaOH solution 2.5 mL 5.0 mL 7.5 mL 10.0 mL Total Volume of Solution 50 mL 50 mL 50 mL 50 mL pH
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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 #5 - 10-11 - Elisa Giordano Due Lab#5 Determining the...

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