lab 18 Acid Base Buffers

# lab 18 Acid Base Buffers - Date Performed Date Submitted...

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Date Performed: 03/24/08 Name: Dustin Rinehart Date Submitted: 03/31/08 Partner: Sarah Votsi Instructor: Furong Sun Acid-Base Buffer Objective To determine the ionization constant of acetic acid To study the properties of acid-base buffers Experimental Data solution made by mixing M of Acetic Acid pH A nothing, take from bottle 1 2.56 B 25.0 mL solution A + 25.0 mL water 0.5 2.66 C 10.0 mL solution A + 40.0 mL water 0.2 2.92 D 5.0 mL solution A + 45.0 mL water 0.1 3.08 E 5.0 mL solution B + 45.0 mL water 0.05 3.09 Original pH= 6.88 (based to be 7.00 and therefore neutral) A) solution additives pH A0 none 4.36 A1 4 drops of 6M HCl 2.05 A2 4 drops of 6M NaOH 4.9 B0 none 4.35 B1 4 drops of 6M HCl 1.32 B2 4 drops of 6M NaOH 5.65 B)

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deionized water solution additives pH C0 none 4.44 C1 4 drops of 6M HCl 0.94 C2 4 drops of 6M NaOH 12.84 Sample Calculations A) HC2H3O2 3 H + + C2H3O2 - I 1.00M 0 0 C -x +x +x E 1.00-x x x pH= 2.56 so, [H + ]= 10^-2.56 = .00275M so, x= .00275 Ka= [H + ][C2H3O2-] >> [x]
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lab 18 Acid Base Buffers - Date Performed Date Submitted...

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