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acid base buffers

# acid base buffers - Date Performed Date Submitted...

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Date Performed: 3/22/06 Name: Ronald Lampkins Date Submitted: 3/29/06 Partner: Jason Herrala Instructor: Shengliang Zhao ACID-BASE BUFFERS Objectives: To determine the ionization constant of acetic acid. To study the properties of acid-base buffers. Experimental Data: Part A Buffer solution pH: 7.35 Solution Made By Mixing M of Acetic Acid Measured pH A Nothing, take from bottle 1.00 2.42 B 25 mL solution A + 25 mL water 0.50 2.54 C 10 mL solution A + 40 mL water 0.20 2.68 D 5 mL solution A + 45 mL water 0.10 2.72 E 5 mL solution B + 45 mL water 0.05 2.94 Part B Solution pH A 0 4.66 A 1 3.15 A 2 5.62 B 0 4.70 B 1 1.67 B 2 12.30 C 0 5.03 C 1 1.39 C 2 12.54 Sample Calculations: Molarity of solution B: M 1 V 1 = M 2 V 2 (1.0 M acetic acid)(25 mL) = (x)(50mL total) 25 = 50x X = 0.5 M acetic acid H + Concentration solution A 10 ^pH 10 ^-2.42 = 3.8 x 10 -3 M

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K a Value of solution A K a = [products] / [reactants] K a = [H + ][C 2 H 3 O 2 - ] / [HC 2 H 3 O 2 ] K a = [x] 2 / [M – x] K a = [3.8 x 10 -3 ] 2 / [1.0 – 3.8 x 10 -3 ] K a = 1.45 x 10 -5 Results and conclusions: Part A Solution Molarity of Solution Measured pH K a Values A 1.00 2.42 1.45 x 10 -5 B 0.50 2.54 1.67 x 10 -5 C 0.25 2.68 1.76 x 10 -5 D 0.10 2.72
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acid base buffers - Date Performed Date Submitted...

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