Acid-Base Buffer lab

Acid-Base Buffer lab - Joshua Oliver 3/31/09 Kate Olaughlin...

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Joshua Oliver           Date Preformed:  3/31/09 Kate Olaughlin           Date Due: 4/7/09 Acid-Base Buffers 1. Objective: To determine the ionization constant of acetic acid. To study the properties  of acid-base buffers 2. Experimental Data Part A Solution pH values A 2.57 B 2.82 C 2.96 D 3.05 E 2.73 Part B Solution pH A0 4.45 A1 1.27 A2 12.05 B0 4.71 B1 1.55 B2 12.16 C0 6.90 C1 1.63 C2 12.02 3. Sample Calculations 1) molarity of each acetic solutions in part A: m1V1=m2V2 Solution A: (25.0mL)(1.00M)=(50.0mL)(M2) M2= 0.500 Solution B: (10.0mL)(1.00M)=(50.0mL)(M2) M2= 0.200 Solution C: (5.0mL)(1.00M)=(50.0mL)(M2) M2= 0.100 Solution D: (25mL)(1.00M)=(50mL)(M2) M2= 0.500 Solution E: (5.0mL)(0.20M)=(50mL)(M2) M2=0.050 2) the [H + ]: [H + ]=10 -pH a.10 -2.57 = 0.0027 for part A b.10 -4.45 = 3.55×10 -5  for part B 3) Ka in Part A: Ka=[H + ][C 2 H 3 O 2 - ]/[HC2H3O2]=[x][x]/[M-x] a.[0.0027][0.0027]÷[0.500-0.0027]=1.47×10
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This note was uploaded on 06/19/2009 for the course CHEM 1045 taught by Professor Pgamateis during the Fall '08 term at Virginia Tech.

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Acid-Base Buffer lab - Joshua Oliver 3/31/09 Kate Olaughlin...

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