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Acid-Base Buffer lab - Joshua Oliver Kate Olaughlin Date...

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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 -5 4) Ka in Part B: Ka=[H + ][C 2 H 3 O 2 - ]/[HC2H3O2]=[H + ][NaOAc]/[HOAc] a.[3.55 × 10 -5 ][0.4] ÷ [0.4]=3.55 × 10 -5 5) average and standard deviation in the Ka values in part A: ±   Average Ka: (A+B+C+D+E)/ 5= 6.05
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