Data Table 2. Titration Curve values. Drops NaOH Added pH Value Trial 2 Half-Equ
ID: 572513 • Letter: D
Question
Data Table 2. Titration Curve values. Drops NaOH Added pH Value Trial 2 Half-Equivalent Point = (60 Drops) Equivalent Point = (119 Drops) pH Value Trial 1 4.5 13 1.5 14 1.5 2.5 pH Value (Average) 4.75 13.5 1.5 2.5 3.75 2.5 10 20 30 40 50 3.5 3.5 3.5 4.5 4.5 4.5 4.5 4 4.5 4.75 4.5 5 5 5 6 60 70 80 90 100 110 120 5.5 5.5 7 6.5 12 13 13.5 14 12.75 13.5 Data Table 3. Determination of Unknown. pKa of Unknown Weak Acid: 4.75 Ka of Unknown Weak Acid: Unknown Weak Acid Identity: % Error pKa: % Error ka:Explanation / Answer
ka = 10-4.75 = 1.78 x 10-5
unknown weak acidity = acetic acid
% error pka = (experimental - theoretical)/ theoretical x 100 = (4.75 - 4.75)/4.75 x 100 = 0%
% error Ka = (experimental - theoretical)/ theoretical x 100 = (1.78 x 10-5 -1.76 x 10-5) /1.76 x 10-5 x 100 = 11.36%
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