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A 200-ML Sample of 0

Question 47

Multiple Choice

A 20.0-mL sample of 0.50 M H2C6H6O6 (ascorbic acid, a diprotic acid) was titrated with 0.50 M NaOH. The following data were gathered during the titration. A 20.0-mL sample of 0.50 M H<sub>2</sub>C<sub>6</sub>H<sub>6</sub>O<sub>6 </sub>(ascorbic acid, a diprotic acid) was titrated with 0.50 M NaOH. The following data were gathered during the titration. What is K<sub>a2</sub> for ascorbic acid? A) 6.8 × 10 <sup>−</sup><sup>5</sup> B) 6.2 × 10 <sup>−</sup><sup>6</sup> C) 6.2 × 10 <sup>−</sup><sup>7</sup> D) 6.2 × 10 <sup>−</sup><sup>8</sup> E) 2.8 × 10 <sup>−</sup><sup>12</sup> What is Ka2 for ascorbic acid?


A) 6.8 × 10 −5
B) 6.2 × 10 −6
C) 6.2 × 10 −7
D) 6.2 × 10 −8
E) 2.8 × 10 −12

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