Let H2A represent a diprotic acid and let A² represent its corresponding base. A 40.0 mL sample of 0.25 M A²- was titrated with 0.50 M HCI. The following data were gathe during the titration. Volume HCl added (mL) 10.00 20.00 30.00 40.00 pH 11.55 8.95 6.35 3.63 What is Ka2 for H2A? 4.8 × 10-11 4.5 x 10-7 2.8 x 10-12 3.6 x 10-3 None of these

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Let H2A represent a diprotic acid and let A? represent its corresponding base.
A 40.0 mL sample of 0.25 M A²- was titrated with 0.50 M HCI. The following data were gathered
during the titration.
Volume HCI added (mL)
10.00
20.00
30.00
40.00
pH
11.55
8.95
6.35
3.63
What is Ka2 for H2A?
4.8 x 10-11
4.5 x 10-7
2.8 x 10-12
3.6 x 10-3
None of these
2.2 x 10-8
Transcribed Image Text:Let H2A represent a diprotic acid and let A? represent its corresponding base. A 40.0 mL sample of 0.25 M A²- was titrated with 0.50 M HCI. The following data were gathered during the titration. Volume HCI added (mL) 10.00 20.00 30.00 40.00 pH 11.55 8.95 6.35 3.63 What is Ka2 for H2A? 4.8 x 10-11 4.5 x 10-7 2.8 x 10-12 3.6 x 10-3 None of these 2.2 x 10-8
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