a) Consider: A4(aq) + 2 H3O*(aq) –→ H2A² (aq) + 2 H2O(1). This is the net ionic reaction that occurs between the beginning of the titration and to the equivalence point. (Type in 1st, 2nd, 3rd or 4th.) b) After point along the titration curve, the analyte is just starting to gain the 4th proton. (Type in A, B, C...) c) The point along the titration curve where concentrations of H2A²¯ and H3A¯ are equal is (Турe in A, B, С...) d) Molecules and ions: H4A, H3A', H2A²", HA3- or A4- Of the molecule and ions shown above, the molecule or ion that has the highest concentration when 36.0 mL of 0.15 M HCI has been added is (Do not use super- or subscripts. Write H3A¯ as H3A-.) For H4A: Ka1 = 2.5 x 102, Ka2 = 7.5 x 105, Ka3 = 9.2 x 10-9, and Ka4 = 4.3 x 10-13 e) The pH at midpoint 2 is (Report your pH va to two sig figs.) f) The value of Kp3 for A4 is . (Use two sig figs.) (Do not use superscripts, subscripts or carets! Write 1.2 x 103 as 1.2x10-3 or 1.2e-3.)

a) Consider: A4(aq) + 2 H3O*(aq) –→ H2A² (aq) + 2 H2O(1). This is the net ionic reaction that occurs between the beginning of the titration and to the equivalence point. (Type in 1st, 2nd, 3rd or 4th.) b) After point along the titration curve, the analyte is just starting to gain the 4th proton. (Type in A, B, C...) c) The point along the titration curve where concentrations of H2A²¯ and H3A¯ are equal is (Турe in A, B, С...) d) Molecules and ions: H4A, H3A', H2A²", HA3- or A4- Of the molecule and ions shown above, the molecule or ion that has the highest concentration when 36.0 mL of 0.15 M HCI has been added is (Do not use super- or subscripts. Write H3A¯ as H3A-.) For H4A: Ka1 = 2.5 x 102, Ka2 = 7.5 x 105, Ka3 = 9.2 x 10-9, and Ka4 = 4.3 x 10-13 e) The pH at midpoint 2 is (Report your pH va to two sig figs.) f) The value of Kp3 for A4 is . (Use two sig figs.) (Do not use superscripts, subscripts or carets! Write 1.2 x 103 as 1.2x10-3 or 1.2e-3.)

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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