Chapter 14, Problem 133E

Place the species in each of the following groups in order of increasing acid strength.

a. H₂O, H₂S, H₂Se (bond energies: H—O, 467 kJ/mol; H—S, 363 kJ/mol; H—Se, 276 kJ/mol)

b. CH₃CO₂H, FCH₂CO₂H, F₂CHCO₂H, F₃CCO₂H

c. NH₄⁺, HONH₃⁺

d. NH₄⁺, PH₄⁺ (bond energies: N—H, 391 kJ/mol; P—H, 322 kJ/mol)

Give reasons for the orders you chose.