15. What is not a correct expression for the weak acid HA? (A)Ka = [H3O+][A-]/[HA] (B)pKa =pH- logl[A-]/[HA]] (C)pKa = logka (D)pKa = 14 - PKb

18. Using the following standard reduction potentials calculate the standard cell potential for the galvanic cell reaction given below, and determine whether or not this reaction is spontaneous under standard conditions. Pb2+(aq) + 2 Fe2+(aq) → 2 Fe3+(aq)+ Pb(s) (A)E°= -0.90 V, nonspontaneous (B)E°= -0.90 V, spontaneous (C)E° = +0.90 V, nonspontaneous (D)E° = +0.90 V, spontaneous

15. What is not a correct expression for the weak acid HA?
(A)Ka = [H₃O⁺][A-]/[HA]
(B)pKa =pH- logl[A^-]/[HA]]
(C)pKa = logka
(D)pKa = 14 - PKb

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