第四章

7.(1)E＝ ϕ^θ (Pb2+/Pb)- ϕ (Sn2+/Sn)＝0.0705V

(2)E＝ ϕ^θ (Sn2+/Sn)- ϕ (Pb2+/Pb)＝0.0201V 8.Kθ＝4.4×1010

c(Fe2+)/c(Zn2+)＝2.3×10-11

9.(1)Eθ＝0.236V

(2)ΔrG ^θ ＝－45.4kJ·mol-1 (4)E＝0.058V

10. ϕ (MnO ⁻ /Mn2+)＝1.03V＜ ϕ^θ (Cl /Cl-)，不能自发进行

4 2

11. ϕ^θ (Ni2+/Ni)＝-0.256V

12.c(H+)＝0.19mol·dm-3

14.(1) ϕ (Cr2O ²⁻ /Cr3+)＝0.680V＜ ϕ^θ (Cl /Cl-)，不能自发进行

(2) ϕ (MnO ⁻ /Mn2+)＝1.128V＜ ϕ^θ (Cl /Cl-)，不能自发进行

4 2

15.Kθ＝9.55×103 Eθ＝0.236V

16.(1) ϕ^θ (CO2+/CO)＝-0.28V

1. 电动势增加了 0.06V，E＝1.7V

18.Kθ＝3.19×1014

*20.pH≥1.3

*22.K ^θ (AgBr)＝5.3×10-18

*23.AgI(s)+e- Ag(s)＋I-(aq)， ϕ^θ (AgI/Ag)＝0.15V＜ ϕ^θ (H+/H2)