实验室中如何制备H2S气体?为什么不用HNO3或浓H2SO4与FeS作用制取H2S?
能否用稀HNO3与FeS作用制备H2S?能否在水溶液中制备Al2S3?能否在MnSO4酸性溶液中通入H2S气体制MnS沉淀?为什么?
一定条件下,Ag与H2S可能发生下列反应:
2Ag(s)+H2S(g)=Ag2s(s) +H2(g)
25℃,100kPa下,将Ag置于体积比为10:1的H2(g)与H2S(g)混合气体中.
(1)Ag是否会发生腐蚀而生成Ag2S?
(2)混合气体中H2S(g)的体积分数为多少时,Ag不会发生腐蚀生成Ag2S?已知25℃时,H2S(g)和Ag2S(s)的标准摩尔生成吉布斯函数分别为-33.56kJ·mol-1和-40.26kJ·mol-1.
少量H2O2与H2S反应的主要产物是 ()
A.H2SO4
B.H2SO3
C.H2S2O3
D.S
A.c(H+) = [Ka1Ө·c(H2S) / c Ө]^1/2 mol·dm-3, c(S2-) =Ka2 Ө·c Ө
B.c(H+) = [Ka1Ө·Ka2Ө·c(H2S)/c Ө ]^1/2 mol·dm-3, c(S2-) = Ka2Ө·cӨ
C.c(H+) = [Ka1Ө·c(H2S) /c Ө ]^1/2 mol·dm-3, c(S2-) = 1/2c(H+)
D.c(H+) = [Ka1Ө·Ka2Ө·c(H2S) / c Ө ]^1/2 mol·dm-3, c(S2-) = 1/2c(H+)
A.c(H+) = [Ka1θ·c(H2S) / cθ]1/2 mol/L, c(S2-) = Ka2θ·cθ
B.c(H+) = [Ka1θ·Ka2θ·c(H2S) /cθ]1/2 mol/L, c(S2-) = Ka2θ·cθ
C.c(H+) = [Ka1θ·c(H2S) / cθ]1/2 mol/L, c(S2-) = 1/2c(H+)
D.c(H+) = [Ka1θ·Ka2θ·c(H2S) / cθ]1/2 mol/L, c(S2-) = 1/2c(H+)
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