Chemical and Ionic Equilibrium - Result Question 120

####64. An aqueous solution of a metal bromide MBr2(0.05M) is saturated with H2S. What is the minimum pH at which MS will precipitate? Ksp  for MS=6.0×1021, concentration of saturated H2S=0.1M,K1=107 and K2=1.3×1013, for H2S.

(1993, 3M)

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Solution:

  1. For H2S,H2S2H++S2

K=K1×K2=1.3×1020

Minimum [S2] required to begin precipitation of

MS=6×10210.05=1.2×1019 K=1.3×1020=[H+]2[S2][H2S]=[H+]2(1.2×1019)0.10 [H+]=0.10MpH=1



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