A solution is adjusted to pH 1 with an NH4+-NH3 buffer? Will CoS precipitate from this solution if it also contains 0.10 M in Co(NO3)2 nd 0.10 M in H2S? A saturated solution of H2S has [H2S]=0.10 M. H2S(aq) -> 2H+(aq)+ S2-(aq). Ka=1.1x10^-20. Ksp CoS=4.0x10^-21
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