how can you use pH to separate Nil) ions from Hg(I) ions? The solubility product of Hgs is roughly 2x 1053 and that of NiS is 3 x 1019. If we wanted to separate these two ions by a differential precipitation, how might I do that? Consider the use of hydrosulfuric acid as your precipitating agent.
Solution
Hydrosulfuric acid is the acid form of Hydrogen Sulfide (H2S).
Now, we can easily see that both of the metal compound contains Sulphur (NiS and HgS). Since NiS have more Ksp, it will be more soluble in the precipitating agent. Therefore, by adding suitable amount of Hydrosulfuric acid so that we can get a concentration of sulfur which is enough to precipitate HgS.
In this way, when solubilities of two metal salts are very different, they can be separated by precipitation.
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Blooming Together_ Growing a Community Garden Worksheet.docx
how can you use pH to separate Nil) ions from Hg(I) ions- The solubili.docx
1. how can you use pH to separate Nil) ions from Hg(I) ions? The solubility product of Hgs is
roughly 2x 1053 and that of NiS is 3 x 1019. If we wanted to separate these two ions by a
differential precipitation, how might I do that? Consider the use of hydrosulfuric acid as your
precipitating agent.
Solution
Hydrosulfuric acid is the acid form of Hydrogen Sulfide (H2S).
Now, we can easily see that both of the metal compound contains Sulphur (NiS and HgS). Since
NiS have more Ksp, it will be more soluble in the precipitating agent. Therefore, by adding
suitable amount of Hydrosulfuric acid so that we can get a concentration of sulfur which is
enough to precipitate HgS.
In this way, when solubilities of two metal salts are very different, they can be separated by
precipitation.
