Science help for chemistry please
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mercury (II) sulfide has very little solubility and would release very little mercury (II) ion into the environment, while mercury (II) nitrate is quite soluble and would release a lot of mercury (II). In the same way BaCl2 ingestion would kill you because Ba^2+ is toxic, but you can drink BaSO4 suspension because it is so insoluble that there is essentially no Ba^2+ ion freed by its solubility.
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Mercury(II) sulfide is practically insoluble in water, so it can't contaminate groundwater. Mercury(II) nitrate on the other hand is soluble and can easily contaminate groundwater.