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OpenStudy (anonymous):
Waste water from certain industrial chemical processes contains aqueous Hg 2 2+ {{\rm Hg}_{2}}^{2+} ions. Since the mercury ion is toxic, it is removed from the waste water by reaction with aqueous sodium sulfide. The products of the reaction are solid mercury( I ) sulfide and aqueous sodium ions.
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thatonenerd:
Use Hvap of water = 40.7 kJ/mol, c of water = 4.184 J/g.u00b0C, and molar mass of HO = 18.
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