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Hg(NO3)2 + K2CrO4 ==> HgCrO4 + 2 NaNO3
Hg2+ + CrO4 2- ==>HgCrO4
HgS<czarny osad>
Hg(NO3)2 + H2S ==> HgS + 2HNO3
Hg2+ + S2- ==> HgS
Hg(SCN)2 <biały osad, rozpuszczalny w nadmiarze odczynnika>
Hg(NO3)2 + 2KSCN ===> Hg(SCN)2 + 2KNO3
Hg2+ + 2SCN- ===> Hg(SCN)2