Ammoniated mercury | White precipitate | Mercury amide chloride

13 Des

Ammoniated Mercury
Hg(NH 2 )Cl 252.07
Mercury amide chloride.
Mercury amide chloride [10124-48-8 ].
»Ammoniated Mercury contains not less than
98.0percent and not more than 100.5percent of
Hg(NH 2 )Cl.
Packaging and storage— Preserve in well-
closed,light-resistant containers.
Identification—
A: A0.1-g portion is soluble,with the evolution of
ammonia,in a cold solution of 1g of sodium
thiosulfate in 2mLof water.When this solution is
heated gently,a rust-colored mixture is
formed,from which a red precipitate is obtained
on centrifugation.If the solution is strongly
heated,a black mixture forms.
B: When heated with 1Nsodium hydroxide,it
becomes yellow,and ammonia is evolved.
C: Asolution in warm acetic acid yields with
potassium iodide TSa red precipitate,which is
soluble in an excess of the reagent.The solution
yields a white precipitate with silver nitrate TS.
Residue on ignition á281ñ : not more than 0.2%.
Mercurous compounds— Dissolve 2.5g in 25mLof
warm hydrochloric acid,filter through a tared
filtering crucible,wash with water,and dry at 60
to constant weight:the weight of the residue
does not exceed 5mg (0.2%).
Assay— Mix about 0.25g of Ammoniated
Mercury,accurately weighed,with about 10mLof
water.Add 3g of potassium iodide,mix occasionally
until dissolved,and add about 40mLof water.Add
methyl red TS,and titrate with 0.1Nhydrochloric
acid VS.Perform a blank determination,and make
any necessary correction.Each mLof
0.1Nhydrochloric acid is equivalent to 12.60mg of
Hg(NH 2 )Cl.
Auxiliary Information— Staff Liaison : Behnam
Davani,Ph.D.,MBA,Senior Scientist
Expert Committee:(PA7)Pharmaceutical Analysis 7
USP28–NF23 Page 1217
Phone Number:1-301-816-8394

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