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Ó¢ÎÄÃû³Æ£ºmercuric oxide

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2Â¥2007-09-20 08:18:13
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--- Merck Index ---

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chemcccc(½ð±Ò+1,VIP+0):thx
Title:  Mercuric Oxide, Red
CAS Registry Number:  21908-53-2
Additional Names:  Red precipitate
Molecular Formula:  HgO
Molecular Weight:  216.59.  
Percent Composition:  Hg 92.61%, O 7.39%
Literature References:  Contains 99-99.5% HgO.
Properties:  Bright red or orange-red, heavy, odorless, crystalline powder or scales; orthorhombic structure; yellow when finely powdered.  Poisonous!  Dec on exposure to light into mercury and oxygen; at 400¡ã becomes almost black, but red again on cooling; at 500¡ã dec into mercury and oxygen.  d 11.14.  Practically insol in water; sol in dil HCl or HNO3 or in solns of alkali cyanides or iodides, slowly in solns of alkali bromides; insol in alcohol.  Protect from light.
Density:  d 11.14
Use:  In marine bottom paints, diluting pigments for painting on porcelain, with graphite as depolarizer in dry batteries.  In Kjeldahl nitrogen determination; and as reagent for citric acid, thiophene, glucose, aldehyde, urea, acetone.  As reagent and catalyst in organic reactions:  J. S. Pizey, Synthetic Reagents, vol. 1 (John Wiley, New York, 1974) pp 295-319.
Therap-Cat:  Antiseptic (topical).
Therap-Cat-Vet:  Has been used as a topical antiseptic.


Title:  Mercuric Oxide, Yellow
CAS Registry Number:  21908-53-2
Additional Names:  Yellow precipitate
Molecular Formula:  HgO
Molecular Weight:  216.59.  
Percent Composition:  Hg 92.61%, O 7.39%
Literature References:  Contains 99-99.5% HgO.
Properties:  Yellow or orange-yellow, heavy, odorless powder, orthorhombic structure.  Poisonous!  Becomes red on heating and yellow again on cooling; more finely divided and more reactive than red mercuric oxide.  Other physical properties and solubilities:  see Mercuric Oxide, Red.  Protect from light.  Incompat:  Reducing agents.
Use:  Similar to that of the red oxide; in the mfr of organic mercurials.  In anal. chemistry for determining Zn or HCN; detecting acetic acid in formic acid, CO in gas mixtures.
Therap-Cat:  Topical antiseptic (ophthalmic).
Therap-Cat-Vet:  Has been used as a topical antiseptic, fungicide, in chronic skin conditions, conjunctivitis, corneal ulcers.
3Â¥2007-09-20 11:52:55
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