ChemicalBook CAS DataBase List 7783-36-0

7783-36-0

Name	MERCUROUS SULFATE
CAS	7783-36-0
EINECS(EC#)	231-993-0
Molecular Formula	Hg2O4S
MDL Number	MFCD00016138
Molecular Weight	497.24
MOL File	7783-36-0.mol

Chemical Properties

Appearance	White, pale yellow or beige powder
Melting point	decomposes [AES93]
density	7.56 g/mL at 25 °C(lit.)
solubility	soluble in dilute HNO 3
form	Powder
color	White, pale yellow or beige
Water Solubility	0.05g/100g H2O [KIR81]; soluble dilute HNO3 [MER06]
Merck	13,5924
Solubility Product Constant (Ksp)	pKsp: 6.19
CAS DataBase Reference	7783-36-0(CAS DataBase Reference)
EPA Substance Registry System	Sulfuric acid, dimercury(1+) salt (7783-36-0)

Safety Data

Hazard Codes	T+,N
Risk Statements	R26/27/28:Very Toxic by inhalation, in contact with skin and if swallowed . R33:Danger of cumulative effects. R50/53:Very Toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment . less more
Safety Statements	S13:Keep away from food, drink and animal feeding stuffs . S28:After contact with skin, wash immediately with plenty of ... (to be specified by the manufacturer) . S45:In case of accident or if you feel unwell, seek medical advice immediately (show label where possible) . S60:This material and/or its container must be disposed of as hazardous waste . S61:Avoid release to the environment. Refer to special instructions safety data sheet . less more
RIDADR	UN 1645 6.1/PG 2
WGK Germany	3
RTECS	OX0480000
F	8
HazardClass	6.1(a)
PackingGroup	II
HS Code	28521000
Hazardous Substances Data	7783-36-0(Hazardous Substances Data)

Hazard Information

Chemical Properties

White, pale yellow or beige powder

Uses

For making electric batteries; with zinc sulfate in the standard Clark cell and with cadmium sulfate in the standard Weston cell.

General Description

White to yellow crystalline powder. Soluble in hot sulfuric acid, dilute nitric acid. Highly toxic.

Reactivity Profile

MERCUROUS SULFATE(7783-36-0) is incompatible with the following: Acetylene, ammonia, chlorine dioxide, azides, calcium (amalgam formation), sodium carbide, lithium, rubidium, copper .

Air & Water Reactions

Insoluble in water.

Hazard

Highly toxic.

Description

Mercury(I) sulfate, commonly called mercurous sulfate, Hg2SO4, is a metallic compound that forms a white, pale yellow or beige powder. It is a metallic salt of sulfuric acid produced by replacing both hydrogen atoms with mercury(I). It is very toxic; it can be fatal if inhaled, ingested, or absorbed by skin. The crystal structure of mercurous sulfate is made up of Hg2 21 dumbbells and SO4 22 anions as main building units. The Hg2 21 dumbbell is surrounded by 4 oxygen atoms with Hg?O distance between 2.23 and 2.93 ? , while the Hg-Hg distance is about 2.50 ? . Mercury(I) sulfate has the mercury atoms arranged in doublets with a bond distance of 2.50 ? . The metal atom doublets are oriented parallel to the a-axis in a unit cell. Mercury doublets form part of infinite chain SO4-Hg-Hg-SO4-Hg-Hg-... The Hg-Hg-O bond angle is 165° ± 1° . The chain crosses the unit cell diagonally. The mercury sulfate structure is held together by weak Hg-O interactions. The SO4 does not act as a single anion, but rather coordinated to the mercury metal.

Purification Methods

The white-yellow powder is recrystallised from dilute H2SO4., dried in a vacuum under N2, and stored in the dark. Its solubility in H2O is 0.6% at 25o. It is hydrolysed by excessive washing with H2O to form the greenish-yellow basic salt Hg2SO4.Hg2O.H2O.

Synthesis

One method to produce mercury(I) sulfate is to react the acidic solution of mercury(I) nitrate with a concentrated sulfuric acid solution.
Hg2 (NO3)2 + H2SO4→Hg2SO4 + 2HNO3
It can also be formed by reacting an excess of mercury with concentrated sulfuric acid.
2Hg + 2H2SO4→Hg2SO4 + 2H2O + SO2

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