MERCUROUS SULFATE Property

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

Hazard Codes 

T+,N

Risk Statements 

26/27/28-33-50/53

Safety Statements 

13-28-45-60-61

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 and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Danger

Hazard statements

H373May cause damage to organs through prolonged or repeated exposure

H410Very toxic to aquatic life with long lasting effects

Precautionary statements

P260Do not breathe dust/fume/gas/mist/vapours/spray.

P262Do not get in eyes, on skin, or on clothing.

P280Wear protective gloves/protective clothing/eye protection/face protection.

MERCUROUS SULFATE Chemical Properties,Usage,Production

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.

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.

Air & Water Reactions

Insoluble in water.

Reactivity Profile

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

Hazard

Highly toxic.

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

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.