MERCURY (II) SILVER IODIDE

MERCURY (II) SILVER IODIDE Property

Melting point:

β: decomposes 158℃ [CRC10]

Density 

6.100

solubility 

insoluble in H2O, dilute acid solutions

form 

Powder

color 

Yellow

Water Solubility 

insoluble H2O, dilute acids; soluble in solutions of alkali iodides or cyanides [MER06]

Sensitive 

Light Sensitive

Exposure limits

ACGIH: TWA 0.025 mg/m3 (Skin)
NIOSH: IDLH 10 mg/m3; TWA 0.05 mg/m3; Ceiling 0.1 mg/m3

Safety

Risk Statements 

26/27/28-33-50/53

Safety Statements 

13-28-45

RIDADR 

2025

HazardClass 

6.1

PackingGroup 

II

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Hazard statements

H300Fatal if swallowed

H310Fatal in contact with skin

H330Fatal if inhaled

H373May cause damage to organs through prolonged or repeated exposure

H400Very toxic to aquatic life

H410Very toxic to aquatic life with long lasting effects

Precautionary statements

P304+P340IF INHALED: Remove victim to fresh air and Keep at rest in a position comfortable for breathing.

P320Specific treatment is urgent (see … on this label).

P330Rinse mouth.

P405Store locked up.

MERCURY (II) SILVER IODIDE Chemical Properties,Usage,Production

Chemical Properties

Yellow powder, becomes red at 40–50C. Soluble in solutions of potassium cyanide or potassium iodide; insoluble in dilute acids and water.

Uses

Thermal sensor to detect overheating in journal bearings, etc., becomes blood-red at 40-50° and yellow again on cooling.

Hazard

Highly toxic by ingestion, inhalation, and skin absorption.

Synthesis

Mercury silver iodide was synthesized as follows: the raw materials for the synthesis were mercury nitrate, potassium iodide and silver nitrate were dialyzed pure reagents. Weigh 3.3362 g (0.01 mol) Hg (NO) 2 added to 120 ml of distilled water, stirring constantly to allow full dissolution, and then gradually added drops containing 6.64 g (0.04 mol) KI solution, began to have an orange precipitate, continue to add drops of KI so that the resulting precipitate is completely dissolved, to obtain a clarified solution. Then 3.418 g (i.e., 0.02 mol) of AgNO3 solution which had been dissolved was added dropwise to the clarified solution, and a yellow precipitate was obtained, and in order to obtain the nanoproducts, 1% to 3% of surfactant could be added, and when the dropwise addition of AgNO3 was completed, it was then left to stand for a period of time. The precipitate was filtered and dried to obtain a yellow product (spare).