ALUMINUM CESIUM SULFATE Property

Melting point:

110 °C (dec.)(lit.)

Density 

2.022

solubility 

soluble in H2O; insoluble in ethanol

color 

colorless cubic crystals, crystalline

Water Solubility 

g anhydrous/100 g H2O: 18.8 (0°C), 0.40 (20°C), 22.7 (100°C) [LAN05]; insoluble alcohol [HAW93]

Safety

Hazard Codes 

Xi

Risk Statements 

36/37/38

Safety Statements 

26-36

WGK Germany 

3

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Warning

Hazard statements

H315Causes skin irritation

H319Causes serious eye irritation

H335May cause respiratory irritation

Precautionary statements

P264Wash hands thoroughly after handling.

P264Wash skin thouroughly after handling.

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

P302+P352IF ON SKIN: wash with plenty of soap and water.

P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

P321Specific treatment (see … on this label).

P332+P313IF SKIN irritation occurs: Get medical advice/attention.

P362Take off contaminated clothing and wash before reuse.

ALUMINUM CESIUM SULFATE Chemical Properties,Usage,Production

Chemical Properties

colorless, cub crystal(s); used in mineral waters [HAW93] [CRC10]

Production Methods

The alkali metals and Al are present in pollucite in about the right proportions for the formation of alum. Hence, Clusius and Stern can follow the procedure. The mineral is decomposed with hydrochloric acid, and Cs is precipitated as a low-solubility alum by treatment with sulfuric acid. Thus, 0.5 kg of very finely pulverized (0.01 mm.) pollucite in one liter of 18% hydrochloric acid is evaporated to dryness on a water bath. This procedure is repeated three times, and each time the dry residue is extracted with one liter of HaO + 100 ml. of concentrated hydrochloric acid. This is followed by suction filtration on a filter cloth. The filtered extracts are combined and concentrated to one liter, and the silicic acid, which separates almost completely, is decanted. The alum is then gradually precipitated with 200 ml. of concentrated H3SO4. After cooling, about 545 g of crude yellowish alum is obtained. The mother liquor is practically free of Cs. The crystallization is repeated several times, dissolving 250 g of the alum in 2.5 liters of boiling water in a four-liter Erlenmeyer flask. On slow cooling (constant agitation, 10 hours), the alum again separates. The material obtained after six crystallizations shows no traces of other alkali metals. One way to ensure pure alum is to check the purity of the mother liquor from which it is precipitated.

Purification Methods

Recrystallise it from hot water (3mL/g).