ChemicalBook > CAS DataBase List > CALCIUM SELENITE

CALCIUM SELENITE

Product Name
CALCIUM SELENITE
CAS No.
856616-83-6
Chemical Name
CALCIUM SELENITE
Synonyms
Einecs 237-427-9;CALCIUM SELENITE;CALCIUM SELENITE USP/EP/BP;Selenious acid, calcium salt (1:1)
CBNumber
CB4246015
Molecular Formula
CaO3Se
Formula Weight
167.04
MOL File
Mol file
More
Less

CALCIUM SELENITE Property

Solubility Product Constant (Ksp)
pKsp: 5.53
More
Less

Hazard and Precautionary Statements (GHS)

More
Less

CALCIUM SELENITE Chemical Properties,Usage,Production

Description

Calcium selenite has the molecular formula of CaSeO3 and the molecular weight of 167.0410 g/mol. It can be prepared by the addition of sodium selenite to a solution of magnesium chloride:
CaCl2(aq)+ Na2SeO3(aq) ?CaSeO3·H2O(solid)
It can also be prepared by treating a solution of calcium chloride with selenous acid and adding sodium carbonate to start precipitation. The monohydrate is a colorless crystal with a density of 2.09 g/cm7.27 that is insoluble in water. The Ksp is 1.2×10-7.27. It is soluble in dilute acids. A dihydrate has also been observed whose molecular weight is 203.0669 g/mol. The monohydrate has a molecular weight of 185.0569 g/mol and is a monoclinic crystal with a=7.622?, b =6.745? , c=7.922?, b=108.46, V=386.4 ?3, Z=4 with a density of 3.18 g/cm3. The polyhedron around the calcium atoms is pentagonal bipyramidal and the selenite group forms a trigonal pyramid with Se and O atoms at the apices. These pyramids form layers parallel to the bc plane which are connected by hydrogen bonds involving crystal water. The selenite group acts as a bidentate ligand.
The chemistry of the system CaO–SeO2–H2O has been investigated at 23 and 80°C. The existence of four major phases in this system:
CaSeO3·H2O
Ca(HSeO3)·2H2O
Ca2(SeO3)(Se2O5)
Ca2(HSeO3)2
These have been confirmed, and the equilibria among them determined. At 23°C, CaSeO3·H2O and Ca(HSeO3)·2H2O are the stable calcium selenites. CaSe- O3·H2O exists over the pH range 12.5–3.7, making it the most important phase for natural systems as well as most technological applications. Ca(HSeO3)·2H2O is the more acidic phase; it exists over the pH range 3.7– 0.4. Incongruent dissolution of Ca(HSeO3)·2H2O forms CaSeO3·H2O. These results indicate Ca2(HSeO3)2(Se2O5) is not a stable phase at 23°C. At 80°C, CaSeO3·H2O, Ca2(SeO3)(Se2O5), and Ca2(HSeO3)2(Se2O5) are the stable calcium selenite phases. Ca(HSeO3)·2H2O has not been observed. Thus, CaSeO3·H2O exists over the broadest pH range, 11.0–3.9. Ca2(SeO3)(Se2O5) and Ca2(HSeO3)2(Se2O5) dissolve incongruently.

CALCIUM SELENITE Preparation Products And Raw materials

Raw materials

Preparation Products

More
Less

CALCIUM SELENITE Suppliers

Huainan Kedi Chemical Factory
Tel
0554-2106669
Fax
0554-2666215
Email
sales1@kedichem.com
Country
China
ProdList
4924
Advantage
55
Chengdu HuaXia Chemical Reagent Co. Ltd
Tel
400-1166-196 13458535857
Fax
QQ:800101999
Email
cdhxsj@163.com
Country
China
ProdList
13350
Advantage
58
Dideu Industries Group Limited
Tel
+86-29-89586680 +86-15129568250
Email
1026@dideu.com
Country
China
ProdList
22883
Advantage
58
Cheng Du Micxy Chemical Co.,Ltd
Tel
028-85632863 18048500443
Fax
028-85632863
Email
sales@micxy.com
Country
China
ProdList
10474
Advantage
58
More
Less

View Lastest Price from CALCIUM SELENITE manufacturers

Dideu Industries Group Limited
Product
CALCIUM SELENITE 856616-83-6
Price
US $1.10/g
Min. Order
1g
Purity
99.9%
Supply Ability
100 Tons min
Release date
2021-08-17

856616-83-6, CALCIUM SELENITERelated Search:


  • CALCIUM SELENITE
  • Einecs 237-427-9
  • Selenious acid, calcium salt (1:1)
  • CALCIUM SELENITE USP/EP/BP
  • 856616-83-6
  • 13780-12-2