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Merck
CN

20840

Sodium cacodylate trihydrate

≥98.0% (T), solid, purum. p.a.

Synonym(s):

Cacodylic acid sodium salt trihydrate, Dimethylarsinic acid sodium salt, Dimethylarsonic acid sodium salt

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About This Item

Linear Formula:
(CH3)2AsO2Na · 3H2O
CAS Number:
6131-99-3
Molecular Weight:
214.03
NACRES:
NA.21
PubChem Substance ID:
57647877
UNSPSC Code:
12352100
EC Number:
204-708-2
MDL number:
MFCD00149079
Beilstein/REAXYS Number:
3702348
Assay:
≥98.0% (T)
Form:
solid

Key Documents

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Product Name

Sodium cacodylate trihydrate, purum p.a., ≥98.0% (T)

form

solid

InChI key

RLGWPHBPRCROJO-UHFFFAOYSA-M

InChI

1S/C2H7AsO2.Na.3H2O/c1-3(2,4)5;;;;/h1-2H3,(H,4,5);;3*1H2/q;+1;;;/p-1

SMILES string

[Na+].[H]O[H].[H]O[H].[H]O[H].C[As](C)([O-])=O

grade

purum p.a.

assay

≥98.0% (T)

anion traces

chloride (Cl-): ≤100 mg/kg
sulfate (SO42-): ≤200 mg/kg

cation traces

Ca: ≤100 mg/kg
Cd: ≤50 mg/kg
Co: ≤50 mg/kg
Cu: ≤50 mg/kg
Fe: ≤50 mg/kg
K: ≤500 mg/kg
Ni: ≤50 mg/kg
Pb: ≤50 mg/kg
Zn: ≤50 mg/kg

Quality Level

200

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Application

Sodium cacodylate trihydrate may be employed as buffer to maintain pH 7.4 in electron microscopic studies. It may be used to compose cacodylate buffer for use in electron microscopic studies.

General description

Sodium cacodylate trihydrate is a biological buffer. Its crystals have been analyzed by single-crystal X-ray diffraction studies. Studies suggested its crystals exhibited two phases, viz. penta-μ-aqua-disodium(I) bis(dimethylarsenate), {[Na2(H2O)5](C2H6AsO2)2}n and di-μ-aqua-bis[triaquasodium(I)] bis(dimethylarsenate), [Na2(H2O)8](C2H6AsO2)2.

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Danger

Hazard Classifications

Acute Tox. 3 Inhalation - Acute Tox. 3 Oral - Aquatic Acute 1 - Aquatic Chronic 1 - Carc. 1B

Storage Class

6.1B - Non-combustible acute toxic Cat. 1 and 2 / very toxic hazardous materials

wgk

WGK 3

ppe

Eyeshields, Faceshields, Gloves, type P2 (EN 143) respirator cartridges

Regulatory Information

危险化学品
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Certificates of Analysis (COA)

Lot/Batch Number
BCCP1491
BCCL8962
BCCH1167
BCCD4275
BCBZ4430

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Anders Lennartson et al.
Acta crystallographica. Section C, Crystal structure communications, 64(Pt 1), m13-m16 (2008-01-25)
Crystals from commercial samples of sodium cacodylate trihydrate, NaO2As(CH3)2 x 3 H2O, were analyzed by single-crystal X-ray diffraction and two phases were identified, viz. penta-mu-aqua-disodium(I) bis(dimethylarsenate), {[Na2(H2O)5](C2H6AsO2)2}n, (I), and di-mu-aqua-bis[triaquasodium(I)] bis(dimethylarsenate), [Na2(H2O)8](C2H6AsO2)2, (II). Both (I) and (II) form layered structures
Kathleen A Hinds et al.
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