392340
Potassium rhodizonate
technical grade, 85%
Synonym(s):
3,4,5,6-Tetraoxocyclohexene-1,2-diol dipotassium salt, Rhodizonic acid potassium salt
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About This Item
Linear Formula:
C6O6K2
CAS Number:
Molecular Weight:
246.26
EC Number:
MDL number:
UNSPSC Code:
12352100
PubChem Substance ID:
NACRES:
NA.22
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grade
technical grade
Assay
85%
form
powder
mp
>300 °C (lit.)
SMILES string
[K+].[K+].[O-]C1=C([O-])C(=O)C(=O)C(=O)C1=O
InChI
1S/C6H2O6.2K/c7-1-2(8)4(10)6(12)5(11)3(1)9;;/h7-8H;;/q;2*+1/p-2
InChI key
NEWIILAQDSMNML-UHFFFAOYSA-L
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General description
Potassium rhodizonate (3,4,5,6-Tetraoxocyclohexene-1,2-diol dipotassium salt, Rhodizonic acid potassium salt), a benzoquinone derivative, is the potassium salt of rhodizonic acid. Its crystalline structure has been reported and it exhibits space group Fddd.[1] Rhodizonate dianion undergoes various thermal and photochemical reactions with various oxidizing reagents in aqueous solution.[2]
Application
Potassium rhodizonate is suitable reagent for the preparation of staining solution used in the rhodizonate test for the detection of lead.[3] It is suitable reagent used in the preparation of barium, thallium, ammonium and silver salts rhodizonic acid by metathesis in aqueous solution.[2]
It may be used in the following studies:
It may be used in the following studies:
- To cocrystallize plutonium and radium from urine in the plutonium and radium assay of urine.[4][5]
- As a dye in the spectrophotometric determination of sulfate ion.[6]
- To determine the acid dissociation constants of rhodizonic acid by pH potentiometric titration of potassium rhodizonate with standardized HCl.[7]
- As a staining agent for plagioclase in the petrographic study.[8]
Storage Class Code
11 - Combustible Solids
WGK
WGK 3
Flash Point(F)
Not applicable
Flash Point(C)
Not applicable
Personal Protective Equipment
dust mask type N95 (US), Eyeshields, Gloves
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Dipotassium rhodizonate.
Cowan JA and Howard JAK.
Acta Crystallographica Section E, Structure Reports Online, 60(4), 511-513 (2004)
A spectrophotometric determination of sulfate ion and its application in studies of substrate purity and of aryl sulfatase A kinetics.
A Waheed et al.
Analytical biochemistry, 89(2), 550-560 (1978-09-01)
Radiochemical determination of radium in urine.
Weiss HV and Lai MG.
Analytical Chemistry, 33(1), 39-41 (1961)
Analysis of sulfate in complex carbohydrates.
L J Silvestri et al.
Analytical biochemistry, 123(2), 303-309 (1982-07-01)
Refined techniques for staining plagioclase and alkali feldspars in thin section.
Houghton HF
Journal of Sedimentary Research, 50(2), 629-631 (1980)
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