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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:
13021-40-4
Molecular Weight:
246.26
NACRES:
NA.22
PubChem Substance ID:
24864445
UNSPSC Code:
12352100
EC Number:
235-881-2
MDL number:
MFCD00001649
Assay:
85%
Form:
powder
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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

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. Rhodizonate dianion undergoes various thermal and photochemical reactions with various oxidizing reagents in aqueous solution.

Application

Potassium rhodizonate is suitable reagent for the preparation of staining solution used in the rhodizonate test for the detection of lead. It is suitable reagent used in the preparation of barium, thallium, ammonium and silver salts rhodizonic acid by metathesis in aqueous solution.
It may be used in the following studies:
  • To cocrystallize plutonium and radium from urine in the plutonium and radium assay of urine.
  • As a dye in the spectrophotometric determination of sulfate ion.
  • To determine the acid dissociation constants of rhodizonic acid by pH potentiometric titration of potassium rhodizonate with standardized HCl.
  • As a staining agent for plagioclase in the petrographic study.

Storage Class

11 - Combustible Solids

WGK

WGK 3

Flash Point (°F)

Not applicable

Flash Point (°C)

Not applicable

PPE (personal protective equipment)

Eyeshields, Gloves, type N95 (US)

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