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31250

Sigma-Aldrich

Potassium chromate

puriss. p.a., ACS reagent, reag. Ph. Eur., ≥99.5%

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About This Item

Linear Formula:
K2CrO4
CAS Number:
7789-00-6
Molecular Weight:
194.19
EC Number:
232-140-5
MDL number:
MFCD00011368
UNSPSC Code:
41116107
PubChem Substance ID:
329753699
Assay:
≥99.5%

grade

ACS reagent
puriss. p.a.

Agency

reag. Ph. Eur.

vapor density

6.7 (vs air)

Assay

≥99.5%

impurities

≤0.005% in water insoluble matters

pH

8.6-9.8 (20 °C, 5%)

mp

971 °C (lit.)

anion traces

chloride (Cl-): ≤10 mg/kg
sulfate (SO42-): ≤50 mg/kg

cation traces

Ca: ≤50 mg/kg
Fe: ≤20 mg/kg
Na: ≤200 mg/kg
Pb: ≤50 mg/kg

SMILES string

[K+].[K+].[O-][Cr]([O-])(=O)=O

InChI

1S/Cr.2K.4O/q;2*+1;;;2*-1

InChI key

XMXNVYPJWBTAHN-UHFFFAOYSA-N

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General description

Potassium chromate (K2CrO4) is the potassium salt having morphological features similar to potassium sulfate (isostructural). Its crystals exhibit rhombic crystal system. It can be manufactured by reacting potassium dichromate with potassium hydroxide.[1] It has been reported to crystallize in orthorhombic space group.[2] Production of potassium chromat by a new reaction system of KOH-KNO3-H2O (binary submolten salt system) has been proposed.[3]

Signal Word

Danger

Hazard Classifications

Aquatic Acute 1 - Aquatic Chronic 1 - Carc. 1B Inhalation - Eye Irrit. 2 - Muta. 1B - Skin Irrit. 2 - Skin Sens. 1 - STOT SE 3

Target Organs

Respiratory system

Storage Class Code

6.1D - Non-combustible acute toxic Cat.3 / toxic hazardous materials or hazardous materials causing chronic effects

WGK

WGK 3

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Regulatory Listings

Regulatory Listings are mainly provided for chemical products. Only limited information can be provided here for non-chemical products. No entry means none of the components are listed. It is the user’s obligation to ensure the safe and legal use of the product.

PDSCL

Deleterious substance

PRTR

Specified Class I Designated Chemical Substances

ISHL Indicated Name

Substances Subject to be Indicated Names

ISHL Notified Names

Substances Subject to be Notified Names

JAN Code

31250-50KG-H:
31250-6X1KG:4548173234588
31250-6X500G:4548173234601
31250-100G:4548173234533
31250-500G:4548173234564
31250-250G:4548173234557
31250-1KG:4548173234540
31250-VAR:
31250-1.5KG:4548173234526
31250-6X250G:4548173234595
31250-BULK:
31250-6X100G:4548173234571

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Redetermination of the structures of potassium sulphate and potassium chromate: the effect of electrostatic crystal forces upon observed bond lengths.
McGinnety JA.
Acta Crystallographica Section B, Structural Science, 28(9), 2845-2852 (1972)
Eagleson M.
Concise Encyclopedia Chemistry, 881-881 (1994)
Comparative Study of Factors Influencing the Action of Corrosion Inhmitors for Mild Steel in Neutral Solution: II. Potassium Chromate.
Mercer AD and Jenkins IR.
British Corrosion Journal, 3(3), 130-135 (1968)
A new method of potassium chromate production from chromite and KOH-KNO3-H2O binary submolten salt system.
Sun Z, et al.
AIChE Journal, 55(10), 2646-2656 (2009)
Cecylia Wardak
Journal of hazardous materials, 186(2-3), 1131-1135 (2010-12-21)
A new polyvinylchloride membrane sensor for Pb(2+) with solid contact based on ionic liquid has been prepared. The electrode shows a Nernstian response for lead ions over a wide concentration range (1×10(-8) to 1×10(-1) mol L(-1)) and the slope of
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