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Merck
CN

31250

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
UNSPSC Code:
41116107
PubChem Substance ID:
329753699
EC Number:
232-140-5
MDL number:
MFCD00011368
Assay:
≥99.5%

Key Documents

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InChI key

XMXNVYPJWBTAHN-UHFFFAOYSA-N

InChI

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

SMILES string

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

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

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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. It has been reported to crystallize in orthorhombic space group. Production of potassium chromat by a new reaction system of KOH-KNO3-H2O (binary submolten salt system) has been proposed.

signalword

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

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

flash_point_f

Not applicable

flash_point_c

Not applicable

Regulatory Information

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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)
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)
Eagleson M.
Concise Encyclopedia Chemistry, 881-881 (1994)
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)
Saturnino Spiga et al.
Brain structure & function, 216(3), 171-182 (2011-04-05)
Visualization of neuronal elements is of fundamental importance in modern neuroscience. Golgi-Cox impregnation is a widely employed method that provides detailed information about morphological characteristics of neurons, but none regarding their neurochemical features. Immunocytochemical procedures, on the other hand, can
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