Potassium Dichromate

K₂Cr₂O₇

IUPAC: Potassium dichromate

CAS: 7778-50-9

Overview

Potassium dichromate is a bright orange crystalline oxidizing agent used in analytical chemistry and industrial processes.

Composition

Element Symbol Atoms Atomic Mass
Oxygen O 7 15.9990
Potassium K 2 39.0980
Chromium Cr 2 51.9960

Elemental Composition

O
Oxygen ×7
38.1%
K
Potassium ×2
26.6%
Cr
Chromium ×2
35.3%

Uses

  • • Chrome plating
  • • Leather tanning
  • • Analytical chemistry (COD test)
  • • Photography

Fun Facts

  • ✦ K₂Cr₂O₇ was once used in breathalyzer tests — it changes from orange to green in the presence of alcohol

Safety

  • ⚠ Carcinogen (Cr⁶⁺)
  • ⚠ Highly toxic
  • ⚠ Strong oxidizer
  • ⚠ Environmental pollutant

Structure

SMILES

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

Properties

Type
industrial
State
solid
Molar Mass
294.19 g/mol
Density
2.6800 g/cm³
Melting Point
398.0 °C
Boiling Point
500.0 °C
Solubility
125 g/L at 20°C

Molecular Descriptors

Exact Mass
293.7728
TPSA
124.0 Ų
H-Bond Donors
0
H-Bond Acceptors
7
Rotatable Bonds
0
Heavy Atoms
11
Complexity
194.0

Related Compounds

Ammonium Nitrate

NH₄NO₃

Calcium Chloride

CaCl₂

Hydrogen Peroxide

H₂O₂

Iron(II) Sulfate

FeSO₄

Potassium Permanganate

KMnO₄

Sodium Fluoride

NaF

Sodium Hypochlorite

NaClO

Sodium Silicate

Na₂SiO₃

Zinc Chloride

ZnCl₂

Frequently Asked Questions

What is Potassium Dichromate?
Potassium Dichromate (K₂Cr₂O₇) is a industrial compound with the IUPAC name Potassium dichromate.
What is the molecular weight of Potassium Dichromate?
Potassium Dichromate has a molar mass of 294.19 g/mol.
What state is Potassium Dichromate at room temperature?
Potassium Dichromate is a solid at room temperature.
Is Potassium Dichromate organic or inorganic?
Potassium Dichromate is classified as an inorganic compound.
What elements make up Potassium Dichromate?
Potassium Dichromate (K₂Cr₂O₇) is composed of Oxygen (O), Potassium (K), Chromium (Cr).