Potassium manganate

Manganate potassium
Manganate potassium
Are common
Systematic ; name	Manganate potassium
Chem. formula	K 2 MnO 4
Rac formula	K 2 MnO 4
Physical properties
condition	solid
Molar mass	197.132 g / mol
Density	2.78 g / cm³
Thermal properties
T. melt.	190 ° C
Classification
Reg. CAS number	10294-64-1
Pubchem
Reg. EINECS number
SMILES
Inchi
Chemspider

Potassium manganate is a complex inorganic substance with the chemical formula K ₂ Mn O ₄ .

Content

Description

Potassium manganate is a salt of dark green color. Melting under the pressure of oxygen. In solution, it is stable only in a strongly alkaline medium. The green color of the solution corresponds to the ion MnO ₄ ²⁻ . Slowly decomposes when the solution is diluted with water, quickly - upon acidification. Shows redox properties.

Getting

Fusion of MnO ₂ with strong oxidizing agents:

${\mathsf {MnO_{2}+\ 2KOH+\ KNO_{3}\longrightarrow \ K_{2}MnO_{4}+\ KNO_{2}+\ H_{2}O}}$ ${\ displaystyle {\ mathsf {MnO_ {2} + \ 2KOH + \ KNO_ {3} \ longrightarrow \ K_ {2} MnO_ {4} + \ KNO_ {2} + \ H_ {2} O}}}$

${\mathsf {3MnO_{2}+\ 3K_{2}CO_{3}+\ KClO_{3}\longrightarrow \ 3K_{2}MnO_{4}+\ KCl+\ 3CO_{2}}}$ ${\ displaystyle {\ mathsf {3MnO_ {2} + \ 3K_ {2} CO_ {3} + \ KClO_ {3} \ longrightarrow \ 3K_ {2} MnO_ {4} + \ KCl + \ 3CO_ {2}}}$

By heating potassium permanganate :

${\mathsf {2KMnO_{4}{\xrightarrow {t^{o}}}\ K_{2}MnO_{4}+\ MnO_{2}+\ O_{2}}}$ ${\ displaystyle {\ mathsf {2KMnO_ {4} {\ xrightarrow {t ^ {o}}} \ K_ {2} MnO_ {4} + \ MnO_ {2} + \ O_ {2}}}$

Chemical Properties

1. Interaction with water :

${\mathsf {3K_{2}MnO_{4}+\ 2H_{2}O\longrightarrow \ 2KMnO_{4}+\ MnO_{2}+\ 4KOH}}$ ${\ displaystyle {\ mathsf {3K_ {2} MnO_ {4} + \ 2H_ {2} O \ longrightarrow \ 2KMnO_ {4} + \ MnO_ {2} + \ 4KOH}}}$

2. Interaction with diluted HCl :

${\mathsf {3K_{2}MnO_{4}+\ 4HCl\longrightarrow \ 2KMnO_{4}+\ MnO_{2}+\ 2H_{2}O+\ 4KCl}}$ ${\ displaystyle {\ mathsf {3K_ {2} MnO_ {4} + \ 4HCl \ longrightarrow \ 2KMnO_ {4} + \ MnO_ {2} + \ 2H_ {2} O + \ 4KCl}}}$

3. Interaction with chlorine :

${\mathsf {2K_{2}MnO_{4}+\ Cl_{2}\longrightarrow \ 2KMnO_{4}+\ 2KCl}}$ ${\ displaystyle {\ mathsf {2K_ {2} MnO_ {4} + \ Cl_ {2} \ longrightarrow \ 2KMnO_ {4} + \ 2KCl}}}$

Literature

Lidin R. A. “Schoolboy Handbook. Chemistry ”M .: Asterel, 2003.