Potassium hexaniobate

Potassium hexaniobate
Potassium hexaniobate
General
Systematic ; name	Potassium hexaniobate
Traditional names	Potassium niobate
Chem. formula	K 8 Nb 6 O 19
Physical properties
condition	colorless crystals
Molar mass	1174.21 g / mol
Classification
Reg. CAS number	12031-11-7

Potassium hexaniobate is an inorganic compound, a salt of potassium and niobic acid with the formula K ₈ Nb ₆ O ₁₉ , colorless crystals, it dissolves in water, forms crystalline hydrates .

Content

1 Receiving
2 Physical properties
3 Chemical properties
4 notes
5 Literature

Getting

Fusion of stoichiometric amounts of niobium pentoxide and potassium hydroxide :

{\mathsf {3Nb_{2}O_{5}+8KOH\ {\xrightarrow {T}}\ K_{8}Nb_{6}O_{19}+4H_{2}O}}

{\ displaystyle {\ mathsf {3Nb_ {2} O_ {5} + 8KOH \ {\ xrightarrow {T}} \ K_ {8} Nb_ {6} O_ {19} + 4H_ {2} O}}}

{\mathsf {3Nb_{2}O_{5}+8KOH\ {\xrightarrow {T}}\ K_{8}Nb_{6}O_{19}+4H_{2}O}}

Physical Properties

Potassium hexaniobate forms colorless crystals.

It is soluble in water with hydrolysis. Resistant in aqueous solutions with pH = 13.

It forms crystalline hydrates of the composition K ₈ Nb ₆ O ₁₉ • n H ₂ O, where n = 4 ^[1] and 16 ^[2] .

Chemical Properties

Weak alkaline (pH = 9 ÷ 13) aqueous solutions are hydrolyzed:

{\mathsf {K_{8}Nb_{6}O_{19}+H_{2}O\ {\xrightarrow {}}\ K_{7}HNb_{6}O_{19}+KOH}}

{\ displaystyle {\ mathsf {K_ {8} Nb_ {6} O_ {19} + H_ {2} O \ {\ xrightarrow {}} \ K_ {7} HNb_ {6} O_ {19} + KOH}}}

{\mathsf {K_{8}Nb_{6}O_{19}+H_{2}O\ {\xrightarrow {}}\ K_{7}HNb_{6}O_{19}+KOH}}

acid salt forms crystalline hydrates K ₇ HNb ₆ O ₁₉ • n H ₂ O, where n = 12 and 13.

Notes

↑ VG Maiorov, V. Ya. Kuznetsov, AI Nikolaev, NL Mikhailova, OA Zalkind, GI Kadyrova, VK Kopkov. On potassium hexaniobates released in the course of preparation of concentrated niobium (V) alkaline solution // Russian Journal of Applied Chemistry. - 2012. - T. 85 , No. 12 . - S. 1820-1826 . - DOI : 10.1134 / S1070427212120051 .
↑ AN Zelikman and MA Orekhov. Study on the Dissolution Behavior of K ₈ Nb ₆ O ₁₉ in KOH Solution Under High Temperature // Izvestiya Akademii Nauk SSSR, Neorganicheskie Materialy. - 1972.- T. 8 . - S. 1451-1454 .

Literature

Chemical Encyclopedia / Editorial Board: Knunyants I.L. et al. - M .: Soviet Encyclopedia, 1992. - T. 3. - 639 p. - ISBN 5-82270-039-8 .
Inorganic Synthesis Guide: 6 Vol. / Ed. Brower G. - M .: Mir, 1986 .-- T. 6 .-- 360 p.

[1] VG Maiorov, V. Ya. Kuznetsov, AI Nikolaev, NL Mikhailova, OA Zalkind, GI Kadyrova, VK Kopkov. On potassium hexaniobates released in the course of preparation of concentrated niobium (V) alkaline solution // Russian Journal of Applied Chemistry. - 2012. - T. 85 , No. 12 . - S. 1820-1826 . - DOI : 10.1134 / S1070427212120051 .

[2] AN Zelikman and MA Orekhov. Study on the Dissolution Behavior of K ₈ Nb ₆ O ₁₉ in KOH Solution Under High Temperature // Izvestiya Akademii Nauk SSSR, Neorganicheskie Materialy. - 1972.- T. 8 . - S. 1451-1454 .

Potassium hexaniobate
General
Systematic name	Potassium hexaniobate
Traditional names	Potassium niobate
Chem. formula	K ₈ Nb ₆ O ₁₉
Physical properties
condition	colorless crystals
Molar mass	1174.21 g / mol
Classification
Reg. CAS number	12031-11-7