Lithium hypophosphate

Lithium hypophosphate
Lithium hypophosphate
Are common
Systematic ; name	Lithium hypophosphate
Traditional names	Phosphate lithium
Chem. formula	Li 4 P 2 O 6
Physical properties
condition	colorless crystals
Molar mass	185.71 g / mol
Chemical properties
Water solubility	0.057 g / 100 ml

Lithium hypophosphate is an inorganic compound, the salt of lithium and phosphoric acid with the formula Li ₄ P ₂ O ₆ , slightly soluble in water, forms crystalline hydrates - colorless crystals.

Content

Getting

The reaction of lithium carbonate and phosphoric acid:

{\mathsf {2Li_{2}CO_{3}+H_{4}P_{2}O_{6}\ {\xrightarrow {}}\ Li_{4}P_{2}O_{6}\downarrow +2CO_{2}\uparrow +2H_{2}O}}

{\ displaystyle {\ mathsf {2Li_ {2} CO_ {3} + H_ {4} P_ {2} O_ {6} \ {\ xrightarrow {}} \ Li_ {4} P_ {2} O_ {6} \ downarrow + 2CO_ {2} \ uparrow + 2H_ {2} O}}}

Exchange reaction with sodium hypophosphate :

{\mathsf {4LiCl+Na_{4}P_{2}O_{6}\ {\xrightarrow {}}\ Li_{4}P_{2}O_{6}\downarrow +4NaCl}}

{\ displaystyle {\ mathsf {4LiCl + Na_ {4} P_ {2} O_ {6} \ {\ xrightarrow {}} \ Li_ {4} P_ {2} O_ {6} \ downarrow + 4NaCl}}}

Physical Properties

Lithium hypophosphate forms colorless crystals.

Slightly soluble in water.

Forms crystalline hydrates of the composition Li ₄ P ₂ O ₆ • n H ₂ O, where n = 1, 2, 6 and 7.

Chemical Properties

When heated, crystalline hydrate loses water in steps:

{\mathsf {Li_{4}P_{2}O_{6}\cdot 7H_{2}O\ {\xrightarrow[{-H_{2}O}]{120^{o}C}}\ Li_{4}P_{2}O_{6}\cdot 2H_{2}O\ {\xrightarrow[{-H_{2}O}]{200^{o}C}}\ Li_{4}P_{2}O_{6}\cdot H_{2}O}}

{\ displaystyle {\ mathsf {Li_ {4} P_ {2} O_ {6} \ cdot 7H_ {2} O \ {\ xrightarrow [{- H_ {2} O}] {120 ^ {o} C}} \ Li_ {4} P_ {2} O_ {6} \ cdot 2H_ {2} O \ {\ xrightarrow [{- H_ {2} O}] {200 ^ {o} C}} \ Li_ {4} P_ {2 } O_ {6} \ cdot H_ {2} O}}}

Literature

Plushev V.E., Stepin B.D. Chemistry and technology of compounds of lithium, rubidium and cesium. - M .: "Chemistry", 1970. - 408 p.