Potassium hydroarsenate is an inorganic compound, an acid salt of potassium and arsenic acid with the formula K 2 HAsO 4 , colorless crystals, it dissolves in water, forms crystalline hydrates .
| Potassium Hydroarsenate | |
|---|---|
| General | |
| Systematic name | Potassium Hydroarsenate |
| Traditional names | Potassium arsenic acid, acidic |
| Chem. formula | K 2 HAsO 4 |
| Physical properties | |
| Molar mass | 218.12 g / mol |
| Chemical properties | |
| Solubility in water | 18.86 6 g / 100 ml |
| Solubility in ethanol | not soluble |
| Classification | |
| Reg. CAS number | 308103-48-2 |
Getting
- Partial neutralization of arsenic acid:
Physical Properties
Potassium hydroarsenate forms colorless crystals.
It is soluble in water, not soluble in ethanol .
Forms a crystalline hydrate of the composition K 2 HAsO 4 • n H 2 O, where n = 1, 2, 2.5, and 6.
The hydrate K 2 HAsO 4 • 2.5H 2 O forms monoclinic syngony crystals, space group P 2 1 , cell parameters a = 0.71607 nm, b = 1.81352 nm, c = 1.38156 nm, β = 125.153 °, Z = 8.
Hydrate K 2 HAsO 4 • 6H 2 O forms monoclinic syngony crystals, space group C c , cell parameters a = 0.91788 nm, b = 0.94179 nm, c = 1.25935 nm, β = 93.784 °, Z = 4 .
Literature
- Chemistry Handbook / Editorial: Nikolsky B.P. et al. - 2nd ed., rev. - M.-L.: Chemistry, 1966. - T. 1. - 1072 p.