A solution of the pure salt yields fine prisms of the composition Na2Sn03+10H20, which effloresce in the air.
2
By evaporating in vacuo the solution obtained by dissolving iron in hydrochloric acid, there results bluish, monoclinic crystals of FeCl24H20, which deliquesce, turning greenish, on exposure to air, and effloresce in a desiccator.
3
Still further evaporation causes these crystals to effloresce and pass into the anhydrous salt.
4
The hydrated acid crystallizes in prisms which effloresce in air, and are readily soluble in water.