SnCl2•2H2O Stannous chloride dihydrate CAS 10025-69-1

Tin chloride, chemical formula SnCl2, also known as tin dichloride. There are anhydrous substances and hydrates. The former is a transparent crystal with a melting point of 246 ℃, a boiling point of 652 ℃, and a relative density of 3.95. Can dissolve in water and be oxidized in air to form insoluble chlorine oxides. Hydrolysis in water produces a precipitate of basic stannous chloride [Sn (OH) Cl]. When preparing its solution, it needs to be dissolved in concentrated hydrochloric acid and then diluted to inhibit hydrolysis. Due to its susceptibility to air oxidation, adding metal tin particles to the solution can prevent oxidation. The dihydrate SnCl2 · 2H2O is a colorless monoclinic crystal or sheet-like crystal with a melting point of 37.7 ℃ and a relative density of 2.71. It loses its water of crystallization when heated to 100 ℃. Tin (II) chloride is commonly used as a reducing agent, mordant, decolorizer, and analytical reagent in chemical industry production; Tin plating is used in the electroplating industry. Anhydrous stannous chloride is obtained by direct reaction between chlorine and molten tin; Hydrated stannous chloride can be prepared by treating sheet-like tin with hydrochloric acid, followed by evaporation and crystallization.