Chemical properties and uses of stannous chloride

Stannous chloride, chemical formula SnCl2, also known as tin dichloride. The former is a transparent crystal with a melting point of 246℃, a boiling point of 652℃, and a relative density of 3.95. Soluble in water and oxidized in air to form insoluble chloride oxides. It is hydrolyzed in water to form a precipitation of basic stannous chloride (Sn(OH)Cl). When preparing its solution, it is necessary to dissolve it with concentrated hydrochloric acid and then dilute it to inhibit the hydrolysis. Since it is easy to be oxidized by air, adding metal tin granules to the solution can prevent oxidation. SnCl2·2H2O dihydrate is a colorless monoclinic crystal or sheet crystal with a melting point of 37.7℃ and a relative density of 2.71. When heated to 100℃, the crystalline water is lost. Stannous chloride is often used in chemical industry as reducing agent, mordant, decolorizing agent and analytical reagent. Used in the electroplating industry for tin plating. Anhydrous stannous chloride is obtained by the direct reaction of chlorine and molten tin. Stannous chloride hydrate can be prepared by treating sheet tin with hydrochloric acid, then evaporating and crystallizing.
Stannous chloride is used in dyes, spices, mirror making, electroplating and other industries; And used as ultra-high pressure lubricating oil, bleach, used as reducing agent, mordant, decolorizing agent and analytical reagent, used for the determination of silver, arsenic, molybdenum, mercury. The activity of inorganic phosphorus and alkaline phosphatase in serum was determined. Determination of phosphorus content in soil and plant by molybdenum blue method. Organic reaction catalyst. Used as acid tin plating, main salt use. Used for glass mirror industry, as silver nitrate plating sensitizer, so that the coating brightness is good, in ABS electroplating when adding this product coating is not easy to fall off.

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Preparation method
1: Weigh 0.5 g stannous chloride. 2: Put the measured stannous chloride into a 25ml beaker, then dissolve it with 2.5ml concentrated hydrochloric acid. 3: Heat it in the oven at 105 degrees for 10min. 4: Remove and cool to room temperature, transfer it to a 25mL volumetric bottle, constant volume to 25ml. 5: Add a tin grain and put it in the fridge. Reason: When SnCl2 is dissolved in water, a hydrolysis reaction occurs: Sn2+ +2H2O? Sn(OH)2+2H+, and the degree of hydrolysis is very large, Sn(OH)2 will precipitate, and make the solution cloudy. Therefore, it is necessary to dissolve it in concentrated hydrochloric acid to inhibit its hydrolysis during the dissolution, so as to get a clear and transparent stannous chloride solution.

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