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Sodium formate;Formic acid sodium salt, also known as sodium formate, crystallization contains two crystal water, so also known as sodium dihydrate, sodium dihydrate, sodium formatehydrate.Sodium formate is the simplest organic carboxylate, white crystal or powder, slightly formic acid smell.Slightly deliquescence and hygroscopicity.Soluble in about 1.3 parts of water and glycerin, slightly soluble in ethanol, octanol, insoluble in ether.The aqueous solution is alkaline.When heated, sodium formate breaks down into hydrogen and sodium oxalate, which then forms sodium carbonate.Sodium formate is mainly used in the production of insurance powder, oxalic acid and formic acid.Used in leather industry as camouflage acid in chrome tanning process, catalyst and stabilizer, reducing agent in printing and dyeing industry.Sodium formate is harmless to humans and can irritate the eyes, respiratory system and skin.The molecular formula is CHO2Na, and the chemical structural formula is HCOONa, HCOONa·2H2O.
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Chemical formula MgCl2.Common is magnesium chloride hexahydrate, also known as magnesia hydrochloride, its chemical formula is MgCl2·6H2O, formula 203.30.The crystals are colorless and deliquescent monoclinic crystals with a salty taste.1.569 g/cm3 density, melting point 118 ℃ (decomposition), easily soluble in water and ethanol.Higher than 170 ℃ when generating alkaline magnesium chloride and hydrochloric acid.600 ℃ decomposition generated magnesium oxide and hydrogen chloride.
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Colorless cubic crystal, white or grayish white, granular, honeycomb block, spherical, irregular granular, powdered.Slightly toxic, odorless, slightly bitter taste.Hygroscopicity is very strong, easy to deliquescent when exposed to air.It is soluble in water and emits a large amount of heat (the enthalpy of dissolution of calcium chloride is -176.2 CAL /g). The aqueous solution is slightly acidic.Soluble in alcohol, acetone, acetic acid.When interacting with ammonia or ethanol, CaCl2·8NH3 and CaCl2·4C2H5OH complexes are generated, respectively.Under the low temperature solution crystallization and precipitation of six water content, heating gradually to 30 ℃ is dissolved in the crystallization of the water itself, continue to heat water loss gradually, to 200 ℃ when become dihydrate, heated to 260 ℃ was white vesicular anhydrous calcium chloride.
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Sodium metosulfite is white or yellow crystalline powder or small crystal, with strong smell of SO2, specific weight 1.4, soluble in water, the aqueous solution is acidic, contact with strong acid will release SO2 and generate the corresponding salt, long time in the air, it will be oxidized into Na2S2O6, so the product can not be stored for a long time.Above 150 degrees Celsius, SO2 is decomposed.
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Odorless, silver-white metal powder, pure aluminum foil with a small amount of lubricants, crushed and crushed to a scale powder, and then polished. Aluminum powder is light, high floating power, strong hiding power, good reflection performance of light and heat.
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Medium chrome yellow;The pigments used to be called Yellow 34.Main ingredients for lead chromate pigments, its chemical composition is PbCrO4, content is about 90% ~ 90%, appearance is pale red yellow powder, for monoclinic crystal shape, density of 5.1 ~ 6.0 g/cm3, oil absorption is 13 ~ 27 g / 100 g, excellent color and permeability resistance, hiding power between chrome yellow in the shallow and deep chrome yellow, lightness and equal light chrome yellow, better than the dark chrome yellow, acid resistance and equal light chrome yellow, better than the dark chrome yellow, alkali resistance is poor, good dispersion.
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