Sodium hydroxide, also known as caustic soda, caustic soda and caustic soda, is an inorganic compound with the chemical formula of NaOH. Sodium hydroxide is strongly alkaline and corrosive, and can be used as acid neutralizer, complexing masking agent, precipitant, precipitation masking agent, color developing agent, saponifying agent, stripping agent, detergent, etc. , and is widely used.
August 26th, 2023: CSRC agreed to register caustic soda futures and options in Zhengzhou Commodity Exchange. In the next step, the CSRC will urge Zhengzhou Commodity Exchange to do a good job to ensure the smooth launch and steady operation of caustic soda futures and options. Sodium hydroxide is corrosive to fiber, skin, glass and ceramics. When dissolved or diluted with concentrated solution, heat will be released.
Silver nitrate is an inorganic compound with chemical formula of AgNO3, which is a white crystalline powder, easily soluble in water, ammonia and glycerol, and slightly soluble in ethanol. Pure silver nitrate is stable to light, but its aqueous solution and solid are often stored in brown reagent bottle due to the lack of purity of general products.
Used in emulsion, silver plating, mirror making, printing, medicine, hair dyeing, chlorine ion, bromine ion and iodine ion detection, etc. , also used in the electronics industry. It is listed in the List of Explosive Hazardous Chemicals and controlled according to the Measures for the Administration of Public Security of Explosive Hazardous Chemicals.
chemical property
Silver nitrate will turn gray-black when it meets organic matter and decompose into silver. Pure silver nitrate is stable to light, but its aqueous solution and solid are often stored in brown reagent bottle due to the lack of purity of general products. When silver nitrate is heated to 444℃, it is decomposed into silver, nitrogen, oxygen and nitrogen dioxide. The aqueous solution and ethanol solution are neutral to litmus, and the pH value is about 6.
The boiling point is 444℃ (decomposition). It is oxidizing. In the presence of organic matter, light will turn gray or gray-black. Silver nitrate can precipitate or coordinate with a series of reagents. For example, it reacts with hydrogen sulfide to generate black silver sulfide Ag2S precipitate; It reacts with potassium chromate to produce reddish-brown silver chromate Ag2CrO4 precipitate.