What is the difference between sodium dihydrogen phosphate and disodium hydrogen phosphate, an original dispersant imported from Germany?
1. Different properties 1. Sodium dihydrogen phosphate: colorless crystal or white crystalline powder. Soluble in water, insoluble in alcohol. When placed in the air at room temperature, it loses about 5 crystal water and forms heptahydrate. When heated to 100°C, it loses all crystal water and becomes anhydrous. It decomposes into pyrophosphoric acid at 250°C. sodium.
Plastic antistatic agent
2. Different uses 1. Sodium dihydrogen phosphate. Manufacture of sodium hexametaphosphate and sodium pyrophosphate. Used to make citric acid, water softener, fabric weighting agent, fire retardant; also used in glaze, welding flux, medicine, pigment, food industry and other phosphates for industrial water treatment agent, printing and dyeing detergent, quality improvement Agent, neutralizing agent, antibiotic culture agent, biochemical treatment agent, food quality improver, anhydrous substance is white crystalline powder. Very soluble in water, easily soluble in water, the aqueous solution shows acidic reaction (PH=4.5), insoluble in alcohol, slightly soluble in mgc imitation.
Solubility of sodium dihydrogen phosphate
Sodium dihydrogen phosphate solubility: 234 (unit is g) sodium dihydrogen phosphate, also known as acidic sodium phosphate, the molecular formula is NaH2PO4·2H2O and NaH2PO4, the dihydrate is colorless to white crystals or crystals The anhydrous substance is white powder or granules. Easily soluble in water, almost insoluble in ethanol. After losing crystal water at 100℃ and continuing to heat, acidic sodium pyrophosphate will be generated. Operation and disposal Precautions for operation: Close the operation to prevent dust from being released into the workshop air. Operators must undergo special training. It is recommended that operators wear self-priming filter dust masks, chemical safety glasses, and anti-toxic substance penetration overalls to avoid the generation of dust.
Comparison of sodium dihydrogen phosphate ion concentration
Comparison of ion concentration: Na⁺PO4HPO4OH-, so H+ is acidic. It shows that the degree of ionization is greater than the degree of hydrolysis, and the source is. Ionization of water and hydrolysis of H2-; so OH->, H33- is composed of H2. Obtained by two-step ionization; the degree of second-step ionization of weak acids is very small; at least; and H2PO4. It is the main ion in the solution; Na⁺ does not hydrolyze; so Na⁺,>H2PO4⁻Extended information; Physical properties of sodium dihydrogen phosphate; disodium hydrogen phosphate It is easy to weather in the air; when placed in the air at room temperature, it loses about 5 crystal water and forms heptahydrate. When heated to 100°C, it loses all crystal water and becomes anhydrous: it decomposes into sodium pyrophosphate at 250°C: it is easily weathered in the air and easily loses five molecules of crystal water to form heptahydrate (Na₂, HPO4, ·7H2O ), soluble in water and insoluble in alcohol; the aqueous solution shows a slightly alkaline reaction (the pH of a 0.1-1N solution is about 9.0); it loses crystal water at 100°C and becomes anhydrous; it decomposes into sodium pyrophosphate at 250°C. The pH value of 1% aqueous solution is 8.8 to 9.2. Insoluble in alcohol. Melts and loses 5 crystal waters at 35.1°C. Preparation method of sodium dihydrogen phosphate. In the spray drying method, add disodium hydrogen phosphate dodecahydrate into a dissolving tank and heat to dissolve; add a small amount of industrial phosphoric acid. Adjust pH8.8-9.0. The solution temperature is 80-85°C: pump it to the metering tank and atomize it through a sprayer. The atomizer uses a two-flow pneumatic nozzle, the steam pressure is 0.15-0.3 MPa, and the steam flow guide angle of the atomizer is 30° with the horizontal.
