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AOCHUANG CHEMICAL

Sodium dihydrogen phosphate

Sodium dihydrogen phosphate, also known as acidic sodium phosphate, has the molecular formula of NaH2PO4·2H2O and NaH2PO4, and the relative molecular masses are 156.01 and 119.98. An anhydrate and a dihydrate, the dihydrate is a colorless to white crystal or a crystalline powder, and the anhydrate is a white powder or granule. Soluble in water, almost insoluble in ethanol. When the crystal water is lost at 100 ° C and heating is continued, acid sodium pyrophosphate is formed.
CAS No.: 7558-80-7
Chemical formula and relative molecular mass: NaH2PO4: 119.98 g/mol
colorless crystal or white crystalline powder. Odorless, salty, sour. Heated to 100 ° C lost all of the water of crystallization, burning into sodium metaphosphate. Soluble in water, almost insoluble in ethanol, its aqueous solution is acidic. The pH of the 0.1 mol/L aqueous solution at 25 ° C was 4.5. The relative density is 1.915. The temperature of 60 ° C. The product also has a molecule of crystal water.

Uses: granules. Softener. Production of sodium hexametaphosphate and sodium pyrophosphate. Determination of magnesium. A modified white medium was prepared in a single sports species.

Quality index
Arsenic (As), % ≤ 0.0002
ammonium (NH4), % ≤ 0.002
ammonia precipitate , % ≤ 0.01
pH (50g / L, 25 ° C) 4.2 ~ 4.6
water insoluble matter, % ≤ 0.01
heavy metal (in Pb) , % ≤ 0.001
potassium (K), % ≤ 0.02
iron (Fe), % ≤ 0.001
chloride (Cl), % ≤ 0.005
sulfate (SO4), % ≤ 0.005
nitrate (NO3), % ≤ 0.001
clarity test Qualified
content (NaH2PO4·2H2O), % ≥99.0
Density 1.949/cm. The temperature of 60 ° C. There are three kinds of water, one water and two water. The anhydrate is a white crystalline powder which is slightly hygroscopic and highly soluble in water. Anhydrous is a colorless orthorhombic crystal, easily soluble in water, and the aqueous solution is acidic (pH=4.5), insoluble in alcohol, and slightly soluble in chloroform. Dihydrate is also very soluble in water, easy to agglomerate in humid air, dehydrated to anhydrous at 100 ° C, sodium pyrophosphate formed at 190-210 ° C, and decomposed into sodium metaphosphate at 280-300 ° C. The aqueous solutions are all acidic. At present, the product is mainly dihydrate. At a certain pH, it is prepared by reacting sodium carbonate with phosphoric acid or by reacting disodium hydrogen phosphate with a certain proportion of phosphoric acid, and is easy to agglomerate in humid air.

Uses: Used in boiler water treatment, electroplating, tanning, baking powder, fuel additives, detergents, mica and gelatin, acid retardant, etc. It is also the raw material for preparing sodium hexametaphosphate and polycondensate.

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