Properties: White crystal or powder, density (25ºC) 2.476g/mL, melting point 627.6℃, non-toxic, soluble in water, insoluble in alcohol, without buffer and chelation.

Properties: White powder or fine particles, easily soluble in water, and its aqueous solution is alkaline.

Properties: white powder, granular or flake, specific gravity 2.484 (20°C), melting point 616°C (decomposition), easily soluble in water, insoluble in organic solvents, highly hygroscopic, gradually absorbs water in the air and becomes viscose, can be It is a good water softener by compounding with alkaline earth metal to synthesize soluble double salt.

Properties: Appearance is white or colorless granular crystals, easily weathered, soluble in water, insoluble in organic solvents, the aqueous solution is alkaline reaction, the pH value of 1% aqueous solution is 12.1, the relative density is 1.62, the melting point is 73.4 ° C, the dodecahydrate is heated When heated to 55~65℃, it becomes decahydrate; when heated to 65~100℃, it becomes hexahydrate; when heated to 100~213℃, it becomes hemihydrate; when heated to above 212℃, it becomes anhydrous.

Properties: Dodecahydrate is a white crystal with a relative density of 1.52, easy to weather, melts at 35°C and loses 5 crystal waters, becomes anhydrous at 100°C, and sodium pyrophosphate at 250°C; anhydrous is white Powder, easy to deliquescence; both are easily soluble in water, the aqueous solution is weakly alkaline, insoluble in alcohol.

Properties: Dipotassium hydrogen phosphate trihydrate is a white crystal with water. Anhydrous is white powder. Easily soluble in water, the aqueous solution is slightly alkaline, slightly soluble in alcohol, hygroscopic, and self-dissolving at high temperature. Anhydrous dipotassium hydrogen phosphate is converted into potassium pyrophosphate when heated to 204°C.

Appearance: White granular crystal, relative density 1.619, melting point 155℃, easily soluble in water, insoluble in alcohol, PH value of 1% aqueous solution is 8.0, gradually loses ammonia in the air to form ammonium dihydrogen phosphate.

Properties: Anhydrous sodium dihydrogen phosphate is a white powder with a melting point of 190°C. The dihydrate is a white granular crystal with a relative density of 1.915 and a melting point of 57.40°C; both are easily soluble in water, insoluble in organic solvents, and absorb moisture in the air.

Properties: Colorless transparent crystal, stable in air, soluble in water (22.6g/100ml), insoluble in ethanol, deliquescence. When heated to 400 ℃, it melts into a transparent liquid, and after cooling, it solidifies into an opaque glassy potassium metaphosphate.

Properties: White granular crystal, relative density 1.803, melting point 190℃, easily soluble in water, slightly soluble in alcohol, insoluble in ketone, PH value of 1% aqueous solution is 4.5.

Properties: white powder, easily soluble in water, insoluble in alcohol, relative density 2.45, melting point 890 ℃, aqueous solution is weakly alkaline, easy to deliquescence in air, aqueous solution is stable at 70 ℃, hydrolyzed to disodium hydrogen phosphate when boiled .

Properties: Anhydrous potassium pyrophosphate is a white powder with a relative density of 2.534 and a melting point of 1109°C. It is easily hygroscopic and deliquescent. It is easily soluble in water and insoluble in ethanol. At 25°C, it dissolves 187 grams in 100 grams of water. Chelation.