Physical and chemical properties: white powder or crystal. The relative density is 2.534, the melting point is 880鈩? and the boiling point is 938鈩? Colorless transparent crystal or white crystalline powder. It is easily soluble in water, the solubility in 100 grams of water at 20掳C is 6.23, and the aqueous solution is alkaline; it is insoluble in alcohol. The aqueous solution is still stable below 70 掳 C, and hydrolyzed into disodium hydrogen phosphate when boiled. Weathering in dry air, it loses crystal water at 100掳C.
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