Physical and chemical properties: Magnesium hydrogen phosphate, chemical formula MgHPO4·3H2O. Molecular weight 174.34. White orthorhombic crystals. The relative density is 2.12315. When heated to 205 ° C, 1 molecule of water is lost, and 550 ~ 650 ° C is decomposed. The heptahydrate is a white acicular crystal with a relative density of 1.72815 and loses 4 molecules of water at 100℃. Slightly soluble in cold water, soluble in acid, insoluble in alcohol. Magnesium hydrogen phosphate can be obtained by mixing magnesium acetate solution and ammonium phosphate solution at a pH of 4, placing it for one day and night, or mixing the solution obtained from two parts magnesium sulfate dissolved in 32 parts of water with three parts anhydrous disodium phosphate dissolved in 32 parts of water, and reacting at a temperature above 36℃ for 24 hours. Used as plastic stabilizer and food additive.
Chemical properties: white crystalline powder. No odor. The relative density is 2.13. A crystal water is lost at 205 ° C. When heated (550 ~ 650℃), it can be decomposed into pyrophosphate. Soluble in dilute acid, slightly soluble in water, insoluble in alcohol.
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