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Molecular formula: KH2PO4

Molecular weight:   136.09

Properties: Colorless cubic crystal or white crystal powder. Relative density is 2.338, and melting point is 252.6 centigrade. It is soluble in water and insoluble in ethanol, and the aqueous solution shows acidity. It melts and becomes transparent liquid at 400 centigrade. After refrigerating, it becomes opaque potassium metaphosphate. It is easy to deliquesce.

Specification: (reference standard)

items	unit	standard
		technical grade	Low arsenic grade
KH2PO4	%≥	98.00	99.00
P2O5	%≥	51.20	51.60
K2O	%≥	34.00	34.00
pH(3% solution)	--	4.3--4.7
Chlorid (Cl-)	%≤	0.20	0.2
Fe	%≤	--	0.003
Fluorid (F)	%≤	--	0.001
As	%≤	--	0.0003
Heavy metal (Pb)	%≤	--	0.001
Water insolubles	%≤	0.20	0.10
Moisture	%≤	0.20	0.20

mono potassium phosphate MKP 98% min white crystal