POTASSIUM DIHYDROGEN PHOSPHATE
1.Basic Information
Alias : Potassium phosphate
Molecular formula: KH2PO4
Molecular weight : 136.09
CAS No. : 7778-77-0H.S. Code : 2835240000
EINECS : 231-913-4
2. Physicochemical Properties
Appearance : White powder.
Relative density : 2.238 g/cm3
Melting point : 257.6oC
Boiling point : 158oC at 760 mm Hg
Solubility : Soluble in water. 22.6g/100ml
Attributes : It is deliquescent. It melts into transparent liquid when heated to 400oC, and solidifies into opaque glassy potassium metaphosphate after cooling. Stable in air, soluble in water, insoluble in ethanol.
3. Application
In industry, it is not only used as buffer and culture agent, but also used as flavoring agent for bacterial culture agent synthesis, raw material for preparing potassium metaphosphate, culture agent, enhancer, leavening agent and fermentation assistant for brewing yeast. In agriculture, it is used as a high-efficiency phosphorus and potassium compound fertilizer.
Molecular formula: KH2PO4
CAS: 7778-77-0
Appearance: colorless crystal
Properties:
Colorless to white crystalls or crystal powder, odourless. Relative density 2.338. Soluble in water, insoluble in ethanol. Acidic aqueous solution, 2.7% of the aqueous solution PH 4.2 4.7. Stability in the air. ADI0-70 mg/kg (FAO/WHO, 1994).
Use:
Used as chromatographic analysis reagent and buffer, also used in pharmaceutical synthesis.
Used in the manufacture of baking, in the food industry as a leavening agent, flavouring agent, fermentation
additives, nutrition enhancer, yeast food. Also used as a buffering agent, chelating agent.
Used as a fertilizer, seasoning, brewing yeast culture agent, was used to prepare buffer solution, also used in medicine and the manufacturing potassium metaphosphate.
4. Technical Standard (HGT4511-2013) |
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Product Name | MKP | CAS No. | 7778-77-0 |
Specification | GB 25560-2010 | Result |
Assay(KH2PO4)(as dry basis), w/% ≥ | 98 | 99.1 |
Water insolution, w/% ≤ | 0.2 | 0.2 |
Ar senic(as As)/(mg/kg) ≤ | 3 | - |
Heavy metal(as Pb)/(mg/kg) ≤ | 10 | 10 |
Lead(as Pb)/(mg/kg) ≤ | 2 | 2 |
Fluoride(as F)/(mg/kg) ≤ | 10 | 10 |
pH value(10g/L solution) | 4.2-4.7 | 4.4 |
Loss on drying, w/% ≤ | 1.0 | 0.2 |