Potassium dihydrogen phosphate
- CAS number
- 7778-77-0
- Molecular weight
- Molecular formula / chemical symbol
- KH2PO4
Description
Colorless crystals or white granular powder. Stable in the air, lost 400 ℃water into sodium metaphosphate. About 4.5 parts water soluble, and insoluble in ethanol. pH4.4 ~ 4.7. The relative density of 2.34. Melting point252.6 ℃.
Keywords: Phosphate
USES
Preparation buffer. Determination of arsenic, antimony, phosphorus, aluminum, and iron. Preparation of phosphorus standard solution. The preparation of the medium. Determination of inorganic phosphorus, serum alkaline phosphatase activity. This product should be kept under seal
Report
Quality standards GB 1274-93 GB 6353-86
0.025m mixed phosphate solution pH（S）Ⅱ（25℃）：pH（S）Ⅱ＝pH（S）Ⅰ±0.005
|
Item |
Analytical grade |
Chemically pure |
Capacity operating reference |
|
Content |
≥99.5% |
≥99.0% |
Not less than 99.5% |
|
pH (50g/ L solution, 25 ° C) |
4.2～4.5 |
4.2～4.5 |
/ |
|
Aqueous reaction |
/ |
/ |
Qualified |
|
Max impurities,%: |
|
|
|
|
Clarity Test |
Qualified |
Qualified |
Qualified |
|
Water insoluble matter |
≤0.002 |
≤0.005 |
≤0.002 |
|
Loss on drying |
≤0.2 |
≤0.3 |
≤0.2 |
|
Chloride (Cl) |
≤0.001 |
≤0.005 |
≤0.001 |
|
Sulfate (SO4) |
≤0.003 |
≤0.005 |
≤0.002 |
|
Nitrate (NO3) |
/ |
/ |
≤0.002 |
|
Sodium (Na) |
≤0.02 |
≤0.05 |
≤0.02 |
|
Iron (Fe) |
≤0.001 |
≤0.005 |
≤0.001 |
|
Heavy metals (as Pb) |
≤0.001 |
≤0.005 |
≤0.001 |
|
Arsenic (As) |
≤0.0005 |
≤0.002 |
≤0.0005 |
|
Total nitrogen amount (N) |
≤0.001 |
≤0.002 |
/ |
|
Ammonium salts (NH4) |
/ |
/ |
≤0.001 |
|
Ammonia precipitate |
/ |
/ |
≤0.005 |