Product name: Potassium hydrogen phthalate
ID:B30
CAS No.:877-24-7
Molecular formula: C6H4(COOK)COOH
Purity: 99.8%min
Property: Colorless crystal or white crystalline powder, soluble in water, slightly soluble in ethyl alcohol, density is 1.636, melting point: 295-300℃.
Molecular weight: 204.22
Use: Standard reagent for the preparation of standard alkali solution, and buffer agent for measuring PH value.
Technical index |
Item | Standard value% |
Content | ≥99.5-100.00 |
PH(50g/L solution,25℃) | 3.8-4.1 |
Clarity test | Qualified |
Water insoluble matter | ≤0.003 |
Chloride (Cl) | ≤0.002 |
Sulfur compound (in SO4) | ≤0.006 |
Iron (Fe) | ≤0.0005 |
Sodium (Na) | ≤0.005 |
Heavy metal (in Pb) | ≤0.0005 |
Drying loss | ≤0.05 |
Ammonium compound (NH4) | ≤0.005 |