Citric Acid AR500g
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1 CAS No.5949-29-1
2 EC No. 200-662-2
3 crystalline white solid
4 Purity 99.5%min
5 Packing: AR500g/bottle
a Properties
| Molecular formula | C6H8O7 |
| Molar mass | 192.124 g/mol (anhydrous) 210.14 g/mol (monohydrate) |
| Appearance | crystalline white solid |
| Density | 1.665 g/cm3(1.5g/cm3 for monohydrate) |
| Melting point | 153 °C, 426 K, 307 °F |
| Boiling point | 175 °C, 448 K, 347 °F (decomposes) |
| Solubility in water | 73 g/100 ml (20 °C) |
| Acidity (pKa) | pKa1 = 3.09 pKa2 = 4.75 pKa3 = 6.41 [1] |
| Main hazards | skin and eye irritant |
Specifications
Test item | Specification | |
Reagent grade | Pharmaceutical grade | |
Appearance | Conform | Conform |
Assay [C6H8O7] /% | ≥99.8 | ≥99.0 |
Clarify degrees test | Conform | Conform |
Water insoluble/% | ≤0.005 | ≤0.01 |
Burning residua (SO4) /% | ≤0.02 | ≤0.07 |
Chloride (Cl) /% | ≤0.0005 | ≤0.005 |
Sulfate (SO4)/% | ≤0.005 | ≤0.02 |
Phosphate (PO4)/% | ≤0.001 | ≤0.005 |
Oxalic acid salt (C2O4)/% | ≤0.05 |
|
Calcium (Ca) /% | ≤0.005 | ≤0.02 |
Ferric (Fe) /% | ≤0.0005 | ≤0.001 |
Copper (Cu) /% | ≤0.0005 |
|
Lead (Pb) /% | ≤0.0005 | ≤0.001 |
Easy carbonized material | Conform |
|
Application
Citric acid is used as a successful alternative to nitric acid in passivation of stainless steel.Citric acid was the first successful eluant used for total ion-exchange separation of the lanthanides, during the Manhattan Project in the 1940s. In the 1950s, it was replaced by the far more efficient EDTA.Citric acid can be used to slow setting of Portland cement. It can delay setting time substantially.
