| Appearance | White or almost white, crystalline powder, colourless crystals or granules, efflorescent | Assay (by NaOH titration) | 99.5 -100.5% (on anhydrous substance) | 
                            
                                
	
                                | Solubility | Very soluble in water, freely soluble in ethanol (96 per cent) | Identifications | Passes BP test | 
                            
                                
	
                                | Appearance of solution | Passes BP test | Residue on ignition (at 800°C) | Max 0.02% | 
                            
                                
	
                                | Insoluble matter (13.2% in water) | Max 0.005% | Chloride (Cl) | Max 0.001% | 
                            
                                
	
                                | Oxalate (as C2H2O4) - as per ACS | Passes test | Oxalic acid | Max 0.036% | 
                            
                                
	
                                | Substance carbonizable by hot H2SO4 | Passes test | Lead (Pb) | Max 0.0002% |