AppearanceWhite crystalline powderAssay (acidimetric)98.5 - 101.0%pH (5% solution)5.5 - 8.5IdentityPasses testAppearance of solutionPasses testAcidity or alkalinityPasses testChloride (Cl)Max 0.004%Heavy metal (as Pb)Max 0.002%Iron (Fe)Max 0.001%Magnesium (Mg)Max 0.002%Calcium (Ca)Max 0.02%Sodium (Na)Max 0.1%Loss on drying (at 105°C)Max 1.0%