Appearance: White or almost white powder, hygroscopic. Solubility: Practically insoluble in anhydrous ethanol. It swells with water to form a suspension and becomes viscid in 1 M sodium hydroxide.
IDENTIFICATION
A. pH 3.5 to 5.0.
Suspend 1.0 g in 100 mL of water R.
B. Infrared absorption spectrophotometry
TESTS
Chlorides: Maximum 0.36 per cent. Sulfates: Maximum 0.72 per cent. Heavy metals: Maximum 20 ppm. Loss on drying: Maximum 8.0 per cent, determined on 1.000 g by drying in an oven at 10C for 4 h. Sulfated ash: Maximum 1.5 per cent, determined on 1.0 g.
