Chemical Specifications Appearance Creamish brown colored powder Loss on drying (at 105°C) 5 - 12% Solubility Passes test Identification Passes test pH (2% w/v solution in water) 9 - 10.5 Arsenic (As) Max 0.0008% Sedimentation value Max 2 ml Swelling power Min 24 ml Coarse particles Max 0.1 gm remains on 200 no. sieve