Silica Gel  G

Silica Gel  G (112926-00-8)

A fine, white, homogeneous powder of an average particle size of about 15  µm containing about 13% of calcium sulphate hemihydrate and complying with the following requirements.

Content of calcium sulphate To 0.25  g add 3  ml of 2m hydrochloric acid and 100  ml of water and shake vigorously for 30 minutes. Filter, wash the residue with water and carry out the complexometric titration of calcium , Appendix VIII D, on the combined filtrate and washings. Each  ml of 0.1m disodium edetate VS is equivalent to 14.51  mg of CaSO₄,½H₂O.

Acidity or alkalinity pH of a suspension prepared by shaking 1  g with 10  ml of carbon dioxide-free water for 5 minutes, about 7, Appendix V L.