paration of Silica Gel
10 g of rice husk ash were added to various
volumes and concentrations of sodium hydroxide
solution (most solutions were 2.0 M = 165 ml,
1.0 M = 330 ml, 0.5 M = 660 ml, because the
above solutions provide a minimum amount of
NaOH to produce sodium silicate with SiO2/Na2O
ratio = 1.0) in a thermo-resistant plastic container.