calculation from literature values with standard SSA and SSD at ionic strength of 1M, log K for Aerosil in brackets for Cabosil content »Si-O<1-> + Cs<1+> = »Si-O-Cs logK = 2.3(2.0) »Si-OH = »Si-O<1-> + H<1+> pK2 = -logK = 7.0 sum »Si-OH + Cs<1+> = »Si-O-Cs + H<1+> logK= 2.3(2.0) -7 = -4.7(-5.0)