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-> +TMA<1+> = »Si-O-TMA logK = 3.4(3.4) »Si-OH = »Si-O<1-> + H<1+> pK2 = -logK = 7.0 sum »Si-OH + TMA<1+> = »Si-O-TMA + H<1+> logK= 3.4(3.4) -7 = -3.6(-3.6)