Fourier transform ion cyclotron resonance spectrometry is used to determine reaction pathways and rate constants for the reactions of the Lewis acids, SiHnCl3-n+ (n = 1-3), with SiH3Cl. SiH2Cl+ is observed to participate in both an H- transfer reaction and a disproportionation reaction with SiH3Cl. The ions SiH3+ and SiHCl2+ are observed to participate in only H- transfer reactions with SiH3Cl. The H- affinity of SiH2Cl+ is determined to be 1.4 +/- 0.3 kcal mol(-1) greater than that of SiHCl2+. Within experimental uncertainty, the values of the H- affinities of the chlorosilyl ions Lie within 1.7 kcal mol-l of each other and decrease in the order SiH2Cl+ approximate to SiCl3+ > SiHCl2+. The disilylchloronium ion, (SiH3Cl+, is proposed to be an intermediate complex in the reaction of SiH3+ with SiH3Cl. Here, (SiH3Cl+ is formed through the reaction of protonated SiH3Cl with SiH3Cl. It is stable at room temperature at least on the order of tenths of seconds. By use of previously reported thermochemical data, the ionization potential of SiH2Cl and the hydride affinity of SH2Cl+ are derived to be 7.66 +/- 0.23 eV and 251.2 +/- 5.1 kcal mol(-1), respectively.