<p>The protonation for several classes of weak bases has been studied by n.m.r. techniques and the structure of the conjugate acids determined. The rates of proton transfer and the activation energies for some of the processes have been calculated and in the cases of the methylbenzene-HSO₃F systems the mechanism of the proton transfer process has been elucidated.</p> <p>The acidity function (H₀) for the HSO₃F/SbF₅ system has been redetermined and extended to higher concentrations of SbF₅• The application of some n.m.r. methods to the measurement of H₀ is discussed.</p> <p>The behaviour of the n.m.r. spectra of sulphuric and fluorosulphuric acids upon the addition of electrolytes has been studied and the results interpreted.</p> / Thesis / Doctor of Philosophy (PhD)