Dilute aqueous solutions of unsymmetrical quaternary ammonium iodides. Part 1.—Viscosity and density measurements

Abstract

Viscosity and density measurements at 25°C on solutions of small straight-chain and cyclic quaternary ammonium iodides, and on methyl and ethyl pyridinium iodide are reported. The derived apparent molal volumes ϕ^°_ν and viscosity B-coefficients B_η change by constant amounts (0.015 dm³ mol^–1 and 0.067 dm³ mol^–1 respectively) per CH₂ group for all except the pyridinium salts, and are related by the equation B_η= 4.6 ϕ^°_ν–0.54.