Proton coupling constants, J, and proton chemical shifts, δ(CH) and δ(CH₂), are reported for 1,1,2-trichloroethane in 32 protic and aprotic solvents, and in the gas phase. These have been analysed in terms of a conformational equilibrium between conformers I and II using multiple linear regression analysis through the Abraham–Kamlet–Taft equation. The main solvent influence on all three NMR parameters arises through reaction field effects as modelled by the Kamlet–Taft solvent dipolarity parameter π₁^x. There is a small effect of solvent hydrogen-bond basicity on δ(CH) but not on δ(CH₂) indicating that the CHCl₂ proton is slightly acidic. A similar effect of solvent basicity on the coupling constant J shows that not only is conformer II more dipolar than conformer I but that the CHCl₂ proton in II is more acidic than the CHCl₂ proton in I. The gas phase values of J,δ(CH) and δ(CH₂) are more comparable with a suggested value of –0.4 for π₁^x than with the directly measured value of –1.1 units.