The density and viscosity of formic acid + 2-alkanol systems at various temperatures (293.15 to 323.15 K) were determined in this work. The excess molar volumeVmE and deviation in the viscosity Δη for the four fluids of formic acid with 2- propanol up to 2-hexanol were calculated. For the binary solutions of formic acid with 2-propanol and 2-butanol, negative VmE was obtained. Other binary mixtures showed positive excess molar volumes. Deviations in the viscosity were positive for the formic acid + 2-propanol and 2-butanol mixtures and negative for the remaining solutions. The findings show that in solutions containing shorter alcohols, intermolecular forces are stronger, while in longer 2-alkanols, mixtures are more affected by physical interactions. Dipole−dipole interactions, structural accommodations, and steric hindrances are responsible for the observed effects. Moreover, the reliability of the PC-SAFT to model the excess molar volume and density of mixtures was tested. No report for the viscosity and density of the above mixtures is available in the scientific papers
