Abstract
Molal freezing point depression (ΔT o f of N-methylformamide (NMF), N-methylacetamide (NMA), N,N-dimethylformamide (DMF) and N,N-dimethylacetamide (DMA) have been determined in benzene by cryoscopic measurements. From these results, molecular weight, degree of association and equilibrium constant have been evaluated. The observed deviations from linear behaviour in ΔT o f versus concentration plots appear to indicate the existence of Monomer ⇄ Dimer equilibrium almost at all concentrations for NMF and NMA as compared to the normal linear feature for DMF and DMA, a novelty explained in terms of hydrogen bonding and supports our previous conclusions [1] drawn from dielectric measurements.
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