Fig. 4

Plot of isentropic compressibility, \({\text{K}}_{\text{s}}\) vs square root of molality \({\text{m}}^{1/2}\) for (A) QUE in 30 v/v EtOH + 0.5 \({\text{mol kg}}^{-1}\) NAM, (B) QUE in 30 v/v EtOH + 1.0 \({\text{mol kg}}^{-1}\) NAM, (C) 7-HF in 30 v/v EtOH + 0.5 \({\text{mol kg}}^{-1}\) NAM and (D) 7-HF in 30 v/v EtOH + 1.0 \({\text{mol kg}}^{-1}\) NAM at T = 293.15, 298.15 and 303.15 K