Figure 4. Observedvs. calculated values (a) and distribution of the residual (b) of density
314 ionic liquids can be divided into 13 types cations and 25 types anions. Figure 5 analyzes AARD and the ρ data points of each type of ILs. It can be seen that the predicted AARD values of [Am][RSO4] and [Dbu][RSO3] are relatively large, which may lead to inaccurate prediction results for this two types ILs. However, most of the data point errors are within the acceptable range. Therefore, this model can be used to predict the density of ILs with different structures under different temperatures and pressures.