Table 7.

Experimental and Correlated Mole Fraction Solubility of WS·IPA (x₁) in the Binary Solvent Mixture of IPA (2) + Heptane (3) at Different Temperatures, T, and at Pressure, p = 101.3 kPa^a

		Apelblat		λh				Apelblat		λh
T/K	103 $x_1^{\text{exp}}$	103 $x_1^{\text{cal}}$	102 RD	103 $x_1^{\text{cal}}$	102 RD	T/K	103 $x_1^{\text{exp}}$	103 $x_1^{\text{cal}}$	102 RD	103 $x_1^{\text{cal}}$	102 RD
w3 = 0.091						w3 = 0.176
283.4	0.59	0.62	−4.95	0.64	−6.96	283.6	0.50	0.47	7.18	0.50	1.06
285.7	0.70	0.68	2.06	0.69	0.80	291.9	0.60	0.65	−7.91	0.66	−9.94
289.3	0.79	0.78	2.00	0.78	1.57	309.2	1.19	1.18	1.29	1.15	3.58
300.5	1.15	1.14	0.67	1.13	1.76	321.6	1.68	1.69	−0.06	1.66	1.42
311.7	1.60	1.61	−0.82	1.59	0.34	326.4	1.91	1.91	0.17	1.90	0.53
324.4	2.30	2.30	0.16	2.31	−0.35	331.5	2.16	2.17	−0.18	2.19	−1.50
w3 = 0.277						w3 = 0.372
287.2	0.50	0.50	0.62	0.49	2.41	282.7	0.27	0.28	−3.75	0.28	−4.69
296.9	0.64	0.65	−0.65	0.65	−0.74	293.2	0.41	0.40	3.52	0.40	3.39
313.7	1.01	1.01	−0.09	1.02	−1.01	317.3	0.81	0.82	−1.25	0.82	−0.77
323.0	1.30	1.29	0.32	1.30	−0.03	327.0	1.07	1.07	0.66	1.07	0.77
330.4	1.56	1.56	−0.13	1.56	0.33	331.8	1.21	1.21	−0.15	1.21	−0.39
w3 = 0.469
278.4	0.14	0.15	−2.63	0.15	−6.85
295.2	0.28	0.28	0.38	0.28	0.04
307.2	0.42	0.42	0.71	0.41	1.50
316.7	0.57	0.56	1.78	0.55	2.59
326.2	0.71	0.73	−3.97	0.73	−3.86
330.5	0.84	0.82	2.00	0.83	1.53

^aStandard uncertainty, u, is u(T) = 2 K. Relative standard uncertainties, u_r are u_r(p) = 0.1, u_r(x₁) = 0.01, and u_r(w₃) = 0.001. $x_1^{\exp }$ refers to the experimental mole fraction solubility . $x_1^{\text{cal}}$ refers to the calculated solubility data using the Apelblat and λh model equations. RD represents the corresponding relative deviation. w₃ is the mass fraction of heptane (3) in a binary IPA (2) + heptane (3) mixture.