Table 9.

Experimental and Correlated Mole Fraction Solubility of WS·IPA (x₁) in the Ternary Solvent Mixture of IPA (2) + Acetone (3) with w₃ = 0.095 + Heptane (4) 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
w4 = 0.088						w4 = 0.179
281.1	1.43	1.44	−0.85	1.46	−1.95	282.3	1.10	1.12	−1.63	1.15	−4.17
284.5	1.61	1.58	1.62	1.59	1.01	284.7	1.21	1.20	0.35	1.22	−1.24
289.4	1.79	1.80	−0.49	1.80	−0.55	290.5	1.44	1.41	1.73	1.41	1.82
299.3	2.29	2.31	−0.81	2.30	−0.23	297.0	1.67	1.67	0.22	1.65	1.43
306.0	2.72	2.71	0.46	2.69	1.10	302.9	1.90	1.92	−1.08	1.89	0.49
313.2	3.19	3.18	0.12	3.17	0.48	312.5	2.38	2.38	0.20	2.35	1.05
322.2	3.85	3.85	−0.08	3.87	−0.56	321.1	2.82	2.82	0.03	2.85	−1.02
w4 = 0.274						w4 = 0.374
280.8	0.79	0.80	−1.50	0.80	−1.44	284.6	0.60	0.60	−0.70	0.59	2.32
285.6	0.89	0.89	0.06	0.89	0.05	298.2	0.81	0.79	1.60	0.80	0.63
291.2	1.02	1.01	1.21	1.01	1.16	306.7	0.94	0.95	−1.43	0.97	−2.88
301.7	1.28	1.26	1.45	1.26	1.43	312.4	1.09	1.08	1.04	1.09	0.08
312.6	1.54	1.57	−2.54	1.57	−2.51	319.3	1.24	1.27	−1.88	1.26	−1.57
318.4	1.78	1.77	0.78	1.77	0.79	321.6	1.35	1.34	1.24	1.32	2.10
321.3	1.88	1.87	0.29	1.87	0.27
w4 = 0.471
281.2	0.36	0.36	0.98	0.37	−0.97
286.6	0.40	0.41	−2.24	0.42	−2.88
293.2	0.49	0.48	2.11	0.48	2.58
300.9	0.57	0.58	−1.37	0.57	−0.26
310.5	0.71	0.70	0.51	0.70	1.40
321.9	0.87	0.88	−0.09	0.88	−0.79

^aStandard uncertainty, u, is u(T) = 2 K. Relative standard uncertainties, u_r are u_r(p) = 0.1, u_r(x₁) = 0.01, u_r(w₃) = 0.001, and u_r(w₄) = 0.003. $x_1^{\text{exp}}$ 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 acetone (3) in binary IPA (2) + acetone (3) mixture. w₄ is the mass fraction of heptane (4) in ternary IPA (2) + acetone (3) + heptane (4) mixture.