Table 8. Solubilities of Solutions in the Quaternary System NaCl–Na₂CO₃–NaOH–H₂O at T = 363.15 K and P = 88.94 kPa^a.

	liquid mass %				dry salt (liquid) mass %
no.	NaOH	Na2CO3	NaCl	H2O	NaOH	Na2CO3	NaCl	H2O mass (g/100 g dry salt)	solution density ρ/g·cm–3	equilibrium phase solidsb
1	0.00	0.00	27.80	72.20	0.00	0.00	100.00	259.71	1.1723	Cl
2	68.87	0.00	2.87	28.26	96.00	0.00	4.00	39.39	1.5831	Cl + OH
3	76.28	0.00	0.00	23.72	100.00	0.00	0.00	31.10	1.5884	OH
4	48.79	0.55	0.00	50.66	98.88	1.12	0.00	102.68	1.4696	OH + C
5(E1)	51.00	2.05	4.01	42.94	89.38	3.59	7.03	75.26	1.5215	C + OH + Cl
6	36.51	1.95	3.64	57.90	86.72	4.64	8.64	137.52	1.3868	C + Cl
7(E2)	34.21	1.69	4.34	59.76	85.02	4.20	10.78	148.51	1.3680	C + C1 + Cl
8	17.14	10.99	0.00	71.87	60.93	39.07	0.00	255.49	1.2339	C + C1
9	0.00	30.50	0.00	69.50	0.00	100.00	0.00	227.87	1.3112	C1
10	0.00	9.97	21.09	68.94	0.00	32.10	67.90	221.96	1.2031	C1 + Cl
11	8.65	3.17	15.54	72.64	31.61	11.57	56.82	265.62	1.2084	C1 + Cl
12	16.42	2.57	10.71	70.30	55.28	8.67	36.05	236.73	1.2453	C1 + Cl
13	28.46	3.15	9.47	58.92	69.29	7.65	23.06	143.42	1.3418	C1 + Cl
14	24.67	1.58	7.14	66.61	73.88	4.73	21.39	199.44	1.2940	C1 + Cl
15	30.11	1.65	4.6	63.64	82.81	4.54	12.65	175.06	1.3286	C1 + Cl

^aStandard uncertainties u are u(T) = 0.1 K, u(P) = 0.5 kPa, and u_r(Na₂CO₃) = u_r(NaCl) = u_r(NaOH) = 0.05.

^bAbbreviations: OH, NaOH; Cl, NaCl; C, Na₂CO₃; and C₁, Na₂CO₃·H₂O.