Table 9 Experimental and calculated densities \(\rho\) and viscosities \(\eta\) at T = 323.15 K for KCl (1) + CaCl₂ (2) + H₂O (3) system.

m₁ (mol kg⁻¹)	Experimental data		Calculated viscosity (mPa s)		Predicted density
m₁ (mol kg⁻¹)	\(\rho\) (g cm⁻³)	\(\eta\) (mPa s)	Equation (5)	Hu’s model	\(\rho\) (g cm⁻³)
			m₂ = 0.5
0.5	1.0507	0.6662	0.6551	0.6633	1.0542
1.0	1.0714	0.6771	0.6689	0.6754	1.0756
1.5	1.0902	0.6892	0.6828	0.6881	1.0956
2.0	1.1083	0.7004	0.6970	0.7010	1.1146
2.5	1.1297	0.7134	0.7116	0.7140	1.1324
3.0	1.1424	0.7284	0.7274	0.7275	1.1494
4.0	1.1583	0.7544	0.7430	0.7396	1.1653
			m₂ = 1.0
0.5	1.0907	0.7685	0.7648	0.7836	1.0917
1.0	1.1088	0.7825	0.7819	0.7968	1.1110
1.5	1.1273	0.7950	0.7989	0.8097	1.1290
2.0	1.1436	0.8099	0.8178	0.8238	1.1464
2.5	1.1601	0.8272	0.8344	0.8347	1.1622
3.0	1.1756	0.8434	0.8530	0.8462	1.1773
			m₂ = 1.5
0.5	1.1271	0.8906	0.8931	0.9176	1.1271
1.0	1.1445	0.9092	0.9138	0.9310	1.1444
1.5	1.1613	0.9217	0.9338	0.9430	1.1605
2.0	1.1772	0.9518	0.9550	0.9546	1.1758
2.5	1.1926	0.9603	0.9764	0.9646	1.1900
			m₂ = 2.0
0.5	1.1416	1.0246	1.0452	1.0715	1.1604
1.0	1.1788	1.0783	1.0690	1.0835	1.1758
1.5	1.1943	1.0826	1.0927	1.0934	1.1900
2.0	1.2095	1.1095	1.1188	1.1032	1.2035
			m₂ = 2.5
0.5	1.1968	1.2266	1.2261	1.2531	1.1920
1.0	1.2117	1.2549	1.2530	1.2611	1.2054
1.5	1.2267	1.2846	1.2803	1.2657	1.2178
			m₂ = 3.0
0.5	1.2283	1.4415	1.4437	1.4718	1.2223
1.0	1.2427	1.4802	1.4735	1.4699	1.2337
			m₂ = 3.5
0.5	1.2578	1.7161	1.7070	1.7327	1.2516
1.0	1.2720	1.7557	1.7407	1.7092	1.2609
			m₂ = 4.0
0.5	1.2868	2.0785	2.0306	2.0326	1.2802
			AAD% = 0.79	AAD% = 1.31	AAD% = 0.40
			SD = 0.0124	SD = 0.0199	SD = 0.0056

The standard uncertainties (u) are u(T) = 0.02 K, u(m) = 1.0 × 10⁻⁴ mol kg⁻¹. The combined expanded uncertainty (U_c) are U_c(ρ) = 5.0 × 10⁻⁵ g cm⁻³ (0.95 level of confidence) and U_c(\(\eta\)) = 0.003 mPa s (0.95 level of confidence).

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