Table 5 Experimental and calculated densities \(\rho\) and viscosities \(\eta\) at T = 303.15 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	1.0601	0.9490	0.9283	0.9204	1.0601
1.0	1.0800	0.9466	0.9378	0.9299	1.0797
1.5	1.0993	0.9576	0.9491	0.9411	1.0985
2.0	1.1176	0.9710	0.9619	0.9531	1.1165
2.5	1.1393	0.9752	0.9765	0.9664	1.1339
3.0	1.1521	0.9880	0.9935	0.9820	1.1508
3.5	1.1681	1.0089	1.0105	0.9978	1.1669
			m₂ = 1.0
0.5	1.0998	1.0868	1.0763	1.0783	1.0989
1.0	1.1172	1.0875	1.0916	1.0920	1.1172
1.5	1.1367	1.0943	1.1083	1.1064	1.1349
2.0	1.1533	1.1129	1.1289	1.1247	1.1523
2.5	1.1699	1.1420	1.1474	1.1410	1.1684
3.0	1.1857	1.1505	1.1694	1.1616	1.1845
			m₂ = 1.5
0.5	1.1366	1.2637	1.2534	1.2622	1.1361
1.0	1.1539	1.2738	1.2747	1.2801	1.1535
1.5	1.1711	1.2823	1.2967	1.2994	1.1702
2.0	1.1871	1.3095	1.3217	1.3227	1.1866
2.5	1.2028	1.3256	1.3479	1.3488	1.2025
			m₂ = 2.0
0.5	1.1727	1.4665	1.4679	1.4739	1.1721
1.0	1.1887	1.5057	1.4946	1.4998	1.1886
1.5	1.2045	1.5133	1.5228	1.5292	1.2047
2.0	1.2200	1.5328	1.5559	1.5659	1.2207
			m₂ = 2.5
0.5	1.2069	1.7343	1.7285	1.7290	1.2064
1.0	1.2221	1.7514	1.7607	1.7683	1.2223
1.5	1.2372	1.8023	1.7951	1.8131	1.2380
			m₂ = 3.0
0.5	1.2389	2.0640	2.0491	2.0516	1.2391
1.0	1.2534	2.0813	2.0865	2.1094	1.2547
			m₂ = 3.5
0.5	1.2687	2.4762	2.4454	2.4653	1.2700
1.0	1.2832	2.5279	2.4894	2.5482	1.2858
			m₂ = 4.0
0.5	1.2982	3.0180	2.9431	2.9970	1.2996
			AAD% = 0.90	AAD% = 0.99	AAD% = 0.120
			SD = 0.0202	SD = 0.0155	SD = 0.0018

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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