Table 7 Experimental and calculated densities \(\rho\) and viscosities \(\eta\) at T = 313.15 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	1.0561	0.7879	0.7713	0.7675	1.0561
1.0	1.0756	0.7920	0.7836	0.7793	1.0757
1.5	1.0950	0.8051	0.7966	0.7922	1.0945
2.0	1.1132	0.8145	0.8102	0.8059	1.1124
2.5	1.1347	0.8270	0.8248	0.8206	1.1296
3.0	1.1474	0.8396	0.8412	0.8372	1.1461
3.5	1.1634	0.8634	0.8576	0.8540	1.1617
			m₂ = 1.0
0.5	1.0953	0.9059	0.8970	0.8997	1.0947
1.0	1.1125	0.9108	0.9137	0.9148	1.1128
1.5	1.1322	0.9237	0.9306	0.9306	1.1300
2.0	1.1486	0.9410	0.9501	0.9497	1.1467
2.5	1.1652	0.9698	0.9675	0.9672	1.1620
3.0	1.1808	0.9797	0.9876	0.9883	1.1769
			m₂ = 1.5
0.5	1.1321	1.0509	1.0458	1.0513	1.1305
1.0	1.1492	1.0659	1.0669	1.0707	1.1471
1.5	1.1663	1.0809	1.0879	1.0914	1.1627
2.0	1.1823	1.1011	1.1105	1.1154	1.1777
2.5	1.1978	1.1173	1.1338	1.1417	1.1917
			m₂ = 2.0
0.5	1.1681	1.2273	1.2245	1.2279	1.1643
1.0	1.1839	1.2598	1.2497	1.2547	1.1793
1.5	1.1995	1.2684	1.2752	1.2844	1.1934
2.0	1.2148	1.2979	1.3041	1.3201	1.2069
			m₂ = 2.5
0.5	1.2019	1.4444	1.4400	1.4417	1.1963
1.0	1.2170	1.4731	1.4693	1.4800	1.2097
1.5	1.2320	1.4963	1.4995	1.5227	1.2222
			m₂ = 3.0
0.5	1.2337	1.7043	1.7032	1.7100	1.2271
1.0	1.2481	1.7345	1.7363	1.7635	1.2387
			m₂ = 3.5
0.5	1.2633	2.0334	2.0254	2.0485	1.2569
1.0	1.2777	2.0810	2.0634	2.1225	1.2668
			m₂ = 4.0
0.5	1.2925	2.4705	2.4250	2.4753	1.2861
			AAD% = 0.78	AAD% = 1.04	AAD% = 0.34
			SD = 0.0127	SD = 0.0154	SD = 0.0047

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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