Table 6 Experimental and calculated densities \(\rho\) and viscosities \(\eta\) at T = 308.15 K for KCl (1) + CaCl₂ (2) + H₂O (3) system.

m₁ (mol kg⁻¹)	Experimental data		Calculated viscosity (mPa s)		Predicted viscosity
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	1.0582	0.8696	0.8427	0.8491	1.0587
1.0	1.0778	0.8657	0.8511	0.8572	1.0785
1.5	1.0972	0.8764	0.8604	0.8672	1.0972
2.0	1.1155	0.8835	0.8706	0.8783	1.1150
2.5	1.1370	0.8957	0.8821	0.8905	1.1322
3.0	1.1498	0.9097	0.8957	0.9043	1.1488
3.5	1.1658	0.9305	0.9099	0.9174	1.1649
			m₂ = 1.0
0.5	1.0977	0.9649	0.9809	0.9900	1.0976
1.0	1.1149	0.9927	0.9919	1.0017	1.1155
1.5	1.1345	1.0043	1.0034	1.0141	1.1328
2.0	1.1510	1.0214	1.0180	1.0293	1.1499
2.5	1.1676	1.0244	1.0305	1.0416	1.1662
3.0	1.1833	1.0579	1.0462	1.0560	1.1825
			m₂ = 1.5
0.5	1.1344	1.1488	1.1478	1.1534	1.1329
1.0	1.1515	1.1630	1.1616	1.1686	1.1502
1.5	1.1687	1.1766	1.1754	1.1835	1.1671
2.0	1.1847	1.2012	1.1914	1.1996	1.1841
2.5	1.2003	1.2145	1.2082	1.2154	1.2010
			m₂ = 2.0
0.5	1.1705	1.3391	1.3510	1.3514	1.1675
1.0	1.1864	1.3776	1.3672	1.3695	1.1849
1.5	1.2020	1.3752	1.3840	1.3870	1.2023
2.0	1.2174	1.4078	1.4048	1.4071	1.2203
			m₂ = 2.5
0.5	1.2044	1.5783	1.5983	1.5957	1.2021
1.0	1.2195	1.6039	1.6169	1.6157	1.2203
1.5	1.2346	1.6433	1.6367	1.6349	1.2388
			m₂ = 3.0
0.5	1.2363	1.8760	1.9020	1.8999	1.2369
1.0	1.2508	1.8966	1.9226	1.9194	1.2562
			m₂ = 3.5
0.5	1.2660	2.2371	2.2751	2.2743	1.2708
1.0	1.2805	2.3077	2.2991	2.2911	1.2920
			m₂ = 4.0
0.5	1.2954	2.7386	2.7390	2.7300	1.3033
			AAD% = 0.9558	AAD% = 0.87	AAD% = 0.18
			SD = 0.0151	SD = 0.0139	SD = 0.0031

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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