Volumetric Properties in the NaAsO₂ + H₂O System at Temperature from 283.15 to 363.15 K and Atmospheric Pressure

Table 3

Apparent molar volumes and densities of the NaAsO₂ + H₂O system at various temperatures and molalities at 101 ± 5 kPa.^a

m(NaAsO2)	ρ	VΦ	ρ	VΦ	ρ	VΦ
Mol·kg^−1	g·cm^−3	cm^3·mol^−1	g·cm^−3	cm^3·mol^−1	g·cm^−3	cm^3·mol^−1
	T = 283.15 K		T = 288.15 K		T = 293.15 K
1.94236	1.54174	−96.8179	1.53826	−96.1708	1.53474	−95.6638
1.74671	1.47538	−96.6072	1.47215	−95.8962	1.46886	−95.3316
1.55298	1.41632	−97.7718	1.41333	−96.9925	1.41027	−96.3714
1.35720	1.35951	−99.5389	1.35679	−98.6871	1.35397	−98.0068
0.97105	1.25604	−106.8454	1.25389	−105.8578	1.25159	−105.0693
0.77617	1.20993	−116.6088	1.20801	−115.4939	1.20593	−114.6058
0.58372	1.16344	−129.5826	1.16181	−128.3595	1.15999	−127.3822
0.39237	1.12068	−159.3925	1.11935	−158.0320	1.11780	−156.9634
0.19570	1.07768	−249.5148	1.07670	−248.0568	1.07546	−246.9547
0.00000	0.99966	—	0.99908	—	0.99820	—
	T = 298.15 K		T = 303.15 K		T = 308.15 K
1.94236	1.53116	−95.2661	1.52752	−94.9783	1.52383	−94.7832
1.74671	1.46549	−94.8841	1.46207	−94.5577	1.45857	−94.3245
1.55298	1.40712	−95.8741	1.40390	−95.5091	1.40060	−95.2448
1.35720	1.35105	−97.4614	1.34805	−97.0548	1.34494	−96.7549
0.97105	1.24917	−104.4410	1.24663	−103.9809	1.24397	−103.6459
0.77617	1.20370	−113.8897	1.20132	−113.3462	1.19881	−112.9440
0.58372	1.15800	−126.5968	1.15584	−126.0085	1.15354	−125.5718
0.39237	1.11605	−156.0997	1.11412	−155.4848	1.11201	−155.0170
0.19570	1.07399	−246.0876	1.07230	−245.5014	1.07041	−245.0817
0.00000	0.99707	—	0.99569	—	0.99410	—
	T = 313.15 K		T = 318.15 K		T = 323.15 K
1.94236	1.52007	−94.6709	1.51626	−94.6424	1.51237	−94.6850
1.74671	1.45501	−94.1840	1.45137	−94.1289	1.44767	−94.1534
1.55298	1.39722	−95.0767	1.39376	−94.9992	1.39022	−95.0067
1.35720	1.34175	−96.5581	1.33847	−96.4597	1.33510	−96.4499
0.97105	1.24119	−103.4289	1.23831	−103.3333	1.23533	−103.3445
0.77617	1.19616	−112.6608	1.19340	−112.5145	1.19050	−112.4632
0.58372	1.15108	−125.2659	1.14848	−125.1021	1.14575	−125.0503
0.39237	1.10973	−154.6928	1.10731	−154.5528	1.10473	−154.5289
0.19570	1.06834	−244.8692	1.06609	−244.8135	1.06368	−244.9561
0.00000	0.99231	—	0.99033	—	0.98817	—
	T = 328.15 K		T = 333.15 K		T = 338.15 K
1.94236	1.50842	−94.7894	1.50439	−94.9561	1.50025	−95.1719
1.74671	1.44388	−94.2384	1.44001	−94.3908	1.43604	−94.5963
1.55298	1.38660	−95.0791	1.38289	−95.2211	1.37907	−95.4202
1.35720	1.33163	−96.5086	1.32807	−96.6411	1.32440	−96.8342
0.97105	1.23224	−103.4322	1.22904	−103.6081	1.22574	−103.8600
0.77617	1.18749	−112.4984	1.18436	−112.6244	1.18111	−112.8292
0.58372	1.14289	−125.0870	1.13990	−125.2217	1.13678	−125.4425
0.39237	1.10201	−154.5877	1.09916	−154.7787	1.09617	−155.0549
0.19570	1.06111	−245.1416	1.05840	−245.5166	1.05554	−245.9837
0.00000	0.98586	—	0.98339	—	0.98077	—
	T = 343.15 K		T = 348.15 K		T = 353.15 K
1.94236	1.49599	−95.4295	1.49156	−95.7097	1.48689	−95.9977
1.74671	1.43194	−94.8431	1.42768	−95.1155	1.42320	−95.3957
1.55298	1.37512	−95.6640	1.37102	−95.9411	1.36671	−96.2108
1.35720	1.32060	−97.0712	1.31666	−97.3367	1.31251	−97.6106
0.97105	1.22229	−104.1578	1.21869	−104.4757	1.21489	−104.7911
0.77617	1.17773	−113.0901	1.17420	−113.3740	1.17050	−113.6742
0.58372	1.13353	−125.7234	1.13013	−126.0281	1.12657	−126.3459
0.39237	1.09304	−155.3910	1.08978	−155.7837	1.08635	−156.1701
0.19570	1.05254	−246.5379	1.04940	−247.1269	1.04610	−247.7096
0.00000	0.97801	—	0.97512	—	0.97209	—
	T = 358.15 K		T = 363.15 K
1.94236	1.48185	−96.2392	1.47621	−96.3650
1.74671	1.41837	−95.6235	1.41299	−95.7264
1.55298	1.36208	−96.4328	1.35689	−96.4935
1.35720	1.30806	−97.8220	1.30308	−97.8506
0.97105	1.21081	−105.0049	1.20629	−104.9954
0.77617	1.16656	−113.8768	1.16227	−113.8641
0.58372	1.12278	−126.5346	1.11867	−126.4490
0.39237	1.08271	−156.3771	1.07877	−156.1936
0.19570	1.04262	−248.0259	1.03890	−247.7787
0.00000	0.96895	—	0.96570	—

^aStandard uncertainties u are u(T) = 0.01 K and u(p) = 5 kPa. u(m) for NaAsO₂ aqueous solution is 0.2 mmol·kg⁻¹, u(ρ) for ρ is 1.4 mg·cm⁻³, and u(V_Φ) for V_Φ is 0.0030 cm³·mol⁻¹.