Densities and partial molal volumes of sodium tetrafluoroborate aqueous solutions at 20°C

Densities of solutions of NaBF 4 in H 2 O have been determined at 20.00 °C over the concentration range 0.05 to 9.0 molal (0 to 50 wt%) NaBF 4 . The results are represented by d (g/mL, 20°C) = 9.726×10 5 m 3 - 3.2157×10 - 3 m 2 + 6.7447×10 - 2 m + 0.99843, where d is density and m is molality. This equation has been used to derive concentrative properties for NaBF 4 solutions. The raw density data have been used to derive partial molal volumes. The partial molal volume at infinite dilution is 37.6 ′ 2.7 mL/mol at 20°C. The partial molal volume at 20°C is represented by v 2 = 37.5 + 9.22m 1 / 2 - 2.92m from 0 to 2.5 m NaBF 4 and v 2 = 44.6 + 0.081m from 2.5 to 9 m NaBF 4 .