Studies on the Anionic Species of Sodium Aluminate Solutions

Raman, UV, IR and NMR spectra, activity measurement and quantum chemical calculation methods are used concurrently to study the anionic species of sodium aluminate solutions. It has been found that sodium aluminate solutions with the same composition but different preparative histories may exhibit quite different optical andNMg spectra.Sodium aluminate solutions contain a series of aluminium-containing anions including Al(OH)_4~-,Al(OH)_6~(3-) and [(HO)_3Al-O-Al(OH)_3]~(2-).They may convert into each other but the reactions may be rather slow,so that solutions with the same composition but different preparative histories may have different ratios between various anions, and exhibit different spectroscopic properties.     

硫酸铟水溶液热力学

在HCl-In2(SO4)3-H2O体系中,溶液表观总离子强度恒定为I=0.2、0.4、0.6、0.8、1.0、1.5 mol•kg－1,硫酸铟在溶液中的表观离子强度分数恒定为yB=0、0.10、0.20、0.30、0.50和0 .70条件下,应用电动势方法测定无液体接界电池(A)在278.15～318.15 K温度范围内的电动势Pt, H2(101.325 kPa)│HCl(mA),In2(SO4)3(mB),H2O│AgCl-Ag (A) 根据测得电池(A)的电动势数据,考虑到该体系存在硫酸的二级解离,应用数学迭代方法确定平衡体系氢离子的浓度,进而确定了混合溶液中HCl 的活度系数γA .