Determination of Ion-Pair Formation Constants for MA+ Ions (M = Ca, Sr, Ba, Cu, Cd) with A- = Picrate Ion in Water by Picric Acid Extraction into Benzene
説明
Ion-pair formation constants ( K MA 0 ) for MA + = MPic + and MCl + in water were determined at 298 K and ionic strength → 0 by extraction experiments of picric acid (HPic) in the presence of M(II) in the water phase into benzene (Bz) and by potentiometry with a commercial Cl - -selective electrode, respectively. Here, M denotes Ca(II), Sr(II), Ba(II), Cu(II), and Cd(II). In adding Pb(II) data, a relation between K MA 0 values was K MCl 0 <K MPic 0 for a given M(II).For CdPic + , the K MA 0 value (= 136mol -1 dm 3 ) determined by the HPic extraction was somewhat larger than that (= 108) potentiometrically-determined before with a Cd 2+ -selective electrode, while for CaPic + the former value (= 89) equaled the latter one (= 88) determined before with a Ca 2+ -selective electrode.
収録刊行物
-
- Journal of Applied Solution Chemistry and Modeling
-
Journal of Applied Solution Chemistry and Modeling 5 71-75, 2016-05-31
Lifescience Global