Distribution of alkaline metal ions with respect to hydration power in aqueous solutions

✍ Scribed by N.B. Zolotoy; G.V. Karpov

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 221 KB
• Volume: 232
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(94)01326-q

✦ Synopsis

A hypothesis on the binomial distribution of ions with respect to solvation has been advanced and tested by the mass spectrometric method of field evaporation of ions out of solution for ions of alkaline metals in aqueous solutions. The experimental distributions are described well by the binomial (Pt +qt )k~ where Pl is the probability of potential well occupation by a water molecule, ql = 1 -pt and k~ is the capacity of the first hydration shell. Values ofpt, kt and h (h is the number of water molecules in ion clusters corresponding to the maximum of the distribution; it is treated as the hydration number of the ion) are pl ~ 0.45, kl~ 13, h=5 (Li+);pl=0.32, k~= 12, h=4 (Na+);p~=0.35, kt=9, h=3 (K+);pt ~0.29, k1~8, h=2 (Cs+).