Acid-Base Properties of Concentrated Electrolyte Solutions
Some metal salts are very soluble in water and it is possible to obtain solutions where the salt : water ratio is, for example, 1 : 6 or 1 : 4 or even lower. Indeed, it is sometimes possible to obtain such solutions simply by heating the solid salt hydrate, for example, CaCl2·6H20 melts to a clear liquid at 29.9°C. Some of these solutions possess remarkable chemical properties on account of their high acidity,1–3 and it has been argued by the present authors3 that this acidity can be predicted on the basis of calculations using the “optical basicity” approach. In this chapter we shall discuss in more detail why it is that concentrated salt solutions should exhibit acidic properties and attempt to interpret their behavior in the wider context of strong protonic acids.
KeywordsZinc Hydrolysis Phosphorus Hydrate Enthalpy
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