Acids and bases Table

Identify common strong acids and bases (Table J.l). 

In the last two sections we have described several different categories of strong and weak acids and bases. Table 17-5 summarizes the characteristics of these species. 

As was pointed out in the previous chapter, biologically important metal ions and their ligands can be classified according to the hard-soft theory of acids and bases (Table 2.1). While there are exceptions, most metal ions bind to donor ligands as a function of preferences based on this concept, with hard acids (metal ions) binding preferentially to hard bases (ligands) and soft acids to soft bases. 

The two theories that you have considered in this section attempt to explain the chemical nature of acids and bases. Table 10.3 summarizes the key points of these theories. 

For minerals with diffuse-kinetic dissolution regime is typical drastic increase in the reaction rate with increasing solution acidity. As a result they, as a regular rule, have diffuse regime at low pH values and kinetic one at high pH values. Such dissolution regime is featured, mostly, poorly soluble salts of weak acids and bases (Table 2.20). 

Phenolic resins are resistant to weak acids, weak alkalis, alcohols, esters, ketones, ethers, chlorinated hydrocarbons, benzene, mineral oils, animal and vegetable oils, and fats. Depending on the type of phenol resin, they are not resistant to strong acids and bases. Table 5.113. They also exhibit good resistance to hot water. 

PAVE shows very low watc r absorp- Table 3 Chemical Resistance tivity at <0.01%, ind high chemical resistance. No degradation, no weight cliange are observed in contact with strong acid and bases (Table 3). It is not attacked by solvents based on hydrocarbons or ch1orocarbons. But particularly, PAVE is soluble in specific perfluorinated solvents such as perfluorobenzene, perfluorohexane and perfluoroalkylamines (Table 4). It is stable in air to temperatures above 400 C (Fig. 10). 

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