Water, acid-base behavior hydrogen bond

The major biological solvent is water, and the acid-base behavior of dissolved molecules is intimately linked with the dissociation of water. Water is a weak electrolyte capable of dissociating to a proton and a hydroxyl ion. In this process, the proton binds to an adjacent water molecule to which it is hydrogen-bonded (Chap. 4) to form a hydronium ion (H30+) ... 

Why do we use the terms acid and base in this context Recall from Section J that acids and bases are normally discussed in terms of the behavior of a hydrogen ion, H+ (a proton), and that, in water, an acid such as HC1 donates its proton to a neighboring water molecule. We could imagine this reaction as taking place in two hypothetical steps first, an HC1 molecule releases a hydrogen ion as soon as it dissolves in water and then that hydrogen ion immediately bonds to a neighboring water molecule. The second step is... 

A hydrophobic surface is one that repels water, whereas a hydrophilic surface attracts water. But there is a wide range of surface behavior most surfaces are neither fully hydrophilic nor absolutely hydrophobic. One of the main determinants of the overall hydrophobicity of a sample is the extent to which the functimial groups oti the surface of the material interact with water. These interactions include intermolecular forces (dipole-dipole interactions and hydrogen bonds), as well as acid/base chemistiy and other types of surface reactions involving water. Water will readily wet a hydrophilic surface (see Figure 3.3A), but will bead up on a hydrophobic surface (Figure 3.3B). 

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