Sodium, crystal structure dissociation

Reaction of B20(0Ac)4 with sodium acetate results in the formation of Na[B20(0Ac)5] with O and OAc bridges, whereas acetatoborates, M[B(OAc)4] (M = K, Rb, Cs, Tl), are obtained when the reaction is conducted in the presence of acetic anhydride. These borates are easily hydrolyzed in the case of [B(OAc)4]- the rate determining step seems to be dissociation of the complex. Binuclear "borates M2[B20(0Ac)6] and M2[B202(0Ac)4], were detected, inter alia, during thermal decomposition of tetraacetatoborates.132 The crystal structure of K[B(OAc)4] has been determined.133... 

Dissolving sodium chloride destroys its crystal structure and frees the Na" and CD ions which can then disperse through the body of the water. This process is called ionic dissociation. The ions are loosely attracted to the surrounding water molecules and are said to be hydrated. We represent this by aq , an abbreviation for aqueous which means watery. In our example we write Na" (aq) and Cl (aq). The sum of the dissociation and hydration steps is called dissolution. The dissolution maybe summarized by the equation ... 

---