3. The arrangement of particles demonstrated in the box on the right is called a hydration shell. In effect the copper metal becomes a complex ion with its surrounding water molecules. For metals other than group I and II, some water molecules are ripped apart due to their close association with the ions resulting in some H ions ending up in solution. This process can be expressed in the reaction shown below and can be called hydrolysis. What does the double arrow shown in the reaction tell us about the completion of the reaction, and what is actually found in the beaker: reactants, products, or both? (1) Cu(H₂O)6^2+ [Cu(H₂O)5(OH)]^+ + H+

The term reaction has to do with an interaction between reactants to give products. Sometimes, there is only a single reactant as we can see in the equation written as follows; [tex][Cu(H_{2} O)_{6} ]^{2+} ------- > [Cu(H_{2} O)_{5} (OH^-)]^+ + H^+[/tex]

In this case, a hydrogen ion leaves one of the water ligands to yield the species on the left hand side of the reaction equation. The double arrow in the reaction implies that this is a reversible reaction. A reversible reaction is one that could go either forward or backwards.

In a state of dynamic equilibrium, we always have the reactants and the products in the beaker. This is because, reactants are being converted to products and products to reactant at the same rate.

Hence in the beaker, we would find both reactants and products.

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