A Hydrated Ion in Solution

The Chemistry of Art > 5. Complexes > A Hydrated Ion in Solution >

Explain what is meant by a hydrated ion in solution

  • When an ionic compound dissolves in water
    • Ions dissociate
    • Ions are surrounded by water molecules
  • These ions are said to be hydrated
  • They are represented by
    • Mn+
    • Xy-
  • Water molecules orient themselves so that
    • Their positively charged end (the hydrogen’s) faces the anions
    • Their negatively charged end (The oxygen) faces the cations
  • This process is hydration
  • Many cations are surrounded by a fixed number of tightly bound water molecules
    • g Fe3+ is surrounded by six water molecules and becomes [Fe(H2O)6]3+
    • The charge on the complex remains unchanged