CHM 1142 Lecture 4: Chapter 4 -Reactions in Aqueous Solutions
Document Summary
Solutions are de ned as homogeneous mixtures of two or more pure substances. When water is the solvent the solution is called an aqueous solution. Substances can dissolve in water by different ways. Ionic compounds dissolve by dissociation, where water surrounds the separated ions. Molecular compounds interact with water, but most do not dissociate. Some molecular substances react with water when they dissolve. Electrolyte is a substance that dissociates into ions when dissolved in water. A non-electrolyte may dissolve in water, but it does not dissociate into ions when it does so. A list of solubility rules is used to decide what combination of ions will dissolve. When two solutions containing solubles salts are mixed sometimes an insoluble salt will be produced. Methasis comes from a greek word that means to transpose. It appears as though the ions in the reactant compounds exchange or transpose ions as seen in the equation. Agno3(aq) + kcl (aq) agcl(s) + kno3(aq)
