Lab 19a Investigating Chemical Equilibrium

Lab 19A: Investigating Chemical Equilibrium

Purpose:

        To observe shifts in equilibrium concentrations when stresses such as temperature changes are applied through recognizing macroscopic properties of chemical systems and being able to explain the results using Le Chatelier's principle.

Materials:

        Please see page 209 of the “Heath Lab Manual.”

Note: Changes made to the materials/procedure include the optional use of microplates for parts 4 and 5, 250mL Erlenmeyer flasks for parts 1 and 2, 100mL graduated cylindres for part 3, and 10mL graduated cylindres for measuring.

Procedure:

        Please see pages 209-212 of the “Heath Lab Manual.”

Note: Changes made to the materials/procedure include the optional use of microplates for parts 4 and 5, 250mL Erlenmeyer flasks for parts 1 and 2, 100mL graduated cylindres for part 3, and 10mL graduated cylindres for measuring.

Data and Observations:

Table #1: Equilibrium Involving Thymol Blue

Table #2: Equilibrium Involving Thiocyanatoiron (III) Ion

Table #3: Equilibrium Involving Cobalt (II) Complexes

Table #4: Equilibrium Involving Chromate and Dichromate Ions

Table #5: Equilibrium Involving Copper (II) Complexes