CHEM 121 Lab 6: Measuring Kc and Shifting Chemical Equilibria (Portage learning)

Experiment # 6 Measuring Kc and Shifting Chemical Equilibria Purpose: To study the equilibrium reaction by 1) determination of the equilibrium constant, Kc. 2) Shift equilibrium, Le Chatelier’s principal. Procedure: A. Measuring Equilibrium Constant 1) Mix 10ml each of acetic acid and n-propyl alcohol in a small flask. Place 1 ml sample of mixture into a beaker using a pipette. Add 25ml of water and several drops of phenolpthalein. Titrate NaOH into beaker. Note color changes and stop titrating when the color change is constant. 2) Add sulfiric acid to the flask with the original mixture. Place 1 ml sample into another beaker and titrate NaOH into beaker until color change is constant. Set aside for 1 hour. Place 1 ml sample into a beaker with distilled water and phenolpthalein indicator. 3) Place the flask with remaining acetic acid, propyl alcohol, and sulfiric acid over a burner with a condenser attachment. Heat for 1 hour. Titrate NaOH until a constant color change appears. 4) To determine Kc, find the concentration of each reactant and product after equilibrium has occurred.