Purpose: The purpose of this experiment is to evaluate and study the equilibrium by measuring

1 Chemistry Notebook

Name:

Date:

Experiment #: 2

Title: Equilibrium Reactions

Purpose: The purpose of this experiment is to evaluate and study the equilibrium by measuring the equilibrium constant.

Procedure:

We performed 2 different experiments:

• Determination of the equilibrium constant Kc
• Study of LeChatelier’s principle

Experiment #1: acetic acid vs. propyl alcohol

• Summary: After gathering supplies, we created a solution of acetic acid and propyl

alcohol in a small flask. At various time intervals, we then took samples of the solution, while titrating sodium hydroxide to determine how much acetic acid continues to be present in the solution.

• Place 10.0 mL acetic acid and 10.0 mL propyl alcohol in a small flask. A 1.0 mL sample

was obtained from the flask and placed in a beaker with approx. 25 mL of H2O.

• We then titrated with sodium hydroxide from a burette.
• As we titrated, we observed for a pink color change in the beaker. We continued to titrate

until the pink color was permanent. However, once the color stayed longer, we slowed to titration, so we didn’t go past the point of change.

• We added a total of 17.1 mL of 0.508 M NaOH.
• We then took the flask of acetic acid and propyl alcohol and added sulfuric acid which

acts as the catalyst. After mixing, we obtained another 1.0 mL sample from the flask and placed it in the beaker to continue with another titration. We anticipated this to take a higher amount of NaOH to change the color of the solution to pink.

• We added a total of 17.5 mL of 0.508 M NaOH.
• We allowed the reflux mixture to sit for an hour before continuing.
• Then, we placed a mixture of acetic acid and propyl alcohol with and sulfuric acid as the

catalyst in a beaker. We heated this mixture for an hour with a Bunsen burner to encourage the reaction to take place, but any vapors produced will go back into the flask because of the reflux condenser used, with the goal that nothing will be lost.

• We then determined the amount of NaOH needed to neutralize the acetic acid in the

beaker by titrating NaOH again until a pink color solution was achieved.

• We added a total of 8.2 mL of 0.508 M NaOH.
• Next, we determined the value of Kc as below in the calculations section of the report.

Experiment #2:

• After gathering supplies, we created a solution using Iron3

+ (yellow) & 6 thocyanate ion (colorless) combine to form thiocyanate ions (reddish/brown)

• / 1