Lab Report for Chemical Equilibrium - Laboratory Write-up for Chemical Equilibrium Chemistry 112 Lab Section 115 A Research Question 1 What is the Kc

Lab Report for Chemical Equilibrium - Laboratory Write-up...

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Laboratory Write-up for Chemical Equilibrium Chemistry 112 Lab Section 115 October 29, 2014 A.Research Question1.What is the Kc for the reaction at room temperature?2.What is the sign of the ΔH for the reaction?3.What are the effects of adding/removing reactants to/from the equilibrium mixture? B. Observations and Results Table 1. Equilibrium Constant Determination Test tube [Fe 3+ ] I (M) [SCN - ] I (M) [Fe 3+ ] eq (M) [SCN - ] eq (M) [FeSCN 2+ ] eq (M) K c 1 0.001 0.0004 8.70 x 10 -4 2.70 x 10 -4 1.30 x 10 -4 553 2 0.001 0.006 8.60 x 10 -4 4.60 x 10 -4 1.40 x 10 -4 354 3 0.001 0.0008 8.44 x 10 -4 6.44 x 10 -4 1.56 x 10 -4 287 4 0.001 0.001 8.19 x 10 -4 8.19 x 10 -4 1.81 x 10 -4 270 Table 2. Le Chatelier’s Principle Observations. Effect A 470 (indicate ↑ or ↓) Change in [FeSCN 2+ ] (indicate ↑ or ↓) Adding heat energy Removing heat energy Adding Fe(NO 3 ) 3 Adding EDTA C. Claim Make a claim about each of the following: - The K c for the reaction at room temperature - The sign of the ΔH for the reaction - The effects of adding/removing reactants to/from the equilibrium mixture 1. The K c for the reaction at room temperature is 366. 2. The sign of the ΔH for the reaction is negative. 3. Adding reactants to the equilibrium mixture shifts the equilibrium to the right and removing reactants shifts the equilibrium to the left.

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