Virtual Experiment 29

Equilibrium Constant of a Reaction

This lab was performed by Dr A. Sullivan. The videos below can be used to record your observations and data for Experiment 29 laboratory assignment.

The assignments that need to be completed are:

Complete the pre laboratory writing assignment
Complete the pre laboratory problems
Use the following videos and the data sheet to complete the formal laboratory report for this experiment

Virtual Experiment 29

Experiment 29

Pre laboratory assignments

Complete the pre laboratory writing assignment in your laboratory notebook. The prewriting must be completed before the laboratory session begins. The writing should include a purpose/hypothesis of the experiment, a discussion or theory, a detailed step by step summary of the procedure explaining what data will be collected and how you will collect it. Data Tables or space to collect the data should be included within the procedure discussion. Look up any SDS on chemicals that you are not familiar.

Attempt the pre laboratory problems either as the document provided in the experiment or as the laboratory quiz in canvas before coming to the class meeting.

Experiment 29 Pre laboratory problems

Procedure

Solutions containing potassium thiocyanate (KSCN) and Iron (III) nitrate, Fe(NO3)3 will be created of specific concentration to create a Beer's Law plot of the absorbance of Fe(SCN)2+. These concentrations will be determined from the limited iron (III) solutions. The Beer's law plot will be used to determine the concentration of solution of KSN with iron (III) in equilibrium to calculate the equilibrium constant for the reaction. In the last part of the experiment, the reaction will be stressed to produce a shift in the reaction..

V-EXP 29Class Data sheet

Part I: Beer's Law Constant Determination

Use the following videos to complete the calculations and Beer's Law plot for this experiment. The data sheet to create the Beer's Law plot for the Absorption and concentration data for the A solutions.

Lab 29 Calculations of A solutions.mp4

This video shows the calculation of the concentration for all solution used in this experiment

Lab 29 Calibration with A solutions.mp4

This video shows the A solutions and the development of the Beer's Law plot and the A solutions

A picture of the A solutions.

LAB 29 SPECTRUM.pdf

This is the absorption spectrum for solution 7B which is representative of all solutions.

Part II: Determination of Kc

Use the following videos to collect the absorbance and concentration data for the seven trials used to determine the equilibrium constant for the reaction.

Lab 29 B Solutions.mp4

This video shows the B solutions for the determination of the equilibrium constant

Lab 29 C solutions.mp4

This video shows the C solutions and the Le Chatelier's Principle

Part III: Le Chatelier’s Principle

Use the following video to collect the absorbance and concentration data for the six trials to understand Le Chatelier's Principle.

Lab 29 explanation and calculations.mp4

This video explains the calculations and requirements to complete the calculations and graphs for lab 29

A picture of the C solutions.

Jason Goudie - Support Chemisode: https://www.paypal.me/goudiejason/5

An example of equilibrium changes involving the Iron Thiocyanate equation.

Formal Report and Conclusion Paragraph

Complete the formal report and conclusion paragraph using the RERUNS method. A discussion of how to prepare the formal report and a conclusion paragraph is given in Appendix D: How to Write a Formal Laboratory Report

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