Fescn2 В Equilbrium - Lechatelier's Principle Lab Part 1 -

According to Le Châtelier, if a stress (change in concentration or temperature) is applied to this system, the equilibrium will shift to counteract that change. Chemicals: (Iron(III) nitrate), (Potassium thiocyanate), Na2HPO4cap N a sub 2 cap H cap P cap O sub 4 AgNO3cap A g cap N cap O sub 3 (for removing ions), distilled water.

Below is a structured template for a formal lab paper based on standard chemistry practices. Title: The Effect of Concentration and Temperature on the Equilibrium Date: [Insert Date] Name: [Your Name] 1. Introduction

was prepared and divided into test tubes. Each tube was subjected to a specific stress (adding more Fe3+cap F e raised to the 3 plus power SCN−cap S cap C cap N raised to the negative power , adding a reagent to remove Fe3+cap F e raised to the 3 plus power FeSCN2 В Equilbrium - LeChatelier's Principle Lab Part 1

The purpose of this experiment is to observe how a chemical system at equilibrium responds to various disturbances, as predicted by . The specific system studied is the formation of the iron(III) thiocyanate complex ion:

Fe3+(aq)+SCN−(aq)⇌FeSCN2+(aq)+heatcap F e raised to the 3 plus power open paren a q close paren plus cap S cap C cap N raised to the negative power open paren a q close paren is in equilibrium with cap F e cap S cap C cap N raised to the 2 plus power open paren a q close paren plus heat (Yellow) + (Colorless) ⇌is in equilibrium with (Dark Red/Brown) According to Le Châtelier, if a stress (change

, or changing temperature) and compared to a reference tube. Use a table to clearly record what you saw. Stress Applied Observed Color Change Direction of Shift Add Darker red-brown Right (toward products) Add KSCNcap K cap S cap C cap N Darker red-brown Right (toward products) Add Na2HPO4cap N a sub 2 cap H cap P cap O sub 4 AgNO3cap A g cap N cap O sub 3 Color fades/becomes yellow Left (toward reactants) Increase Temp (Heat) Color fades Left (exothermic reaction) Decrease Temp (Ice) Darker red-brown Le Chatelier Lab ANSWERS: Fe3+ and FeSCN2+ Equilibrium

6 test tubes, test tube rack, ice bath, hot water bath. Procedure: A stock solution of FeSCN2+cap F e cap S cap C cap N raised to the 2 plus power Title: The Effect of Concentration and Temperature on

To write your lab report for the experiment, you should focus on how external "stresses"—like concentration or temperature—shift the balance between the reactants and the reddish-brown product.