Lab Report > Chandler-Gilbert Community College - SLC 201Equilibrium Lab-2

Chandler-Gilbert Community College - SLC 201 Equilibrium Lab-2 Equilibrium Lab Report Instructions: For this investigative phenomenon, you will observe the changes that result when you add more of, or take away ...

Chandler-Gilbert Community College - SLC 201 Equilibrium Lab-2 Equilibrium Lab Report Instructions: For this investigative phenomenon, you will observe the changes that result when you add more of, or take away some of, one of the components of the equilibrium (known as a stress) and determine if there are trends in the behavior of equilibrium systems. Record your observation in the lab report below. You will submit your completed report. Title: Equilibrium Lab Objective(s): Observe the changes that result when you add more of, or take away some of one of the components of the equilibrium and determine if there are trends in the behavior of equilibrium systems. Hypothesis: Explain the relationship between forward and reverse reactions at equilibrium and predict how changing the amount of a reactant or product (creating a stress) will affect that relationship. If the amount of reactant increases, the rate of the forward reaction will increase to reach a new equilibrium. If the amount of product decreases, the rate of the reverse reaction will decrease to reach a new equilibrium. Procedure: Access the virtual lab and complete the inquiry experiment. List your controlled variables, independent variable, and dependent variable. Explain why these are the variables. Summarize the steps of the experimental procedure. Materials: Equilibrium Virtual Lab Variables: Remember, controlled variables are factors that remain the same throughout the experiment. An independent (test) variable changes so that the experimenter can see the effect on other variables. The dependent (outcome) variable will change in response to the test variable. Controlled variables: Amount of liquid in each test beaker, the stirring rod, amount of solution added each time. Independent variable: Amount and type of solution added to the test tubes Dependent variable: The stress dded to the system Summary of Steps: Include a summary of steps here. We have included the first two important steps to get you started. You can summarize the rest from the virtual lab. Write down the equilibrium equation you are investigating using the information provided by the introduction within the virtual lab activity Equilibrium reaction: Co(H2O)6^2+ + 4Cl- —> CoCl4^2- + 6H2O Select each control test tube to compare the concentrations of reactants and products. Write down what each indicator color means about the concentrations of reactants and products in solution. Pink means: There is significantly more Co(H2O)6^2+ than CoCl4^2- in the test tube. Blue means: There is significantly more CoCl4^2- than Co(H2O)6^2+ in the test tube. Purple means: The amounts of Co(H2O)6^2+ and CoCl4^2- are about equal in the test tube. First you add a solution of HCI to the first test tube and stir with a dry stirring rod, then record the stress added to the system, the change in color to the solution and the graph. Then add a solution of AgNO3 to test tube 1 and repeat the same process. Then add liquid H2O to test tube 2 and repeat the same recording process. Next add NaCl salt to test tube 3 and repeat the same recordings. Next, add liquid H2O to test tube 3 since the salt has dissolved and record again. Finally, take the solution in test tube 2 and add solid CaCl2 and again record observations. Data: For each trial, make sure you record the initial color of the solution, what is added to the test tube (a description of the stress), and what happened after the substance was added. Also include a screen shot, sketch, or description of each graph of each trial.