All cuvettes should be wiped clean and dry on the outside with a tissue. See Step 2 of the procedure for the volume of each substance used in Trials Obtain about 25 mL of distilled water in a mL beaker. Leave the wavelength knob of the colorimeter set to the Blue LED position Essayons ffc the remainder of the experiment.
To correctly use a colorimeter cuvette, remember: Wipe the outside of the cuvette with a tissue and then place the cuvette in the colorimeter.
Fe NO3 3 solutions in this experiment are prepared in 1. Once the reading has stabilized, press on the CBL to store the absorbance value. Set up the calculator and CBL for the colorimeter. Place the blank cuvette in the cuvette slot of the colorimeter and close the lid. Set up the calculator and CBL for data collection.
Use a pipet pump or bulb to pipet all solutions. Obtain and wear goggles. Calculate Kc for Trials The percent transmittance reading is displayed on the screen of the CBL. Be sure to clean and dry the stirring rod after each mixing. Follow the procedure in Step 9 to find and store the absorbance of this solution.
This should be the same for all four test tubes. You are now ready to calibrate the colorimeter. Repeat the Step 10 procedure to find the absorbance of the solutions in Test Tubes 3, 4, and 5 the standard solution.
Using your four calculated Kc values, determine an average value for Kc. Write the Kc expression for the reaction in the Data and Calculation table. Enter "1" as the channel number.
Firmly press in the cable ends. Be sure to show the Kc expression and the values substituted in for each of these calculations. Volumes added to each test tube are summarized below: All solutions should be free of bubbles.Chemical Equilibrium.
Chemical Equilibrium: Finding a Constant, K c. The purpose of this lab is to experimentally determine the equilibrium constant, K c, for the following chemical reaction.
When Fe 3+ and SCN-are combined, equilibrium is established between these two ions and the FeSCN 2+ ion. In order to calculate K c for the reaction, it is necessary to know the concentrations of all ions.
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