Dilution and Color Change Experiment (1)

Dilution and Color Change Experiment (1) - Studio Chemistry...

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Studio Chemistry Fall 2007 Color Changes though Dilution? 1 Question : Can a solution change color when you dilute it with water? Hypothesis: 1) Reflecting on you experiences with colored solutions (e.g., food coloring, copper sulfate demonstration, etc) what happens when you dilute a colored solution with water? 2) Can you think of a way it would be chemically possible for a color change to take place through dilution? Experiment: You will need ~65 mL of the 1.8 x10 -4 M bromocresol green (BCG) stock solution. Carry out a series of 9 dilutions. Add 0.50, 1.00, 1.50, 2.50, 4.50, 5.10, 6.00, 6.30 and 7.50 mL aliquots of stock solution to separate 10 mL volumetric flasks. Dilute to the mark. (You will probably need to transfer your solutions to 10 mL or other small volume beakers or flasks as your prepare them. Be sure to rinse your volumetric flasks with 3-4 SMALL aliquots of DI water before reusing them. 3) Record your observations. 1 Silva, C.R.; Pereira, R. B.; Sabadini, E. J. Chem. Educ . 2001 , 78, 7, 939-940.
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Studio Chemistry Fall 2007 4) Calculate the concentration of BCG in each solution. (Do you have your data organized in a table?) 5) Propose a model (a reasonable explanation) of the BCG system to explain your observations.
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Dilution and Color Change Experiment (1) - Studio Chemistry...

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