DATE LAB SECTION ENERCISE 16 NAME QUESTIONS 1. Should the calculated value of th
ID: 1032340 • Letter: D
Question
DATE LAB SECTION ENERCISE 16 NAME QUESTIONS 1. Should the calculated value of the equilibrium constant in each of the trials above be the same? Explain. These experiments were done at room temperature,-25°C If the experiment were done with all solutions consistently at 50°C, would the results be different? Explain. 2· 3. Would it be possible to run this experiment using a colorimeter that measured absorbance at 800 nm? Explain. 4. Imagine that the unprotonated form of the dye, BB, did not absorb light, but that the spectrum of HBB did not change. How would you perform this experiment differently, and how would the analysis change?Explanation / Answer
For the given experiment,
1. The equilibrium constant values for all the trials is expected to be the same as equilibrium constant is dependent upon the ratio of product to reactant at equilibrium and not the exact conceontrations of each in the solution.
2. If the reaction is done at 50 oC instead of -25 oC, the results would be different. The rate of product formation increases greatly at higher temperature and thus the product to reactant ratio would be much greater in this case. This gives higher value for the equilibrium constant for all the trials.
3. It would not be possible to run the expeirment in caloirmeter at 800 nm as the wavelength maxima does not matches with this value. We would not get correct absorbance results and the error will be high in the experimental results.
4. In this case, the wavelength maxima is adjusted to the absorbance value for the unprotonated dye HBB. the experiment is done by observing the absorbance values at this particular wavelength and the values are only dependent upon HBB concentration in solution and not on BB-.
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