solutions and as the reaction proceeded a colored he the dye Assume the reaction

Question

solutions and as the reaction proceeded a colored he the dye Assume the reaction used in this exercise began with two colorless olution was produced that absorbed light at the wavelength you used to monitor the decolorization of t solution. What happens as the reaction proceeds? How will this change the appearance of the straight line plot used to determine the rate order? Explain your answers. 4. affect your interpretation of the results? Would this 5. The half-life of a reaction is defined as the time required for one-half of the reactant toa he ron results for the nseudo-first ordo

Explanation / Answer

The original experiment studied the decolorization of a sample of dye due to a particular reaction. The decolorization of the dye was measured by spectrophotometry. As the reaction proceeded, the dye sample was decolorized and hence, the absorbance of the dye will decrease with time. The concentration of the dye at the end of the reaction (or at a stipulated time after the reaction was started) should have been much lower than the starting concentration (since absorbance of the solution is directly proportional to the concentration of the solution).

If a competing reaction produced a colored substance which absorbed at the same wavelength as the dye, then the absorbance will increase instead of decreasing. The straight line will show a slight decrease followed by an increase. The increase occurs since more of the competing reaction takes place, producing the colored substance. The correct concentration of the dye at the end of the reaction (or after a fixed time period) can never be determined accurately.

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