Rate Law Lab Report

Finding the rate law was the overall goal of the laboratory. When finding the wavelength of the Azo Orange II dye, the highest wave was the point used, 483nm. The plotted points of the different concentrations absorbance’s made sense to have a steady upward slope because the dye was diluted in steady increments from full to ¾ and so on. Beer’s law was used next to calculate the absorbance of they time over time as bleach was added. One the absorbance value was calculated, the concentrations were able to be determined also using Beer’s law. From here the rate constant was able to be calculated for each concentration and the average was 0.599M/s. Overall, the Rate Law=0.14[dye]1[bleach]0. Trends in the date show when concentrations of the dye and bleach were at their fullest, the rate constant was lower and the change in absorbance, change in concentration, and rate of the reaction were all slightly higher than when the dye was full and the bleach was diluted. The highest data was shown when the dye was diluted and the bleach was full, which was because the dye was less concentrated meaning the bleach will
Also, incorrect measurements and calculations of the concentrations when the bleach and dye were diluted could be slightly incorrect. Finally, a last limitation could be the accuracy of the spectrometer since the cuvette was smaller and the light could have been worn out. Sources of error include the bleach concentration may have been too high. When the bleach concentration is at its fullest, the rate increases making the slope very steep and hard to evaluate. An error may result from these steep slopes because the change in time is very small. Another source of error could possibly be contaminated equipment as well as mixing up solutions of bleach. Lastly for sources of error, the surface tension in the small cuvette could lead to inaccurate volume