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chemkineticsprelab - color • Procedure 1 Making...

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Steven Hagedon Danielle Nguyen, Ashley Cox, Grishma Sheth Yan Zhao Chem 104B Jan-28-08 Section 027 “Chemical Kinetics” Pre-Lab Report With using household bleach, the problem proposed is to find the rate, the frequency of molecular collisions within a chemical reaction, of a reaction between a common household bleach and a coloring dye o We will use the Red Dye #40 – Allura Red The rate of a chemical reaction is defined as rate= d[product]/d t =-d[reactant]/d t . However, “Since the overall reaction does not describe the rate-determining step, rate laws can not be predicted from overall reaction equations” (Brown 146). Therefore, in order to determine the rate-determining step of the reaction, the rate of the reaction between the bleach and the dye must be measured by use of different concentrations at different time intervals. The chemist will know when the reaction is done due to the bleaching of the dye, or the removal of all
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Unformatted text preview: color. • Procedure 1. Making concentrations of the stock bleach and stock dye solution to make sure the reactions occur within the right amount of time a. To do this, mix 1 mL of bleach with 99 mL of H 2 O in one container and 1 mL of dye with 99 mL of H 2 O. Repeat this step until there is 4 mL of bleach with 96 mL of H 2 O and 4 mL of dye with 96 mL of H 2 O. 2. Mix the diluted sodium hypochlorite with the diluted dye in a beaker. Fill a cuvette with this solution and measure the absorbance and time on the spectrometer. 3. Reintegrate the cuvette liquid with the beaker solution, stir and refill the cuvette. Plot the data observed on a graph of absorbance vs. time. 4. Repeat steps 2 and 3 for each of the four trials until the reaction is complete, which is when there is no color left from the dye. • Table of Data : Concentration Volumes Times Trial #1 Trial #2 Trial #3 Trial #4 Trial #5...
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