Factor Effecting Reaction Rates

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Abstract
We performed two trials of nine different variables of reactions to determine what increases/decreases reaction rates. The variables we used are hot/cold and room temperature water, a equal mixture of HCL and water, A equal mixture of NaOH and water, either a whole, broken, or finely crushed Alka-seltzer tablet. The fastest rate average was at 0.04 s (finely crushed Alka-seltzer with room temp. water). The slowest rate average is 8.02 s (Alka-seltzer with cold water).

Introduction
The theory of this experiment is to determine what factors or variables affect the rate of a reaction. In this case we used Alka-Seltzer; the reaction is a neutralization reaction of sodium bicarbonate, citric acid and aspirin. The experiment ran through two trials with nine different steps. We used different variables such as warm/cold water, surface area and an acid and base to slow or speed up reaction rates. Procedure

For safety we wore goggles, gloves and an apron. We used waste jars for the acid/base solutions. We performed two trials and nine different variable reactions. Every reaction had taken place in a film canister. The different variables consisted of mixing hot/cold water and an Alka-seltzer tablet. Room temperature water and a Alka-seltzer tablet. A broken up Alka-seltzer tablet with room temperature water. A finely crushed up Alka-seltzer tablet with room temperature water. Equal parts HCl and water with an Alka-seltzer tablet. Lastly, equal parts NaOH and water with an Alka-seltzer tablet. All reactions occurred in a clean film canister and were timed using a stop watch by the same person every time. We thoroughly cleaned the film canister before each reaction took place. Results

We ran nine different steps through different variables. The different variables are room temperature water which produced a moderately slow reaction rate at 3.94 s for trial 1 and 3.13 s for trial 2. Cold water at 10 ͦc (trial 1) and 5 ͦc (trial 2) produced the slowest rate of reaction performed at 5.63 s for trial 1 and 10.40 s for trial 2 ( this reaction was not a result of a timing error…..the Alka-seltzer tablet must have been defective…..another trial should have been performed but was not). Warm water at 47 ͦc (trial 1) and 51 ͦc (trial 2) produced a very fast reaction rate at .31 s for trial 1 and .11 for trial 2. We slightly crushed a Alka-seltzer tablet and with room temperature water the reaction was slightly quicker than the reaction of the whole tablet with room temperature water at 2.28 s (Trial 1) and 1.88 s (trial 2). We then fully crushed a Alka-seltzer tablet and added room temperature water and the result was the fastest reaction rate at 0.05 s for trial 1 and 0.03 s for trial 2. Finally, not lastly we mixed equal parts HCl acid and water and added this to an Alka-seltzer tablet and the result was moderate at 2.66 s for trial 1 and 1.88 s for trial 2. Lastly, we mixed equal parts NaOH and water and added this to an Alka-seltzer tablet and the reaction was very slow at 4.62 s for trial 1 and 4.25 s for trial 2. See accompanying table for all data

Calculations
The fastest rate average was at 0.04 s for experiment step 6 in data chart (finely crushed Alka-seltzer with room temp. water). The slowest rate average is 8.02 s for experiment step 2 in data chart (Alka-seltzer with cold water).

Discussion
The data shows that a finely crushed Alka-seltzer tablet mixed with water creates the fastest reaction rate. This must be due to the surface area that is created when crushing the tablet. This larger area of exposed Alka-seltzer mixes with the water quicker creating a faster reaction. The second fastest reaction was that of Alka-seltzer and warm water. This is due to the neat ability that is created when temperature is added to a element (in this case water) its molecules are moving faster, bouncing off of each other creating a faster reaction when exposed to Alka-seltzer. The slowest...
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