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The Effect of Temperature on Reaction Time.

Measuring the effect of temperature on the rate of a chemical reaction using Alka Seltzer.

Lila Rivera

on 20 December 2013

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Transcript of The Effect of Temperature on Reaction Time.

Lila Pearl Rivera
Period 5

The Effect of Water Temperature on Reaction Time
The main reason why I conducted this experiment was to measure the effect of temperature on the rate of a chemical reaction in Alka-Seltzer.

The main question that is being addressed is which temperature of water will there be a quicker chemical reaction in.

This experiment is worth conducting because this topic interested me.
I am convinced that the hot water will allow the Alka-Seltzer to create a greater chemical reaction much quicker than cold water and room-temperature water. The higher the temperature, the faster the molecules are moving. I hypothesize the it would only take 10-15 seconds for there to be a chemical reaction in hot water. In cold water, I think it would take one minute for there to be a complete chemical reaction. And in room-temperature water, it would take about 35-40 seconds for there to be a chemical reaction.
1. 12 tablets of Alka-Seltzer
2. Thermometer
3. 3 cups of room-temperature water
4. 3 cups of hot water
5. 3 glass beakers
6. A spoon to stir
7. Stopwatch
1. Add 8 oz. (ounces) of cold water to one glass beaker.
2. Add 8 oz. of hot water to another glass beaker.
3. And do the same for room-temperature water inside the last glass beaker.
4. With the thermometer, measure the temperature of water and record it.
5. Also do this for hot water and room-temperature water.
6. After measuring the temperatures of water, ask someone near you to help you with the stopwatch. Once you drop one tablet of Alka-Seltzer in each beaker of the waters simultaneously, start the stopwatch!
7. You will then see the little bubbles of CO2 coming out of the tablet.
8. Next, stir the water gently with the spoon. Do not stir rapidly.
9. Do the same for the hot water and room-temperature water. The tablet will slowly disintegrate.
10. When the Alka-Seltzer tablet has completely dissapeared in either the hot water, cold or room-temperature water and there are no more bubbles left, yell "STOP!" and tell your friend/partner to stop the stopwatch.
11. Record the reaction time.
12. Repeat steps 1-11 three more times.
Results (Graph)
Results (Chart)
My hypothesis was incorrect according the the data and the results of the experiment. But, it was also correct because I stated that the hot water will dissolve the tablet quicker, and it did. My hypothesis was that the the hot water will dissolve the tablet in 10-15 seconds. The room-temperature was would dissolve in 35-40 seconds and the cold water would take 60 seconds to dissolve. It turns out that the hot water only took 8-10 seconds, the room-temperature took 20-23 seconds, and the cold water took ONLY 25-26 seconds.
Alka Seltzer Reaction Alka Seltzer Reaction . (2012, June 20). NEWTON, Ask a Scientist at Argonne National Labs!. Retrieved November 19, 2013, from http://www.newton.dep.anl.gov/askasci/chem03/chem03749.htm

Alka-Seltzer Plus - Student Science Experiments. (2013, November 19). Alka-Seltzer -- Alka Seltzer Plus. Retrieved November 19, 2013, from http://alkaseltzerplus.com/asp/student_experiments.html

What is the chemical formula of alka seltzer. (2013, November 19). The Q&A wiki. Retrieved November 19, 2013, from http://wiki.answers.com/Q/What_is_the_chemical_formula_of_alka_seltzer&altQ=Chemical_formula_for_alka_seltzer
Full transcript