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Alka Seltzer Lab Report

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Claire Niewiara

on 15 March 2014

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Transcript of Alka Seltzer Lab Report

Alka-Seltzer Lab Report
5.) A stopwatch is prepared to time the duration of time it takes for the tablet to completely dissolve in the water. When the desired temperature is achieved, a piece of tablet (1/4 or 1/2) is dropped into the beaker. The solution is stirred, and the timer is then started.

6.) The solution is continuously stirred until the piece of alka-seltzer tablet has completely dissolved. The timer is stopped at that point.

7.) The data is recorded in the table for that trial, and steps 2-6 are repeated until the required amount of trials are completed.

8.) When the trials are completed, the beakers need to be rinsed and dried, and any other pieces of lab equipment are to be returned to their original locations.

¼ tablet & temperature
½ & ¼ tablets & temperature
½ tablet and temperature
Independent/Dependent Variables

-reaction time

-size of tablets (per set of trials)
-amount of water
-continuous stirring
If the temperature is raised, then the reaction rate of the alka-seltzer tablet dissolving in water will increase, and if the tablet size is smaller then the reaction rate will also increase, as there isn't as much substance to dissolve due to the amount of surface area coming into contact with the.
Data Table
Presentation By:
Trial # Amount of Water (ml) Temperature (°C) Tablet Size Reaction Time (min:sec)
1 100 ml 0.2 ¼ 3:52.46
2 100 ml 4.9 ¼ 3:29.11
3 100 ml 15.2 ¼ 1:25.38
4 100 ml 21.5 ¼ 45.1
5 100 ml 32.5 ¼ 28.2
6 100 ml 41.1 ¼ 18.3
7 100 ml 46.0 ¼ 16.7
8 100 ml 57.1 ¼ 14.46
9 100 ml 75.1 ¼ 11.1

10 100 ml 0.4 ½ 3:53.44
11 100 ml 5.1 ½

12 100 ml 21.0 ½ 48.83
13 100 ml 55.1 ½ 15.54

Carli York
Claire Niewiara
Anna Kaplan
Connor Murphy
Katelyn Kolosieke
Kate Odell
1.) 2 Alka-Seltzer tablets are broken into fourths and the other 2 are broken into halves

2.) For each trial, 100mL water (or water and ice depending on desired temperature) are placed in beaker

3.) If a hot temperature is wanted, beaker filled with water is placed onto a hot plate, and heat until the desired temperature is reached (determined by measuring with a thermometer).

4.) If a cold temperature is wanted, ice cubes are added until the water becomes cold enough. Again, done by measuring the temperature with a thermometer.

Procedure (continued)
The results of the experiment supported the hypothesis that the reaction rate would increase as the temperature increased and the tablet size decreased, and achieved the purpose of the lab which was to determine the relationship between the independent and dependent variables. As the temperature was increased for both sizes of tablets, the reaction time tended to decrease, increasing the reaction rate. In relation to the 1/4 tablet, the time dropped from 3:52.46 min:sec to 11.1 seconds, and from 3:53.54 to 15.54 for the 1/2 tablet as the temperatures increased from about 0°C to 75 °C. This is due to the increase of speed in the water particles as the temperature was raised, raising the amount of collisions and therefore leading to the tablet dissolving at a faster rate. The opposite is true when the temperature was lowered. The reaction rate showed more of an increase in the 1/4 tablet than the 1/2 tablet, as shown by the trends of a faster reaction time in that 1/4 tablet and temperature graph than that of the 1/2 tablet at relatively the same temperatures. This is due to there being less of the substance to dissolve in the 1/4 tablet, so there needs to be less collisions between the seltzer particles and those of the water in order for the 1/4 tablet to be dissolved and more for the 1/2 piece.
Possible Sources of Error
Although there were no major outliers (only one slight deviation for the 1/2 tablet for 5.1°C) in the trials that were run, errors are still highly probable. Some sources of error include human error of not being able to obtain precise measurements for the reaction time, due to the delay between the time the person observes the reaction ending and the time it takes to end the stopwatch. This would not have majorly affected the data, and the general trend would have stayed the same. An additional source of error would be misreading the temperature or the volume of liquid in the beakers. This would have resulted in either an increase or decrease of reaction times for the recorded temperatures depending on which mistake occurred and the extent to which the measurements were misread.
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