 The project experimented with was based on the amount of carbon dioxide produced at different water temperatures. The initial idea was to determine whether water temperature affected the reaction time of the Alka- Seltzers tablets depending on the carbon dioxide produced as a certain amount of time passed. Carbon dioxide was seen to be the product given off from the Alka-seltzers tablets and were used during the experimentation. In my first attempt , the water level would not go down or decrease, therefore giving a suspicion that the Carbon dioxide gas was escaping through the openings around the hole made on the cap. However I improvised and used a more efficient cap which seemed more effective. During the preparation the cylinder container had to be filled to the top with 250ml of water in the graduated cylinder which was to be placed upside down. Then after placing the plastic tubing into the graduated cylinder. I placed 150 ml of water for each of the different water temperature into the beaker. Afterward the Alka-Seltzer was placed in the water and the cap was shut as I started the timer. The results supported my hypothesis which was the Alka-seltzers dissolved much faster in warmer water temperatures than in colder whereas less carbon dioxide was produced. Since increasing PH balance created by the amount of carbon dioxide depending on temperature of the water. Relieves stomach aches in lesser amount of time.  Many of people most likely have seen commercials about Alka-seltzers advertising that they work instantly in a little amount of time to relief stomach aches. But have you wondered whether the temperature of the liquid taken with it affects the amount of time needed to take effect. If you haven’t noticed, when placing an Alka-Seltzer in a cup of water, it produces bubbles made of carbon dioxide gas. This is why testing the amount of carbon dioxide produced is very important, when changing the temperature of the water and comparing the outcomes.  From this point back in history Alka- Seltzers are used daily by consumers for many different reasons. It’s known as an effervescent antacid which was developed by Treneer in Elkhart Indiana in 1928 to cure America from the common flu when it was launched in 1931 by the Dr. miles Company. The Alka-Seltzer is marketed for relief of minor aches, pains, inflammation, fever, headache, heartburn, sour stomach, indigestion, and hangovers, while neutralizing excess stomach acid. The packaging comes in different flavors, sizes and purposes. The one thing that Alka-seltzers advertising don’t talk about is does the temperature affect the rate of dissolving.  However with Aka-seltzer, the CO2 is produced by a chemical reaction that occurs when tablets dissolve in water. The main ingredients of an Alka- Seltzer tablet are aspirin, citric acid, and sodium bicarbonate (NACHO3). When sodium bicarbonate dissolves in water it dissociates (splits apart) into sodium (NA+) and bicarbonate (HCO3-) ions. The bicarbonate reacts with hydrogen ions (H+) from the citric acid to form carbon dioxide and water. In order for the reaction to occur, the bicarbonate ions have to come into contact with the hydrogen ions. Molecules in a solution are in constant motion, and constantly colliding with one another. The hydrogen and bicarbonate ions must collide at the right angle and with enough energy for the reaction to occur. The temperature of a solution is a measure of the average motion (kinetic energy) of the molecules in the solution. The higher the temperature, the faster the molecules are moving. When comparing the temperatures needed to dissolve the Alka-Seltzer, and timing how long the reaction time takes to complete. The compounds on the left side are known as reactants and the compounds on the right side are called the products. The reaction is described through the following formula: C6H8O7 (aq) + 3NaHCO3 (aq) → 3H2O (l) + 3CO2 (g) + Na3C6H5O7 (aq) Citric acid + sodium bicarbonate → water + carbon dioxide + sodium citrate     There are many scientific theories behind the creation and use of Alka-seltzers related to physicsmotion and force. Many applied to bottle rockets containing Alka-Seltzer and soda which is shaken to produce a high level of carbon dioxide causing it to produce kinetic energy from a chemical reaction. However that is just one theory that many might be really interested in testing out. This is one of the reasons why, Alka-seltzers are one of the many pain reliever (antacid) that we humans use daily and don’t realize reduce symptoms by increasing PH balance created by the amount of carbon dioxide depending on temperature of the water.  The goals and expected outcomes from this experiment are to compare and test the amount of carbon dioxide produced for each of the three different temperature waters. After researching and taking the underlying factors into consideration. I’ve come to think that the warmer the temperature the water is, the more carbon dioxide will be produced during the reaction time, compared to lower temperatures. Since each Alka-Seltzer will be timed every twenty seconds, for two minutes. The faster the Alka-seltzers dissolve the shorter it will take for the carbon dioxide to be released to take in effect after reaction time.   After placing the Alka-Seltzer in the beaker as it was closed sealed the timer was started. While the water level decreased, CO2 increased which filled the graduated cylinder while it was upside down. Therefore every twenty seconds the water level would be measured and recorded afterwards. The calculations necessary to analyze final results for each trial is to subtract the volume of water at the end of the experiment after the reaction time took place. From the 250 ml which is the amount water in the graduated cylinder started with. Then after getting each temperature of the carbon dioxide volume I added the numbers together, and then averaged those by the number of trials performed which in my case would be three. This will be the ending result for the three different water temperatures which will help you find the answer to the problem.               • • • • • • • • • • • • • • Safety Goggles Alka-Seltzer Tablets Thermometer 60 ml Syringe 150 ml-200 ml Graduated Cylinder Plastic Bottle Drill and Nail Aquarium Tubing Measuring cup Permanent marker Hot and cold tap water (Ice) Stopwatch Lab notebook Dishpan                      1) Drill a hole for the aquarium tubing in the center of the cap of the wide-mouth bottle. 2) Wear safety goggles for this step. 3) Mark the location for the hole in the center of the bottle cap. Use a center punch or tap a nail with a hammer to make a small depression at the center location. 4) Carefully drill the hole in the bottle cap. 5) Squeeze one end of the tubing and press it into the hole. Push the tubing through to the other side of the cap. 6) Press the other end of the tubing onto the end of the syringe. 7) You will be collecting carbon dioxide from the Alka-Seltzer® chemical reaction by displacing water trapped in an inverted graduated cylinder. 8) Fill your plastic dishpan (or bucket) about one-third full with water and fill the graduated cylinder with water. 9) Keep the opening of the cylinder under water, turn it upside down and attach it to the side of the dishpan with masking tape. a. The actual volume of the water should be at least 240 ml (8 oz.). 10) Here is how to measure the reaction rate: a. Fill the glass bottle water to the level of the masking tape. b. Measure the temperature of the water, and record it in your lab notebook. c. Remove the thermometer. d. Have the stop watch, while you get ready with an Alka-Seltzer® tablet. Hold the tablet in one hand and the bottle cap in the other hand. e. Start timing when you drop the tablet into the water. f. Quickly cap the bottle tightly. You'll immediately see bubbles of CO2 streaming out from the tablet. G Using the hand that you don't use for writing, swirl the bottle gently, keeping the bottom of the bottle flat on the table top. h. Every ten seconds you should immediately read the carbon dioxide volume (in the syringe or graduated cylinder) and write it down in your lab notebook. 11) For each of the three temperatures, you should repeat the experiment four times, for a total of 12 trials. 12) Make a graph of the volume of CO2, in mL, (y-axis) vs. time after the reaction begins, in seconds (xaxis). http://www.sciencebuddies.org/science-fairprojects/project_ideas/Chem_p026.shtml#procedu 160555_md.jpg Alka-Seltzer-Box.gif Water Temperature Trial # Average Volume per trial Volume of Co2 after timer begins 20 sec 40 sec 60 sec 80 sec 100 sec 120 sec 1 40 ml 83 ml 95 ml 111 ml 123 ml 145 ml 105 ml 2 53 ml 76 ml 92 ml 108 ml 134 ml 152 ml 98 ml 3 48 ml 67 ml 73 ml 89 ml 114 ml 135 ml 115ml 4 36 ml Average Volume Of CO2 64 ml 89 ml 97 ml 102 ml 113 ml 60 degree Celsius 60 degree Celsius 60 degree Celsius 106 ml 30 degree Celsius 130 ml 5 44 ml 59 ml 75 ml 83 ml 106 ml 118 ml 30 degree Celsius 127 ml 6 41 ml 60 ml 78 ml 93 ml 109 ml 121 ml 30 degree Celsius 134 ml Average Volume Of CO2 130.33 ml 7 43 ml 64 ml 87 ml 115 ml 132 ml 148 ml 155 ml 9 degree Celsius 8 55 ml 77 ml 84 ml 106 ml 128 ml 151 ml 164 ml 9 degree Celsius 9 38 ml 59 ml 76 ml 93 ml 114 ml 136 ml 150 ml 9 degree Celsius Average Volume Of CO2 156.33 ml Volume of Carbon Dioxide Produced  In conclusion, my hypothesis indeed was correct which was supported by the results taken from the experiment. During each trial as two AlkaSeltzer tablets were placed in different water temperatures, I noticed that in warmer water temperature the tablets dissolved much faster. Since there was a higher volume of carbon dioxide than in colder water temperature, the tablets took more time to dissolve. While making my observations I came to understand that as the carbon dioxide filled the graduated cylinder the volume of the water decreased as the CO2 increased. Therefore I could take my measurements every twenty seconds to record the difference between water level and the volume of CO2 during the Alka-Seltzer reaction time. After seeing my results, if I were to repeat the experiment again I would have tested the different types of Alka-Seltzer such as generic or brand type names. To determine whether it affected the amount carbon dioxide produced during reaction time. When water temperature was 60 degrees Celsius the volume water difference from the time that it started was lower in each trial. However the lower water temperature volume of CO2 produced was much lower than the room temperature trials which were higher and produced CO2 al lower reaction time. In my experiment I noticed that the Alka-seltzers dissolved much faster in warmer temperature of water.      "Plop, Plop, Fizz Fast: The Effect of Temperature on Reaction Time." Plop, Plop, Fizz Fast: The Effect of Temperature on Reaction Time. Science Buddies, n.d. Web. 22 Sept. 2012. http://www.sciencebuddies.org/science-fairprojects/project_ideas/Chem_p027.shtml "How Fast Does an Alka-SeltzerÂ® Tablet Make Gas?" How Fast Does an Alka-SeltzerÂ® Tablet Make Gas? Science Buddies. n.d. Web. 22 Sept. 2012. http://www.sciencebuddies.org/science-fairprojects/project_ideas/Chem_p026.shtml "Rocketology: Baking Soda Vinegar = Lift Off!" Rocketology: Baking Soda Vinegar = Lift Off! Science Buddies. n.d. Web. 22 Sept. 2012. http://www.sciencebuddies.org/science-fairprojects/project_ideas/Chem_p086.shtml "Everyday Chemistry - How Antacids Work." Everyday Chemistry How Antacids Work. MiracleworX. Web Design India, n.d. Web. 22 Sept. 2012. http://humantouchofchemistry.com/how-antacids-work.htm "Acids, Bases and Neutral Substances." Acids, Bases and Neutral Substances. Intel Young Scientist 2004, n.d. Web. 22 Sept. 2012. http://angel-patti03.tripod.com/id2.html