Alka Seltzer Experiment

Introduction: Alka-seltzer contains three active ingredients, aspirin, sodium hydrogen carbonate and citric acid. It is used for headaches, migraines, and cold and flu symptoms. Alka-Seltzer is usually taken when dissolved in a glass of water. When placed in water a series of chemical reactions result into Sodium citrate and Sodium acetylsalicylate. The sodium citrate would act as the antacid for stomach pains, and the sodium acetylsalicylate would act as the pain reliever.

How does the dissolve rate of the Alka-Seltzer tablets change as the temperature of the water changes? The dissolve rate is being affected by the temperature of the water. Temperature is a measure of kinetic energy in molecules (NYU). The higher the temperature, the higher the kinetic energy. Energy is required to create a reaction. Molecules with more energy come into contact with each other more often. The molecules of the reactants have to come into contact with each other, so more energy in molecules result in faster dissolving time.

3. When the anhydrous sample was rehydrated, only 93.4% of the sample could be recovered. This was because some of the mass of the sample remained stuck to the filter paper and could not be measured in the final mass calculation. This automatically resulted in less mass and did not allow for 100% of the mass to be recovered.

The first two questions will be answered during the introduction of the lesson and the rest will be the laboratory analysis questions. These will get the students to analyze and make sense of their lab results.

On average the Alka Seltzer tablet dissolved faster in hot water in comparison to ice cold water and room temperature water. The beaker with ice cold water caused the Alka Seltzer tablet to dissolve the slowest. The three beakers containing different temperatures of water, all produced carbon dioxide bubbles; however, the beaker containing hot water produced the bubbles more rapidly.

Alka Seltzer is a medical drug used for pain relief and used for relieving indigestion. For example, if you have a stomachache or some indigestion problems, Alka Seltzer may help neutralize the stomach acidity. Not only that, Alka Seltzer is also used for cleaning household items, such as vases or jewelry. Alka Seltzer contains citric acid and sodium bicarbonate, which makes it dissolve and release carbon dioxide gas when dropped in water. In this experiment, my lab partner, Rebecca, and I are trying to find a way to make Alka Seltzer dissolve faster in water. Rebecca and I both decide that if we increase the temperature of the water or make the water hotter, then the Alka Seltzer will dissolve faster because I know when salt and sugar dissolve in hot water, they dissolve faster. I predict that this same result would apply to this experiment.

My hypothesis is that if I lose the weight of CO2 in Alka Seltzer then I will be able to determine the percent of sodium bicarbonate in the Alka Seltzer. This is because

Based on the results of your experiment, would you reject or accept the hypothesis that you produced in question 1? Explain how you determined this.

b. As I mentioned above that I spilled some of the benzoic acid therefore the initial mass

In my lab,we observed various chemicals and their reaction to water.Their reactions were mostly that they just dissolved with the water,causing the water to turn white.However, some of their reactions were more interesting.One of the more interesting reactions was baking soda.At first the baking soda was chunky yet power like.When water was added however, it turned the water white, and caused it caused the water to bubble.The bubbles started off small, but soon grew in size. After the bubbles died down, there was a small sizzle, and the bubbles sank to the bottom of the specimen tray.The baking soda and a really cool reaction, and I must admit, I popped some of the bubbles with the paperclip. Something that did go wrong was that one of my

One of the ways to speed up the reaction is to agitate it. You can either to do this by shaking the solution or by stirring it. When you shake it, you should careful that none of the solution comes out the beaker. To prevent this you should put your hand over the beaker. If you decide to stir the solution, make sure that it isn’t made of a transition metal because it will change the reaction completely.

The results obtained clearly prove the hypothesis stated as the average rate of reaction of the chalk and acid increased as the temperature changed from iced water, to room temperature, to boiling water. The average rate of reaction in seconds in room temperature water was 57.34, this decreased to 68.93 seconds when the chalk was placed in iced water and then when placed in boiling water there was a dramatic increase in the rate of reaction to 23.77 seconds.

The purpose of this experiment was to determine the sugar (glucose) content in the egg and how different solutions affected the mass of the eggs, my hypotheses is the higher level of glucose the eggs sit in the solution will continue to rise and become hypertonic. In this experiment it called for 4 eggs and placed them in beakers. One was filled with ¾ of water, one with 0.5 glucose, 1.5 M glucose and the last was 2.0 M glucose. The eggs were weighed in the beginning and then every 15 minutes for an hour, recording the mass of the egg. With the numbers recorded the percent change in mass was calculated. Once this was completed and looked over I found my hypothesis to be wrong. The egg was tested in 2.0 M glucose started out with a mass of 93.5M

* This was troublesome, since the cool water was used to reduce the heat of the reaction.

Compute for the increase in the gravitational potential energy of the mass for each trial using these equation: PE=mgh.