Chemical Reaction Lab Report

I believe that the ½ cup with the Alka seltzer will dissolve quicker than the 1 cup of water. It will have a higher concentration of Alka seltzer to water than the 1 cup.

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.

After analyzing and interpreting the data from the investigation, greater Alka-Seltzer tablet surface area (ex. whole tablet vs powdered tablet) most often led to higher reaction rates, measured in gas displacements (which also increased, refer to Table III). It was hypothesized that if an Alka-Seltzer tablet’s reaction rate is correspondent to its surface area, then gradually maximizing its surface area would consequently increase its rate of reaction, due to an increased number of exposed surface particles available to collide with the tap water, which would lead to a hypothesized 50% faster reaction. The hypothesis was correct to an extent - although the reaction rate did not speed up by 50% through each trial when halving the tablet (refer to Table I), it was proved that increased Alka-Seltzer surface area (by halving the tablet until eighths, then finely crushing the tablet) consequently increased reaction rate (measured in sec, ±0.5sec). This variable was measured through the amount of gas that was displaced during the experiment - which proved to be true as well; as surface area increased, the amount of gas displaced increased as well.

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.

One of our flaws was that the temperature of the water was not exactly the same when we did the different trials. The temperatures were slightly off from our recorded value during the experiments. The change in temperature would affect the time it took for the Alka-Seltzer tablet to dissolve in the water. If there was a direct relationship between water temperature and dissolve time, we would not be able to see it because the temperatures are off and the dissolve times are not associated with the correct temperature. Another flaw is that we did not use the same amount of water throughout the experiment. We used a beaker to measure the water, which did not result in accurate measurements. The difference in amount of water could result in a difference in reaction time. The third flaw in the experiment was that during the reaction of the warm water, the water in the cup overflowed and spilled, bringing some of the Alka-Seltzer tablet with it. There were different amounts of tablet in different areas of the water, which means a different amount of Alka-Seltzer remained inside of the cup in each trial. This difference would mean that data for the warm water would fluctuate and we would not have accurate

Vinegar was used in this experiment to mimic the stomach acid that reacts with the sodium bicarbonate in the Alka-Seltzer tablet. Limiting reactants relate to this lab by the sodium bicarbonate reacting with the stomach acid. Once the stomach acid, vinegar in this lab, was reacted, the sodium bicarbonate no longer was secreted. Increasing amounts of vinegar was added to the tablet to determine a point at which the sodium bicarbonate becomes the limiting

Is this reaction endothermic or exothermic? What does that mean and how do you know? (~3 sentences)

Discussion and Conclusion: 1. I investigated the effects of surface tension and heat on the Alka-Seltzer tablets. There were good factors to observe because both have immense impact on the results of the experiment. 2. I controlled the amount of water in the cups and the amount of CO2 trapped by the balloon.

This experiment can create an endo and exothermic reaction. “The endothermic reaction means that the temperature drops, but it will drop slowly”. An endothermic reaction happens when energy is used to break all of the reactants and break away from every single particle in the substance causing the temperature to drop. An exothermic reaction is when the temperature rises and just like the endothermic reaction it will rise slowly. An exothermic reaction is very similar to an endothermic reaction, but

Therefore, the collision of molecules from the effervescent Alka-Seltzer tablet and water allows carbon dioxide to release from the reaction to create a fizzling

Procedure: A beaker was filled up with water to about 90% of the beaker’s capacity was placed on a hot plate and was continuously heated throughout the entire experiment. 90 mL of potassium iodate and sodium bicarbonate were combined into a large beaker. The initial temperature of each solution was recorded.

Observations: As the liquid water started boiling, the temperature reached up to approximately 100ºC (the maximum temperature), the boiling water started generating a lot of bubbles. As the bubbles were being generated, the glass bead (that was placed inside the beaker) also started shaking rapidly. Explanation (hypothesis) of the bubbles and Chemical equation: The bubbles generated by the boiling water are an example of a gas, or a water vapor forming inside the liquid water (liquid water converted to gas). Based on the chemical equation, H O (liquid water reacting with heat to form gas), we can assume that H and O are the two types of gases.

Introduction This laboratory experiment was performed to show how water changes form when heat is applied or taken away to provide more on the topic of matter. These topics include the points at which water boils, melts and freezes. Prior knowledge on the subject that were applied during the activity included the melting and freezing point of water, 0 degrees celsius, and the boiling point of water which is 100 degrees celsius. It is said that when a substance is in its liquid state, it has more thermal energy than a substance in its solid state, and so on through gas and plasma, that statement was tested today.

Our testable question was, what is the effect of different liquids on the dissolving rate of the alka seltzer. To answer this question we dissolved alka seltzer in three different liquids, and recorded the data we found. After testing water three times

Alka-Seltzer tablets are dissolvable because they contain bicarbonate forms. This is also known as sodium bicarbonate. Bicarbonate contains chemical equity that can make Alka-Seltzer tablets melt. In this chemical substance, it plays a big role. When the bicarbonate salt forms there’s a positively charged that attaches to the negatively-charged oxygen atoms that form an ionic mixture.