The purpose of this lab is to see if changing the temperature and the surface area affects the speed of the solute dissolving. This lab relate to the things you have been learning in class because it connects to solubility and how the change in temperature, surface area, and concentration affects the rate in which a substance dissolves. In this lab we hypothesize if we increase the temperature of the vinegar, then the speed of the Alka-Seltzer would increase as well because the speed of the molecules breaking down will be faster. If we also increased the surface area of the Alka-seltzer, it will also dissolve quickly because the pieces are little. In order to complete the surface area experiment, we put our safety goggles on to prevent any …show more content…
damage in our eyes and then opened the packet of Alka-Seltzer. Second, we kept one whole tablet and crush the second tablet into a powder. We then pour 5 mL of vinegar into the canister and dropped one tablet of Alka-Seltzer. Quickly, we closed the lid and measured the time of how long the lid took to pop off. Then, we recorded our data and did the same steps for the crushed Alka-Seltzer tablet. To make sure our data is accurate, we tested these steps three times with the whole and crushed Alka-Seltzer tablet separately. To conduct the temperature experiment, we opened the packet of Alka-Seltzer and kept the tablets as they are. Second, we pour 5 mL of vinegar into a beaker then heated up on a hot plate. With a thermometer, we made sure that the temperature of the vinegar reach 70 degrees celsius. Quickly we poured the heated vinegar into the canister with a tablet of Alka-Seltzer inside, and closed the lid. While closing the lid, we quickly timed how long it took for the lid to pop out. Then, we did the same steps without heating up the 5 ml of vinegar. We recorded that with a larger surface area and higher temperature, the Alka-Seltzer dissolves very quickly than with a whole tablet and a cooler temperature.
This data indicates that with a bigger surface area, it took 16 seconds for the cap to pop off, whereas with an normal Alka-Seltzer it took 8 seconds. As a result of the time, we determined that with a bigger surface area, the speed of the solute dissolving increases. Another data indicates that with a higher temperature, it took 4 seconds for the cap to pop off, whereas with a cooler temperature it took 10 seconds. As a result, we determined that with a higher temperature, the speed of the solute dissolving also increases. These results do make sense because with a bigger surface area, the crushed tablet of Alka-Seltzer dissolve quickly because the vinegar molecules break down the Alka-Seltzer molecules easily than when the tablet is a solid. The other result do make sense because with a higher temperature, the molecules move faster, thus speeding up the process to break down a solute easily. One source of error may have been is that we could’ve put more vinegar in the canister when conducting the experiment. This error would have affected our data because if the seconds were wrong, then that can lead us to having the wrong time for each experiment, resulting we could have longer time than expected. To summarize, the pop rockets experiment helped us determine that with a bigger surface area, the solute has a higher
solubility that a smaller surface area. Also, the higher the temperature, the solute has a higher solubility than a lower temperature. We determined that with a higher surface area and temperature, it's more likely that the solute has a higher solubility. This lab makes me wonder if we ate a bigger surface area food, would it take us faster to break it down than a smaller sized food?
Extraction is a separation method that is often used in the laboratory to separate one or more components from a mixture. Sucrose was separated at the beginning because it is the most immiscible and it’s strongly insoluble. Next Acetylsalicylic Acid was separated which left Acetanilide alone. Variety steps could have led to errors occurring. For example the step of separation, when dichloromethane layer was supposed to be drained out, it could be possible some aqueous layer was drained with it. Which could make the end result not as accurate. Also errors could have occurred if possibly some dichloromethane was not drained out. Both way could interfere with end result of figuring the amount of each component in the mixture. The solids percentage were 22.1% more than the original. That suggests that solids weren’t separated completely which clarifies the reason the melting points that were recorded were a slightly lower than the actual component’s melting point. The melting point for Acetylsalicylic Acid is 136 C but that range that was recorded during the experiment was around 105 C to 118 C. The melting points were slightly lower than the literature value. Sucrose was the purest among all component due to its higher melting point which follows the chemical rule that the higher the melting point the more pure the component
Anne Zhang 3/6/14 BSGE 7-1 Lab Report Problem Paragraph 1 Question: What is the effect of temperature on the dissolving time of an Alka-Seltzer? Alka-Seltzer is made up of baking soda, aspirin, and citric acid which gives the tablet the fizz when dropped in any temperature water. “Alka-Seltzer is a medication that works as a pain reliever and an antacid.
In undertaking the experiment, the hypothesis “if the number of Alka Seltzer tablets reacted increases, then the maximum rate of reaction will increase,” was formed. When graphing the relationship between the maximum rate of reaction and the number of Alka Seltzer tablets reacting, Graph 7 produced a line of best fit with a constant increasing slope that passed through the origin (0,0). This is characteristic of linear graphs, which have the general equation, y=mx, where m is the slope, a constant term, and y and x are changing variables that are directly proportional (i.e. y ∝x). Hence, it can be deduced that Graph 7 is a linear graph, and that there is a linear relationship between the maximum rate of reaction and the number of Alka Seltzer tablets, where they are directly proportional. That is, as the number of Alka Seltzer tablets increased, the maximum rate of reaction increased, supporting the hypothesis. As the true value of the maximum rate of reaction per Alka Seltzer tablet was not known, and a value for comparison was unavailable, the accuracy of the results could not be determined. However, due to the scatter in Graphs 2 to 7, it was evident that the results had low precision. In future, repeating the experiment using different and/or new apparatus will aid in detecting systematic errors and improve the accuracy and validity of the results.
This is because there are more water molecules in a given volume to react with the Alka-Seltzer tablets. However if there are sufficient water molecules to occupy the Alka-Seltzer tablets an increase in the water molecules will not alter the rate of the reaction. This is because the Alka-Seltzer tablets are already working as fast as they can to react with the water. The concentration can be increased by increasing the volume of the water used in the reaction to dissolve the Alka-Seltzer tablets in. To control the... ...
Alka Seltzer Dissolving at Different Temperatures. The variable that I will change will be the temperature of the water. that the Alka Seltzer is put in. For my results I will measure the time taken for the Alka seltzer.
Thorough analysis of the graph displayed enough evidence suggesting that an increase in substrate concentration will increase the height of bubbles until it reaches the optimum amount of substrate concentration, resulting in a plateau in the graphs (figure 2). Hence; supported the hypothesis.
Regarding the densities of Coke and Diet Coke, I believed that the density of coke would be greater than the density of Diet Coke. Because the content of Coke contains more sugar than Diet Coke, it would contain more mass and since density is mass dependent, Coke would be denser than Diet Coke. From the results of the experiment, there was a slight difference between the densities of Coke and Diet Coke. The measurements obtained from the pipette and the graduated cylinder demonstrated that Coke is denser than Diet Coke while Diet Coke was shown to be denser than Coke using the burette. With the pipette, the average density of Coke is 1.02 and the average density of Diet Coke is 0.99. With the graduated cylinder, the average density is 0.976968 and the average density of Diet Coke is 0.95. With the burette, the average density of Coke is 0.99 and the average density of Diet Coke is 1.0. Among the three instruments, the most precise was the graduated cylinder and the most accurate was the volumetric pipette. Since density is defined as mass/volume, changing the volume of Coke or Diet Coke would have changed.
In a more concentrated solution, collision occurs more often because there are more molecules. The more often these molecules collide, the greater the chance they having of reacting. This means that the rate of a chemical reaction will increase if the concentration of reactants is increased. However, in this experiment, I'm going to do an investigation to find out how amylase concentration affects the rate of starch Hypothesis:
I blended on high to make the potatoes more liquid-like. I grabbed the cheesecloth and placed on the top of the blender. I poured the potato extract on the container and labeled it. I found out that I have to make 1% sugar solution so I grabbed the sugar and measured into 5 grams on the scale. I added 5 grams of sugar on 250 ml graduated cylinder and poured the water into the cylinder. I mixed the sugar with water and poured it into the saucepan. I refilled the water into the graduated cylinder and poured into the saucepan. I turned on the heat of the stove and saw the sugar dissolved. I poured into a container and labeled 1% sugar solution. I repeated the same thing with 1% salt solution by using 1 gram of salt and filled the water into graduated cylinder by 100 ml. I answered question three. In the first experiment, I grabbed four transfer pipets and used it to put solutions into the test tubes by 3ml. I labeled it and placed into the plastic cups so it can stand upright. I grabbed each test tube and poured 2 ml of catalase solution into it. I also tapped and swirled to measure the bubbles by using the ruler. I wrote the numbers into the lab report. In the second experiment, I labeled the room
Methodology: A plastic cup was filled half way with crushed ice and mixed with four spoonfuls of 5 mL of sodium chloride. A thermometer was quickly placed inside the cup to take the temperature and the
If the concentration of sucrose increases, then the mass of the potato will decrease. However, if the concentration of the solution in the beaker is less than that of the potato (such as distilled water), then the mass of the potato will increase. So, as the concentration of sucrose increases the rate of osmosis increases.
The purpose of the lab was to show the effect of temperature on the rate of
Our task was to investigate what the optimum ratio of solute to solvent that will produce the maximum cooling/heating effect?
borate) and 1.0 g. of sodium hydroxide in 20 mL of warm water. It may
In experiment 5, we are learning about density and specific gravity in measurements. Density is measured by mass divided by volume in order to get the ratio of the mass of an object to its volume. Specific gravity, on the other hand, is the density of a substance divided by the density of water and will cancel out the units in order to get a unitless measurement. Mass and Volume can be measured in two different ways, first mass can be calculated by directly placing it on the triple beam scale directly, or by weighing the difference. Volume can be calculated by displacement in the graduated cylinder or by calculating its dimensions. In this experiment, the objectives were to calculate the density of a solid by measuring its mass and volume,