The purpose of this experiment was to determine the amount of water in Epsom Salt and determine whether the amount of water is equal to the theoretical value, when the chemical formula is MgSO4・7 H2O. To check the amount of water in epsom salt, 3g of epsom salt in each crucible 1, 2, and 3 were heated on 495℃. While the epsom salt was heated, white water vapor came out from the crucibles and disappeared in the air. According to the Table 1, as the epsom salt were heated, the mass keep decreased and when those were heated 5th and 6th times, 50 minutes and 60 minutes, there were no significant change in mass. From the Table 2, the leftover amount of anhydrous epsom salt in each crucibles were equal. There were 1.46g of MgSO4 in the crucible after the last heating and 1.54g of H2O was vaporized. Since the result of each trials are same, the standard deviation shows up as 0. By using the molar mass of each compound, MgSO4 got 0.0121mol and H2O got 0.0855mol, which the ratio of MgSO4 and H2O is 1:7.07. The mol ratio shows that when there are one MgSO4, there are 7 H2O. According to the chemical formula of epsom salt, which is MgSO4・7 H2O, the experiment shows that the experiment and the theoretical values are almost same. The random errors of the mass and mol for MgSO4 and H2O are 1.3699% and …show more content…
After measuring the mass of three trials before restarting the experiment, the mass increased about 0.05g. Based on this, we could know that epsom salt could gain water easily from air when it is on the air. This is because the epsom salt is inorganic hydrate. Inorganic hydrate could simply lose water by heat, but also could gain water and try to go back before it was heated if there are no heat. This could change the result of the experiment if the crucibles are cooled for long time because if the epsom salt bound water again, the mass could be
the replicate shows the same trend as the first experiment. I used a measuring cylinder and a beaker to measure out the amounts of water; however these did not seem to affect the quality of my results. To increase the accuracy of my results I could have perhaps used a burette. Even though I did the best I could to keep the experiment accurate, I did. some places there were mistakes that unintentionally occurred.
The researcher conducting this experiment is trying to find out which salt- Epsom, table salt, and sea salt- will increase the boiling point of water the most. Sodium chloride is believed to increase the boiling point of water because when salt is suspended into the water, the sodium and chlorine ions leave the “salt crystals” and mix with the water molecules. (“Why does salt… raise boiling point of water?”, 2009).
Osmosis Experiment Planning Aim: The main subject that I will be planning to investigate is the effects of a concentrated sucrose solution on potato cells on the basis of the Osmosis theory. Background knowledge: The plant cell and its structure To understand osmosis in detail I will need to explain the plant cell (which is the cell included in the osmosis experiment) and its cell membrane. Below I have a diagram of a plant cell: [IMAGE] Osmosis is about the movement of particles from a higher concentrated solution to a lower concentrated solution to create an ethical balance via a partially or semi permeable cell membrane. Osmosis in simple terms is the exchange of particles between the cytoplasm inside the cell and the solution outside the cell. What makes this exhange is the partially permable cell membrane.
In addition, the water is mixed with salt, which allows the cold pack to stay cool. The mixture that occurs between the salt and the water causes an endothermic reaction, which means that heat is absorbed. Due to the heat absorption, the temperature of the solution will decrease substantially. The cold pack experiment lab allowed us, the students, to apply theories learned in class to actual real life experiments; such experiments prepare us for future tasks the will be put forth to determine. Our main trajectory through this assignment was to determine what our unknown salt was, through experimental analysis.
The experiment is aimed at giving a better understatement of osmosis process and the different conditions in which osmosis occurs.
The hypothesis for this experiment was, If three different types of waters (saltwater, fresh water, tap water) are tested, then the liquids won’t evaporate at the same rate and tap water will evaporate at the fastest rate because it won’t have any non-volatile substances to hold it back from evaporating.
The hypothesis that was formed in this experiment was that decantation and distillation were the techniques that would be successful in separating the three layered substances. The oil on top of the mixture was to be decanted solely, and the salt and sand layers would be distilled and separated together on filter paper on top of boiling hot water. The reason that the oil is decanted is because it doesn’t mingle with the salt and sand layers, and in addition it was the top layer, which was thought to have been easy to separate first. And as for the sand and salt, sand doesn’t mix and dissolve in water compared to salt, which does in fact dissolve, so distillation was thought to be the proper solution to separating the two
Investigating The Effect Of Concentration Of Salt Solution On The Mass Of Potato Chips Aim: The aim of this investigation is to see whether the amount of salt solution affects the mass of the potato chip Hypothesis: In the solution below, water will diffuse from the dilute solution into the concentrated solution through the process of osmosis. Therefore the dilute solution level will fall and the concentrated level will rise Line Callout 2: Disapproved (is unable to go through the semi permeable membrane O Line Callout 2: Approved (is able to go through the semi permeable membrane P Salt solution Water [IMAGE] When a substance such as salt dissolves in water, the substance's molecules stick with some of the water molecules, so the concentration of the water molecules decreases. When the water molecules are the same concentration on both sides of a semi permeable membrane and salt is dissolved into one of them, osmosis will occur as shown in the diagram below.
One possible source of experimental error could be not having a solid measurement of magnesium hydroxide nor citric acid. This is because we were told to measure out between 5.6g-5.8g for magnesium hydroxide and 14g-21g for citric acid. If accuracy measures how closely a measured value is to the accepted value and or true value, then accuracy may not have been an aspect that was achieved in this lab. Therefore, not having a solid precise measurement and accurate measurement was another source of experimental error.
We were assigned a group and instructed to measure the amount of different ions in that particular fertilizer sample by counting to preform tests. We used the formula SO4 + Agent —> Percipitat + others. Our job was to add 0.25 g of a fertilizer sample to 100 mL of water to dissolve, then add the agent Pb(NO2)3 to the water also, then filter and dry the water, and distinguish the mass. The was accomplished by using the % formula Mass SO4 = Mass Pb(NO3)2 x MW Pb(NO3)2/ MWPb(NO3)2 to gain the percentage, the the formula Mass SO4/MW SO4 =
First, the freezing point depression of magnesium chloride was found. To begin, an ice bath was created in a 600 mL beaker filled with ice provided in the laboratory and rock salt. Next, Four different solutions with concentrations of 0.0 g (control), 0.2 g, 0.4 g, and 0.6g of magnesium chloride and 15 mL of deionized water were created. Each solution was made in a 100 mL beaker. The solutions containing magnesium chloride were stirred with a glass rod until the salt was completely dissolved. All equipment was cleaned with deionized water to minimize cross contamination. To calculate the freezing point, a Vernier temperature probe provided in the laboratory was used. The temperature probe was plugged into the GoLink!
Moisture is heavy, and thus it can change the results of the experiment, as we only want the weight of magnesium and the magnesium oxide.
To test this, we set up two experiments. The first experiment we set up had three cups. In each cup a potato slice and a different liquid was put in. In the first cup was filled with distilled water. The second cup was filled with salt water and the third was left empty.
The sand is The variables in this experiment were Volume and Temperature. So as to make this a fair experiment, care was taken to ensure that the beaker. was rinsed every time, and that the thermometer was in the room. temperature, so as not to yield any anomalous results. All the results will be taken on the same day, so that the room temperature does not differ, as this could affect the results also. My Hypothesis: My hypothesis is that the temperature of the water will decrease as the volume increases.
The Effect of Salt Solution Concentration On The Mass Of Potatoes Introduction = == == == ==