The purpose of this lab was to learn how to determine the percent of water in a hydrate.…
You and your partner will perform two trials of dehydration of a copper (II) sulfate hydrate.…
The purpose of the experiment was to find the percent of water in Epsom salts by heating it. To find the percent of water in a hydrate, the hydrate must be heated. The experiment did not only show how dehydration occurs, but this experiment also gives an accurate and definite portrayal of the amount of water that is removed…
Then from this number the amount of water that was in lost was measured at 1.1 g. After this then the number of moles of anhydrous were calculated from the molar mass of anhydrous. Then the moles of water were calculated. Then the stoichiometric coefficients for each component were calculated. The results found that there was two moles of anhydrous and 35 for water. Thus the empirical formula was found to be:…
In the first process of the lab, you measure the mass of water transferred from a buret to a beaker, to determine the experimental mass of the water, and the volume of the water collected. We measured the temperature of the water so we could calculate the density of the water, which enabled us to calculate the actual volume of water, by using the density and the measured volume of water. To determine the percent error, we had to subtract the actual volume of water by the experimental volume of water transferred from the buret to the beaker, and then divided it by the actual volume and multiplied it by 100. In the second process, you perform the same steps you did for the buret, but instead, you use a 5.00mL or 10.00mL pipet. You repeated each…
A sample of copper sulfate pentahydrate (6.285g) was weighed out. The copper sulfate pentahydrate was dissolved in water (11.99mL) in a 250mL beaker. The solution was heated on a hot plate to 90 degrees Celsius. A sample of potassium oxalate monohydrate (10.006g) was dissolved in water (50.0mL).…
2 mL of dichloromethane was added to the test tube and then stirred for two minutes. The test tube was then centrifuged for 30 seconds making sure that another test tube equal in volume was placed across from it. A micro pipet removed the liquid above the solid after the test tube was done being centrifuged. The decantate was dispensed into the previously weighed watch glass. The previous steps were then repeated two more times. The watch glass with the decantate was placed to the back of the mini hood so the solvent could evaporate. After half of the solvent was evaporated, the watch glass was then moved to the drying oven. Once the solvent was completely evaporated and cooled, it was weighed and recorded.…
Calculations: Mass of crucible with hydrate (32.35g) - Mass of crucible and anhydrous salt (31.39g) = .96g…
Determine the water of hydration in a copper chloride hydrate sample. Conduct a reaction between a solution of copper chloride and solid aluminum. Use the results of the reaction to determine the mass and moles of Cu and Cl in the reaction. • Calculate the empirical formula of the copper chloride compound.…
The percent of any compound or element can be found by using a certain formula. This formula is: % of element = Mass of element or compound/Total mass of compound x100. In order to use this formula the mass of the water and the total mass of the hydrate had to be found. The lab workers…
A hydrate is a substance that holds water in a certain ratio. As Hydrates are compounds with constant composition, we were able to easily determine this ratio by evaporating the water and then calculating a common ratio. We had Copper sulfate pentahydrous. In our experiment and on further calculations we observed that generally ten molecules of water combine with one molecule of…
The purpose of the Formula of an Unknown Hydrate lab is to determine the weight percentage of H2O hydrated to an unknown salt and the empirical formula for the hydrated salt. To do this, a massed amount of the hydrate is heated over either a hot plate or Bunsen burner. This causes the water to be removed, leaving the anhydrous salt behind in the dish. The mass of the anhydrous salt, now with the absence of water, is less than the original mass of the hydrate. The difference between the two is the mass of the water removed from the hydrate. As shown in data table 1, the mass of the anhydrous salt is 2.66 grams, and the mass of the water removed is .51 grams. The water of hydration was calculated to be about 2. Based on these measurements, the empirical formula of the hydrate is BaCl2 • 2H2O. This means that for every mole of BaCl2, there is about two moles of water. The weight percentage of water to hydrate is about14.75%. This means that in the total mass of BaCl2 • 2H2O, water makes up about 14.75%.…
(1) Metric ruler with centimeter (cm) and millimeter (mm), (1) table salt, (1) small number of ice cubes, (1) piece of string, (1) isopropyl (rubbing) alcohol, (1) tap water, (1) distilled water, 25 mL, (1) paper, 5 cm x 5 cm for weighing chemicals, (1) colored drink, (1) beaker, 100 mL, glass (1) burner-fuel, (1) burner-stand, (1) cylinder, 25 mL, (1) 23-mL volumetric flask, (1) Pipet, Serological 2mL, (1) Bulb, Rubber (1) Goggles-Saftey, (1) Scale-Digital-500g, (1) Test Tube (1), 13 x 100 mm, (1) Thermometer, (1) Bolt, (1) Magnet bar, (1) Pipet, Empty Short Stem…
3. Procedure: In order to perform this lab I needed the following materials: a metric ruler, table salt, small number of ice cubes, piece of string, flame source, rubbing alcohol, tap water, distilled water, paper, colored liquid drink, 100mL glass beaker, burner-fuel, burner-stand, 25 mL cylinder, 25mL volumetric flask, 2mL pipet, rubber bulb, goggles, 500g digital scale, test tube measuring 13x100mm, thermometer, small bolt, magnet bar, and an empty short stem pipet. To start off this lab assignment I measured the length of three objects in centimeters and millimeters with a metric ruler. I measured a knife, lighter, and a standard pack of UNO cards. I recorded the data. Next, I measured the temperature of hot water, boiling water, and boiling water after 5 minutes in Celsius. Then I proceeded to measure the temperature of cold water, ice water, and ice water after 5 minutes. I recorded this data. For this I used my 100mL beaker and hot water. I then used the wire gauze burner stand and the fuel burner in order to bring the water to boil. I measure the temperatures with my thermometer. I then let the beaker cool and measure cold water from the tap and then added ice cubes to the water in order to measure ice water’s temperature with the thermometer. Next, I measure the volume of a test tube by filling the test tube with water and pouring the water into my 25mL graduated cylinder. I recorded this volume. I then filled the pipet with one mL of water and counted how many drops were inside the pipet. I recorded this data. After doing so I…
The mass percent of water was determined using the mass of water and dividing it by the total mass of the hydrate and then multiplying that answer by 100%. The number of moles of water in a hydrate was determined by taking the mass of the water released and dividing it by the molar mass of water. The number of moles of water and the number of moles of the hydrate was used to calculate the ratio of moles of water to moles of the sample. This ratio was then used to write the new and balanced equation of the dehydration process. The sample was then rehydrated to the original state and the percent of the hydrate recovered was calculated by using the mass of the rehydrated sample by the mass of the original hydrate and then multiplied by 100%.…